New Compression Options in MongoDB 3.0 | MongoDB Blog

[N] Tensorflow 2.3.0 Released!

There is also a new experimental tf.data API for saving and loading datasets(https://www.tensorflow.org/versions/r2.3/api_docs/python/tf/data/experimental/save)
https://github.com/tensorflow/tensorflow/commit/4d58a67a9f19ab8d0cfbb2d8e461ebb73ce06db6
https://github.com/tensorflow/tensorflow/issues/38483#issuecomment-640963109

https://github.com/tensorflow/tensorflow/releases/tag/v2.3.0

Release 2.3.0

Major Features and Improvements


In addition checkout the detailed guide for analyzing input pipeline performance with TF Profiler.

Breaking Changes


Known Caveats


Bug Fixes and Other Changes

TF Core:


tf.data:


tf.distribute:


tf.keras:


tf.lite:


Packaging Support


Profiler


TPU Enhancements


Tracing and Debugging


XLA Support


submitted by IIIBlueberry to MachineLearning [link] [comments]

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C. (1986). A standardized machine-readable phonetic notation. In Conference Publication No. 258. International Conference on Speech Input / Output; Techniques and Applications, 24–26 March 1986. London: Institute of Electrical Engineers, 134–137.(self) 4 [Book] (BRILL) Indian Diaspora: Voices of the Diasporic Elders in Five Countries(self) 1 [BOOK] 'Hegel, freedom, and modernity' by Merold Westphal, 1992(self) 1 [Supplement] Panza MJ, Graupensperger S, Agans JP, Doré I, Vella SA, Evans MB. Adolescent sport participation and symptoms of anxiety and depression: a systematic review and meta-analysis. Journal of sport and exercise psychology. 2020 May 21;42(3):201-18.(self) 2 [Article] Cooley at al. (2019). 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ERA - Edinburgh(self) 3 [Article] belated: interruption(self) 4 [Article] Reusable and Recyclable Graphene Masks with Outstanding Superhydrophobic and Photothermal Performances(self) 8 [Article] Randomized Algorithms in Number Theory(self) 4 [Book] The Routledge Companion to Digital Humanities and Art History(self) 5 [Article] Regulatory cell therapy in kidney transplantation (The ONE Study): a harmonised design and analysis of seven non-randomised, single-arm, phase 1/2A trials by Sawitzki et al.(self) 0 1 [Book] Asian Freedoms: The Idea of Freedom in East and Southeast Asia (Cambridge), eds. David Kelly & Anthony Reid(self) 2 [Article] Local Mitochondrial ATP Production Regulates Endothelial Fatty Acid Uptake and Transport, by A. Ibrahim N. Yucel B. Kim Z. Arany(self) 4 [Chapter] Modeling Liquid–Liquid Extraction for Critical Elements Separations: An overview, (Chukwunwike O. Iloeje, 2020).(self) 6 [Article] Electrical stimulation in white oyster mushroom (Pleurotus florida) production, by I. Roshita, K. M. P. Nurfazira, C. Shi Fern, and M. S. Nur Ain(self) 1 [Book] Screen Adaptation: Impure Cinema by Deborah Cartmell and Imelda Whelehan(self) 4 [Book] Earth’s Insights (Callicott 1997)(self) 1 [Book] Viscosity of Pure Organic Liquids and Binary Liquid Mixtures 2017(self) 2 [BOOK] Needed: A comprehensive etymological dictionary of the Hebrew language for readers of English(self) 1 [Book] Hydrothermal chemistry of zeolites(self) 5 [Chapter] 2 chapters from A History of the United States Author: Philip Jenkins 3. Expansion and Crisis, 1825–65 6. Expansion and Crisis, 1825–65(self) 4 [Chapter] 8. The Fall of Actually Existing Socialism Authors: Prof. Geoffrey Swain, Dr. Nigel Swain(self) 5 [article] Sci-Hub didn't work for this article so I hope someone could help me !(self) 4 [Book] Evil Men, James Dawes(self) 1 [Chapter] from the book The Versailles Settlement Peacemaking after the First World War, 1919-1923 by Alan Sharp chapter 2. The Paris Peace Conference chapter 3. The League of Nations(self) 2 [Book] Macroeconomics(self) 1 [Article] "Eleutherna, the Orthi Petra Necropolis: Slewn by the Iron" by Nicholas Chr. Stampolidis.(self) 3 [Book] Contemporary Linguistics(self) 4 [Article](http://www.eurekaselect.com/137993/article)(self) 1 [Article](http://www.eurekaselect.com/137993/article)(self) 3 [Book] Chemistry: An Introduction to General, Organic, and Biological Chemistry(self) 1 [BOOK] Mastering Chemistry eBook(self) 3 [Book] The Oxford Handbook of Sovereign Wealth Funds(self) 1 [Book] "Marx, Marxism and Utopia" by Darren Webb (2000)(self) 5 [Article] "Law and Society", by Joachim J. Savelsberg, Lara L. Cleveland, in Oxford Bibliographies in Sociology(self) 2 [BOOK] Encouraging Pro-Environmental Behaviour - What Works, What Doesn't, and Why (2019)(self) 1 [BOOK] ''Guide for the economic design of circular metal silos'' by J.M. Rotter(self) 3 [BooK](JSTOR) The Evolved Apprentice: How Evolution Made Humans Unique by Kim Sterelny(self) 13 [Article] Matthews, Graham 2020 Pandemic, recession...: Capitalism is a Sick System. Green Left Weekly 1257, 2020.(self) 1 [BOOK]A comprehensive etymological dictionary of the Hebrew language for readers of English(self) 1 [Article] Sound Levels in Nursing Homes by Laura L. Joosse(self) 1 [Book] China Upside Down: Currency, Society, and Ideologies, 1808–1856 by Man-houng Lin(self) 3 [Book] The SAGE Handbook of Propaganda (2019)(self) 1 [BOOK] 'Lacan and Religion', by Aron Dunlap, Routledge, 2016(self) 2 [Book] Making It in the Market: Richard Ney's Low-Risk System for Stock Market Investors(self) 1 [Book] Comprendre les langues romanes(self) 1 [book] Derecho romano clásico, Betancourt(self) 6 [Book] The Oxford Handbook of Information Structure (2016)(self) 1 [book] pls help me find Physiotherapy in mental health and psychiatry(self) 4 [Article] Denationalization by Sir John Fischer Williams(self) 1 [BOOK] Statistical Methods for the Social and Behavioural Sciences - A Model-Based Approach (David B. Flora)(self) 1 [ARTICLE] Care as a Political Concept by Joan C. Tronto(self) 1 [Chapter] Agnieszka Uberman "English and Polish figurative language employing components of the frame of death" Cognitive Linguistics in the Year 2017. Peter Lang(self) 1 [book] Petroleum Contracts and International Law by Rudolf Dolzer(self) 1 [Book] A Short History of Persian Literature At the Bahmanī, the ‘Ādilshāhī and the Qutbshāhī Courts – Deccan(self) 4 [Book] A Japanese Advertising Agency: An Anthropology of Media and Markets (Routledge) by Brian Moeran(self) 1 [Book] The Way of Synthesis: Evolution of Design and Methods for Natural Products(self) 1 [book] ما في القرآن الكريم - دراسة نحوية(self) 6 [Book] (JSTOR) First Peoples in a New World: Colonizing Ice Age America by David J. Meltzer(self)
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setting parent / replica (read only) replication and the mysql DB on new servers

I'm following the instructions here: https://mariadb.com/kb/en/setting-up-replication/ and want to get some feedback on what I'm missing.
I have 2 brand spanking new server. No databases outside of the 'mysql' database. I have run 'mysql_secure_installation' on both. The only other commands I've run are creating the replication user and setting the parent on the replica and stop / start replica mode.
parent is set with:
#mariadb server id server_id=1 #binary logging options log_bin = /data/db/mysqllogs/mysql-bin # binary logging format - mixed recommended binlog_format = mixed 
replica has a different server_id and log_bin is disabled. I've tried with both copying the 'mysql' database and without. I've wiped the whole DB config multiple times. I'm at a loss as to why replication isn't "setting up". I'm using GTID mode.
CHANGE MASTER TO MASTER_HOST='MYHOST', MASTER_USER='mariadb_replication', MASTER_PASSWORD='PASSWORD', MASTER_PORT=3306, MASTER_USE_GTID = slave_pos; 
mysql error on the parent states:
2020-07-06 23:56:48 24 [Warning] Aborted connection 24 to db: 'unconnected' user: 'mariadb_replication' host: 'ip-192-168-220-93.us-east-2.compute.internal' (A slave with the same server_uuid/server_id as this slave has...) 
mysql error on the replica states when just doing enable replication:
2020-07-06 23:56:15 10 [ERROR] Slave SQL: Error 'Duplicate entry 'localhost-mariadb.sys' for key 'PRIMARY'' on query. Default database: 'mysql'. Query: 'INSERT INTO global_priv SELECT * FROM tmp_user_sys WHERE NOT @had_sys_user;', Gtid 0-1-6, Internal MariaDB error code: 1062 2020-07-06 23:56:15 10 [Warning] Slave: Duplicate entry 'localhost-mariadb.sys' for key 'PRIMARY' Error_code: 1062 2020-07-06 23:56:15 10 [ERROR] Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with "SLAVE START". We stopped at log 'mysql-bin.000001' position 3324; GTID position '0-1-5' 
mysql error on the replica states when copying the DB:
020-07-06 23:56:48 13 [ERROR] Slave SQL: Error 'Table 'mysql.tmp_user_sys' doesn't exist' on query. Default database: 'mysql'. Query: 'INSERT INTO global_priv SELECT * FROM tmp_user_sys WHERE NOT @had_sys_user;', Gtid 0-1-6, Internal MariaDB error code: 1146 2020-07-06 23:56:48 13 [Warning] Slave: Table 'mysql.tmp_user_sys' doesn't exist Error_code: 1146 2020-07-06 23:56:48 13 [ERROR] Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with "SLAVE START". We stopped at log 'mysql-bin.000001' position 3324; GTID position '0-1-5' 2020-07-06 23:56:48 13 [Note] Slave SQL thread exiting, replication stopped in log 'mysql-bin.000001' at position 3324; GTID position '0-1-5' 

What am I missing? Are you supposed to start it with ignore issues so it works once? or skip the 'mysql' database? I'm just baffled that with a config that has all binary logs since a fresh install that this isn't working to roll "forward".
SOLVED: So, dug into how the GTID works. Apparently, if you don't set a GTID initially on the new replica server it starts from 0. So, you have to convert the master status to a GTID. You can do this by running on the master:
> show master status; > SELECT BINLOG_GTID_POS('file', POSNUM); 
where the file and POSNUM are the file and Position Number from the show master command.
On the replica you then run:
> SET GLOBAL gtid_slave_pos = 'GTIDNUM'; 
where the GTIDNUM is the output from the SELECT. This sets the position. You can then run your `CONNECT TO MASTER....` with the GTID mode and it will roll forward from the restore point.
submitted by rhavenn to mariadb [link] [comments]

[JVerse] Rebirth Chapter 12, A Flash of Green

So to update you all on things, my hernia surgery went well and my intestines are back where they belong. Sadly I didn't have as much time to write as I would have liked, (pain meds will do that), but I managed to finally get chapter twelve done in time to give you all an extra dose of JVerse once you have finished our lord and savior's most recent chapter.

(Story is continued in the comments)
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<First><Previous><Next>
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Date Point: 3 months, 2 weeks, 5 days A.V.
Unnamed system
Planet 4 ring system
Requiem
Michael Kepler
"God damn I missed this," Michael said, flipping the Requiem around another asteroid, testing the limits of the inertial compensators.
They had gotten lucky and found the perfect system to test out the newly retrofitted Requiem. The system in question turned out to be a binary system with some rocky bodies and a truly gorgeous blue gas giant that sported a system of ice rings that were just perfect for running the old girl through her paces.
Michael gave the main thrusters all they could take, slipping through two asteroids seconds before they collided. There was a muffled cheer through the comms from the rest of the crew back onboard the Dawn. He had set up cameras all over the Requiem so his crew could watch. Right now only himself and Hephaestus were crazy enough to fly a ship built from scrap through one of the densest ring systems on record. Even Ralthin wasn't that crazy, having said that he'd rather shoot the rocks instead.
They dodged, dived, and weaved their way through the belt for another half an hour before Michael got a comms ping. He angled the ship "up" and rocketed out of the belt so he could answer without having to dodge rocks.
"What's up," Michael asked, angling the ship so he was cruising parallel to the rings.
Goralin's face showed up on the screen, "We just synced with Haven's network, and you've got a message from Gabby."
Before they had left Haven Michael had signed them up as Gabby's new security force. To keep in touch in case of an emergency Michael had purchased an FTL comms array and had set it up to sync with the local network on Haven every week. Of course, if there was an actual emergency he had spent a small fortune on a pair of quantum entangled arrays for instantaneous recall. The fact that Goralin's ears had a mischievous tilt meant that this wasn't an emergency. Meaning that it was probably the favor he had asked before they left.
"Alright, prep the hangar bay. I'm gonna test the emergency recall drive," Michael said, cutting the thrusters and letting the ship coast.
"Copy that Michael. Wait to jump until we give you the signal," Goralin said, closing the channel.
Michael switched over to the intercom, "Sorry Hephaestus, looks like we're gonna have to cut this short."
"It isss fine," Hephaestus said with the barest hint of a chuckle, "If the messsage isss from Gabby I can only think of one reassson. We are going hunting!"
"Cool your jets, we still haven't heard it yet," Michael said, running the ship through the pre-jump sequence, "All set to jump?"
One other little upgrade they did was to configure a jump drive onboard the Requiem so they could get back to the Dawn in a hurry. The only downside was that the hangar bay had to be depressurized so the sudden appearance of the Requiem didn't create a hull rupturing pressure wave.
"All sssyssstemsss are green," Hephaestus said back through the comms, "Ready for jump."
It was only a few more seconds until Michael got the comms ping signaling that the hangar bay was ready.
Michael's finger hovered over the button, "Jumping in three...two...one."
He pushed the button and the ship was inside the Dawn, perfectly centered in the hangar bay. The docking clamps engaged and the bay was pressurized in minutes. Michael ran through the shutdown sequence, unstrapped himself from the pilot seat and met Hephaestus in the airlock. They double-checked the atmospheric readout on the panel before opening the outer door. Even though Michael was wearing his armor and had no fear of stepping into hard vacuum, Hephaestus was basically naked, so it paid to be careful. They made their way up to the bridge, stopping by the mess to apologize for cutting the show short and so Michael could grab a quick snack. One downside of his new armor was that he burned a lot more calories than he ever did wearing his old suit. He walked the rest of the way up to the bridge with Hephaestus in tow.
When he opened the door to the bridge Goralin turned around in the copilot's seat, "You enjoy yourselves," he asked with a slightly mischievous tilt to his ears.
"Yeah!" Michael said enthusiastically, "and I gotta say, yinz missed a hell of a ride."
"I'll have to take your word on that one," Goralin said with a chitter, "Anyway, while we were waiting, I went through the files that were attached to the message and it looks like she sent us a good one."
"Oh," Michael asked, interested, "she send anything else?"
"Just a few video files," Goralin trailed off.
Michael looked around to see the rest of the bridge crew barely able to hold back their chittering.
So they were those kinds of videos…
Michael sighed, "Put the important one up on the main screen. I'll take a look at the rest later."
Goralin flicked his ears in amusement and brought up the message file.
Gabby appeared on the main screen, thankfully wearing her work outfit, with a cqcq cigarette in her hand, "Long time no see," she said, taking a hit and blowing the smoke off-screen, "I had my contacts do some digging and they found a good one. There's no bounty, sadly, but I don't think you'll have a problem with that. Everything you'll need should be in the files I sent along with some...other things I know you'll like," she winked at the camera, "Hoping to hear back from you soon."
"Did she send a location," Michael asked, turning toward Goralin.
"Already punched in," Goralin said with a pant-grin.
"Good man," Michael said with a gentle clap on Goralin's shoulder, "Prep the ship for warp, I'm gonna head to my quarters to uhh…review the other files she sent and get a reply together to send over during the next sync."
Michael left the bridge to sound of barely contained chittering from the crew and made his way back to his quarters. When he reached the mess heard raised voices coming from inside. So he stopped to eavesdrop just outside the door.
"For the last time Jilink," Guln said, "I have absolutely no interest in your insane delusions. No matter how...impressive you may find the humans in their mating practices!"
"Oh come now," Jilink said dismissively, "You seriously cannot believe that the way our species handles reproduction is good for our long term survival can you?"
"What other choice do we have," Guln asked, "we have long since passed the point of being biologically able to reproduce, but that is beside the point," he lowered his voice, "it was simply proposing the idea of reverting back to biological reproduction that made you one of the few Corti that had their banner status stripped all the way down to yellow."
"That was just because those in the Directorate are too narrow-minded to see past their own hubris," Jilink said angrily, "it was only when I started unlocking and splicing genes that had been previously bred out that I started to question their rhetoric. If you would just let me-"
"No! I will not hear of it. Mess with your own genetic code all you want, but I will not have you turning myself and Kilnq into genetic freaks," Guln said, moments before storming out of the mess. He ignored Michael and headed off toward the med bay.
Michael poked his head into the mess and saw Jilink sitting alone, forlornly picking at a plate of steamed mushrooms and cqcq.
She looked up as he walked over, "If you are going to play at eavesdropping you might want to consider that we can feel your every step through the deck plating," she said with a shrewd look.
"So what was your banner status," Michael asked bringing over a chair that could support the weight of himself and his armor. He sat down and took off his helmet, placing it on the table in front of him.
"No remorse and straight to the point I see," she let out a deep sigh, "Before I began...experimenting...on myself, I was a silver banner."
From what Michael knew about Corti social structure, Jilink had been next to royalty. To give all that up...
"Fuck," Michael said, recovering from his jaw practically denting the table, "Why the hell did you give that up?"
"To advance my species of course," she said, her eyes boring into Michael's, "we may be the most technologically advanced in the galaxy, but as a species we Corti have fallen behind tremendously. I may be too brazen in saying this, but we are on the brink."
"On the brink," Michael asked, "the brink of what?"
Jilink's expression hardened, "The brink of terminal decline, and unless something is done my species will fade into obscurity."
"And that something was playing with your own genetics," Michael asked, confused.
"Not playing," Jilink said, waving one finger back and forth, "Improving. As we are, the Corti are far from ideal. Intelligent and quick-witted yes, but we lack the physicality to endure as a species for much longer."
"And that has to do with what Guln said about the way yinz reproduce," Michael asked, even more confused, "you mean yinz don't have kids naturally?"
"As a matter of fact, we do not. Every Corti is grown in a birthing tank," Jilink said matter of factly, "there hasn't been a natural birth for millennia."
"Well that's all kinds of fucked up," Michael said, shaking his head, "and they kicked you out for wanting to go back to the way things are supposed to be?"
"Precisely. You see, reverting back to biological reproduction would necessitate drastic changes to our biology. It is also the reason why I am so fascinated with how other species reproduce. I have been able to get a wealth of medical data on the subject, but the one thing that most species lack is information on how to make the act more enjoyable. Your species, however," she pointed at Michael's chest, "seems to excel in that regard."
"I can see your point," Michael said with a chuckle.
"Needless to say there are some practices that simply watching recordings cannot fully explain. You do not mind answering some questions do you," Jilink asked excitedly.
Michael shrugged, "I got time. Ask away."
Jilink pulled a small tablet from her set of pouches and tapped in a few commands, "I'll start with something that has perplexed me for some time now. Tell me, what is the exact purpose of a bukkake?"
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Ten thousand kilometers astern of the Radiant Dawn
Whispering Breeze
Agent One Six Two
Something was wrong.
He had been trying to link to the infrared module that was hidden next to the engine cluster on that accursed human's ship for over [an hour] only to receive no response. He double and triple checked that his ship was aligned correctly and found not the barest hint of any discrepancy. This left two possibilities, either the module had malfunctioned, or it had been taken offline. Given the extremely stable nature of current solid-state electronics, the latter of the two options seemed the most probable.
He was now forced to consider alternative plans to get the information he needed. One option was to take over one of the human's crew, but the chances of finding one of them alone long enough for him to adjust to the new sensory input were astronomical at best. There was always the option of simply biodroning all the implanted crew, but with the proven combat capabilities of the human and his pet abomination, there was no guarantee of successfully taking over the ship. That left only one option that had any probability of success.
Once the human's ship was out of the system and had no hope of detecting him, One Six Two punched in the codes for the only jump beacon that the human had deployed.
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Date point: 4 months, 2 weeks, 5 days AV
Sol system
Earth
Allegheny National Park
Daniel Mackovich
After the Vancouver incident life had gone on pretty much the same as always. As much as he hated to admit it, Daniel wished the aliens had caused more damage. As it was now, people had already moved on. Of course, every news outlet on the planet had milked the story dry within a week, but since nobody other than the aliens had died the story that humanity was no longer alone in the universe had been replaced by the same old shit. Shootings, trouble in the Middle East, China violating human rights, the usual stuff.
Both he and David were sick of it. So they had planned a little something to get away. That little something happened to be a camping trip out in Allegheny National Park. Not the biggest excursion by a long shot, but it seemed a couple of days out in the woods was just what the doctor ordered.
The first night was just perfect. No rain or swarms of mosquitos, just hours of watching caveman TV with a good meal cooked over the fire to finish out the night. They had been watching the weather and had made sure that there wasn't the barest hint of rain, but it looked like the curse of his old Boy Scout troop had followed him. It had started raining shortly after lunch on the second day. Thanks to a few tricks he'd learned in said cursed Boy Scout troop, Daniel was able to get the fire going, even though all their wood was soaked, so they were at least able to cook their dinner under the tarp David had rigged up over the fire pit.
"Well, it wasn't what we were expecting," David said, looking out of the tent, "but I can think of worse ways to spend the evening."
"My old scout troop was called the Rain Makers after all," Daniel said with a chuckle, snuggling a little closer to David, "At least the company's better this time around."
They sat and watched for a while, listening to the gentle sound of the rain on their tent.
David turned around and rummaged around in his bag for a few moments before turning back and locking eyes with Daniel.
"Well...I was hoping for a better opportunity but," David trailed off.
Daniel looked down at what David was holding in his hand and his breath caught in his throat.
"Daniel, will you marry me?"
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Date point: 9 months, 1 week, 2 days AV
Far Reaches
Cimbrean
Radiant Dawn
Michael Kepler
They had made the trip out in astonishingly good time thanks to the black box drive on the Radiant Dawn. Fast as their ship was it had still taken them around six months to reach this little speck of nowhere. However, the extra time gave Michael the chance to work out some armor for his Gaoian crewmates. They had to stop and resupply before they could manufacture any of it though. It seemed that they had burned through most of their supplies for the nanofac with the Requiem's retrofit.
The armor they had worked out was much like Hephaestus' in the way that it relied heavily on lightweight composite plates instead of heavy alloys like Michael's. The plus side was that Hephaestus had worked out a composite that could take multiple hits from a heavy pulse cannon before failing. Not that the Gaoians would be taking much fire though, each one had a portable cloaking generator to make the best use of their natural talent for sneaking. There was one problem with the suits though, they had to be kept loose to accommodate the Gaoians' fur. Which meant that they would have to rely on shield harnesses for protection against the vacuum of space. Not the best prospect in Michael's mind, but they didn't seem to have the aversion to relying on forcefield tch like he did.
And since Michael wanted some semblance of a uniform for his new band of mercs, the chest plate and helmet had kept as much of the standard Mandalorian looks as possible. The helmet was kinda tricky, considering that the Gaoians had much longer noses than humans, as well as ears that came out of the top of their heads.
In the end, Gaoians had to deal with the minor discomfort of having their ears squished down, but it was worth it if they wanted to have their heads protected. As for the stereotypical "T" shaped visor, Michael settled on a shortened version, ending just above the Gaoians' snouts with a protrusion to cover their nose and mouth. It also had the benefit of allowing the Gaoians to personalize the lower portion, and once one of them had painted fangs on his, the rest had followed suit. Michael had to admit, it looked totally badass.
The extra time also gave them the chance to develop their arsenal. The standard pulse guns were ditched in favor of coilguns. Most of the Gaoians went with something like an AR-15. They were lightweight, with a variable power setting so they didn't over-penetrate their targets if they were inside a ship or station. The real treat was what the brownies came up with though. The crazy fuckers had amped up their coilguns to a heavy machine gun type thing that could send a withering hailstorm of slugs at whatever unfortunate thing that happened to be on the receiving end. However, it seemed that all of the Gaoians took a liking to Hephaestus' fusion claws and had added their own to finish out their already terrifying array of weapons.
They had spent three of the local days cloaked in a high polar orbit mapping the planet and trying to find the location of the palace that was supposed to be here. The only reason it took that long was that they were using passive scans to prevent the discovery of their ship. Since they were stuck in orbit Michael had left it up to the bridge crew to notify him when they found anything. To pass the time and get a better feel on things he had been going through the files on their target. After cross-referencing them with the data from the Twisted Suns it seemed that this particular fucknut had an affinity for ordering Rickytics and Vizkiticks among a smattering of a dozen other species.
It couldn't be...could it?
Michael dug deeper into the records until he found the right entry. Shit.
"Ship," Michael said as he got up from his desk and stretched, still marveling at just how flexible his new armor was.
He got a response ping.
"Where is Irk?"
"Irk is in hydroponics," the ship said through his room's intercom in a perfect replica of Cortana’s voice. Michael didn't know why, but using Cortana's voice for the ship just felt right.
Michael grabbed his helmet and locked it in place.
"Send him a message that I'm on my way. There's something I need to talk to him about."
Michael went to hydroponics and found Irk in his personal corner behind their crop of cqcq minding his bonsai garden. He had originally got the idea from watching Karate Kid of all things. When they had stopped at Haven Irk had purchased a bunch of seedlings from all over the galaxy. As it turned out most of them had the same reaction as Earth trees when they were root-bound inside a small pot. With a little help from some space magic in the form of time acceleration fields, he had more than a dozen perfectly healthy miniature trees. With careful management, Irk had produced some truly fantastical shapes. Hell, he even had one "pot" that was levitating with trees growing out of both the top and bottom.
When Michael walked over Irk turned around, "Ah, Michael. You have something you wanted to speak to me about?"
"Yeah," Michael said, taking off his helmet and setting it down on the table next to the levitating bonsai trees, "It's about our target."
Irk gave him a quizzical look, tilting his head slightly to the side.
Michael took a deep breath, "There was a bit of a mix up on the part of the Twisted Suns. Your lifemate and child were actually supposed to be shipped here."
"But...the Hunters," Irk trailed off.
"That's not all," Michael said, shaking his head, "I really don't have a good way to say this...but it looks like the scumbag we're after wanted you and your family specifically."
Irk slumped to the deck, lost for words.
"I did some digging into the data we got from the Twisted Suns," Michael said, bringing up the file and sending it to Irk's tablet.
It pinged and Irk pulled it out of its pouch with shaking hands. He hesitated for a moment before opening it. Delicately, he tapped the icon and read the file. Irk put the tablet back into its pouch and was silent for a few moments before he gathered his legs under himself and stood up to his full height.
He looked directly at Michael, "I have only one request."
"Name it," Michael said, locking eyes with Irk.
"Bring the bastard to me alive," Irk said with enough bile dripping off the borrowed human curse word to make Michael flinch.
No sooner had Irk walked out of hydroponics did Michael receive a notification from the bridge crew. He put his helmet back on and answered the comms.
"Yinz found something," he asked, exiting hydroponics and making his way up to the bridge.
"Yeah," Goralin said through the comms, "and you're gonna want to see this."
"On my way," Michael said, breaking into a run for the hundred-ish meters to the bridge.
He exploded into the bridge and skidded to a halt right next to Goralin. Michael was a little out of breath, but it wasn't too bad considering the weight of his armor. Practically living in the suit had its benefits sometimes.
Goralin eyed Michael with a hint of amusement "Excited?"
"Damn right," Michael said with a chuckle, "we've only been orbiting this dirtball for three days. What'd you find?"
"See for yourself," Goralin said with a pant-grin, bringing up what looked like a palace on the main screen.
Michael let out a long whistle, "Damn that had to cost a pretty penny."
What was on screen was possibly the most egregious display of wealth that Michael had ever seen, aside from his own ship of course. Camera tech was really something else out here, they had to be at least a hundred and fifty kilometers up, but the pictures were clear enough that Michael could see the contents of the gardens surrounding the enormous palace complex. He'd read the specs when he had the sensor suite overhauled, but the fact that their ground facing camera was in the hundred gigapixel range never quite hit home until he had actually used it.
"Cost a what," Goralin asked, tilting his head slightly.
"Oh, sorry," Michael said, a little embarrassed, "it's an expression for a fuckton of money."
Goralin chittered, "Well the palace isn't the only thing that cost a pretty penny. We found something else too."
The next thing that came up on the screen left Michael totally speechless. Not too far off the coast was a yacht so big it was practically a floating island. Hell, it even had football-field sized space in the middle that was containing a miniature forest.
"Well if they're anywhere, our target's probably on that yacht," Michael said, gesturing to the screen.
Goralin zoomed in on it, "It looks like there's a landing pad big enough to land the Requiem near the back."
"Well, it's our lucky day then," Michael said, turning back toward the door, "get an assault team ready. We're dropping in an hour."
"An assault team," Goralin asked, his ears going slightly back.
Michael stopped and turned back around, "Rich fucker like that's gotta be able to afford some really good security, and not the average Chennash mercs either."
"Right," Goralin said, "I know Ralthin's gonna be damn happy to finally get a good fight for once," he finished with a slight chitter.
The next hour flew by in a flurry of activity as the assault team got the message and scrambled to get into their armor. Thankfully they didn't need to load any cargo into the Requiem, and they already had all their extra weapons stored onboard. Michael made a stop by his quarters to grab his coilgun and its barrel attachments. On a whim, he dug out his antique revolver and strapped it to his hip. He had to stop and laugh at the absurdity of carrying a black powder revolver that was made in eighteen seventy-six, but something just felt right about bringing the old girl along.
He made it to the hangar bay just as everyone was getting situated. Hephaestus was already onboard the Requiem running through the preflight checks from his station near the quantum stacks so all Michael had to do was wait for the rest of the assault team to show up. When everyone was strapped in and had their gear stowed for the drop he stepped out to the open space in the middle of the Requiem's cargo area.
"Alright," Michael said, running his eyes over the seated Gaoians, "it's our first mission and from the looks of things, it's not gonna be an easy one. We're going in blind and this fucker's probably paranoid enough to have hired some decent security. They won't be like the pirate scum yinz are probably used to. Hell, I wouldn't be surprised if there's a company of Allebenellin mercs waiting for us."
Michael paused and let that sink in for a moment, "The main problem is that the yacht we're gonna be landing on is fucking huge. So the plan's pretty simple myself, Hephaestus, Ralthin, and the brownies are gonna raise hell so all the rest of yinz can use your cloaking fields to the best advantage. Sweeping the ship for any other hostiles while looking for our target."
That got some chittering out of them.
"As for our target," Michael said, starting to pace back and forth in front of the seated Gaoians, "he's a Robalin with some… strong opinions on other sentient life. Apparently, this guy acquired his fortune thanks to some kind of breakthrough in medical tech and bought the palace at an auction when the previous owner's trading company went under thanks to some very poor business deals and Hunter raids on their ships. Ever since, he's lived a comfortable life on Cimbrean buying slaves from the Twisted Suns for God knows what reason," Michael let out a long sigh, "And as much as I'd like to end this guy the second we find him, Irk wants him alive. It seems that this fucker is the one that got Irk's family captured by the Twisted Suns."
"An that's why we're not just gonna blast the boat," Yeg asked.
"Exactly," Michael said, pausing to congratulate him, "there also might be slaves still on board, so any we find get to come back with us. Any questions?"
"Yeah," one of the other brownies spoke up, "when are ya gonna quit talkin' so we can have some fun?"
Michael laughed, "Alright alright, I get it," he said, vaulting up the ramp to the cockpit, "hold on to your tails, it's gonna be a bumpy ride."
Michael entered the cockpit and closed the door behind him, and once he was in the pilot seat he opened the intercom, "We ready to go?"
"The ssship isss ready to depart Michael," Hephaestus said back eagerly.
Michael gave the signal to the hangar crew and waited while they depressurized the hangar bay and opened the outer door.
Michael opened a channel to the bridge, "Yinz keep an eye out while we're planetside, we might need to come back in a hurry."
"Just make sure you don't die down there," Goralin said with a slight chitter, "We'll be waiting for you."
"We'll make sure to come back in one piece," Michael said with a chuckle, quickly running through the preflight checks. Hephaestus had already done them so all he had to do was to glance at the display and be sure that all systems were green, "but if yinz are that worried, I'll broadcast the view from my helmet cam."
"You know," Goralin said, "I was gonna suggest the same thing. It'll make for good entertainment."
"You got that right," Michael said entering the command to release the docking clamps, "Undocking now," Michael said closing the channel and backing the ship out of the hangar bay.
Once he was clear of the ship Michael angled the Requiem toward the planet and threw the throttle all the way forward.
"Uunngfhhh...Fyu's balls," Ralthin growled through the comms, "I forgot about that."
"Yinz okay back there," Michael asked, pulling the throttle slightly back.
"Other than bein' crushed inta our seats we're fine," Ralthin said back with a forced chitter.
"Hey, I said it was gonna bumpy ride," Michael said with a smirk.
They made the rest of the trip down in silence and before long they were punching a hole through the atmosphere leaving a flaming trail of plasma behind them. The yacht appeared on the radar when they were still twenty kilometers up, not that Michael needed sensors to find the thing, he could already see it. Floating island was right, the damned thing had to be nearly as big as the Dawn.
When they were about ten kilometers out the comms panel lit up. Out of curiosity, Michael opened the channel.
"Unidentified vessel you are appro-"
Michael closed the channel, his curiosity stated for the moment. No use talking with them anyway. He closed the rest of the distance gradually slowing down so they wouldn't overshoot.
When they got within a kilometer Michael had to admit that the yacht was a truly beautiful ship. It had three hulls connected together by an expansive main deck that swept into a sharp point at the bow where the main hull was cutting through the waves. The most prominent feature being the forest in the middle of the ship protected from the elements by the telltale shimmer of a forcefield.
The landing pad near the stern was suspiciously empty, but when Michael brought the Requiem closer he noticed that it had some kind of door in the middle. No doubt it was used for bringing whatever landed down into some kind of hangar. There was no way the Requiem would fit into said hangar, but it looked like the pad was just large enough to set the ship down. Strangely, the yacht seemed to be holding course, almost inviting him to land.
He activated the inter-ship comms, "Looks like they're actually gonna let us land. The second we touch down I want the brownies out first. Shoot first, ask questions later."
Michael flipped the ship around so she was hovering just above the deck and matched speed with the yacht. He lined it up using the docking camera and set her down with a gentle thump. The very next thing he did was take control of the nose turrets, aiming them at the only door in the aft section of the yacht.
He set the ship in low power mode instead of completely shutting down just in case they needed to make a quick getaway, and watched through the turret camera feed as the brownies stormed out of the ship and took their positions. Sloppy by any kind of military standards, but it didn't seem like there was anyone to greet them.
Michael unstrapped himself and grabbed his coilgun from the rack next to the door. Walking down the ramp was always tricky thanks to the gravity weirdness, but thankfully he didn't stumble when he stepped off into the planet's own gravity.
"No one to meet us," he said, stepping out into the sunlight.
Ralthin glanced back at Michael over his shoulder, "I don't like this at all. Even through this helmet, it smells all kindsa wrong."
Hephaestus came up behind Michael, "Thisss feelsss like a trap."
"Couldn't agree with you more buddy," Michael said, walking forward to the door.
"What'd ya wanna do," Ralthin said following close behind.
Michael glanced at Ralthinand smirked, "Spring the trap."
submitted by Asikar_Tehjan to HFY [link] [comments]

How to Improve MySQL AWS Performance 2X Over Amazon RDS at The Same Cost

AWS is the #1 cloud provider for open-source database hosting, and the go-to cloud for MySQL deployments. As organizations continue to migrate to the cloud, it’s important to get in front of performance issues, such as high latency, low throughput, and replication lag with higher distances between your users and cloud infrastructure. While many AWS users default to their managed database solution, Amazon RDS, there are alternatives available that can improve your MySQL performance on AWS through advanced customization options and unlimited EC2 instance type support. ScaleGrid offers a compelling alternative to hosting MySQL on AWS that offers better performance, more control, and no cloud vendor lock-in and the same price as Amazon RDS. In this post, we compare the performance of MySQL Amazon RDS vs. MySQL Hosting at ScaleGrid on AWS High Performance instances.

TLDR

ScaleGrid’s MySQL on AWS High Performance deployment can provide 2x-3x the throughput at half the latency of Amazon RDS for MySQL with their added advantage of having 2 read replicas as compared to 1 in RDS.

MySQL on AWS Performance Test

ScaleGrid Amazon RDS
Instance Type AWS High Performance XLarge (see system details below) DB Instance r4.xlarge(Multi-AZ)
Deployment Type 3 Node Master-Slave Set with Semisynchronous Replication Multi-AZ Deployment with 1 Read Replica
SSD Disk Local SSD & General Purpose – 2TB General Purpose – 2TB
Monthly Cost (USD) $1,798 $1,789
As you can see from the above table, MySQL RDS pricing is within $10 of ScaleGrid’s fully managed MySQL hosting solution.

What are ScaleGrid’s High Performance Replica Sets?

The ScaleGrid MySQL on AWS High Performance replica set uses a hybrid of local SSD and EBS disk to achieve both high performance and high reliability. A typical configuration is deployed using a 3-node replica set:
What does this mean? Since the Master and the Slave-1 are running on local SSD, you get the best possible disk performance from your AWS machines. No more network-based EBS, just blazing-fast local SSD. Reads and writes to your Primary, and even reads from Slave-1 will work at SSD speed. Slave-2 uses an EBS data disk, and you can configure the amount of IOPS required for your cluster. This configuration provides complete safety for your data, even in the event you lose the local SSD disks.
ScaleGrid’s MySQL AWS High Performance XLarge replica set uses i3.xlarge (30.5 GB RAM) instances with local SSD for the Master and Slave-1, and an i3.2xlarge (61 GB RAM) instance for Slave-2.

MySQL Configuration

A similar MySQL configuration is used on both ScaleGrid and RDS deployments:
Configuration Value
version 5.7.25 community edition
innodb_buffer_pool_size 25G
innodb_log_file_size 1G
innodb_flush_log_at_trx_commit 1
sync_binlog 1
innodb_io_capacity 3000
innodb_io_capacity_max 6000
slave_parallel_workers 30
slave_parallel_type LOGICAL_CLOCK

MySQL Performance Benchmark Configuration

Configuration Details
Tool Sysbench version 1.0.17
Host 1 r4.xlarge located in the same AWS datacenter as the Master MySQL
# Tables 100
# Rows per table 5,000,000
Workload generating script oltp_read_write.lua

MySQL Performance Test Scenarios and Results

To ensure we provide informative results for all MySQL AWS workload types, we have broken down our tests into these three scenarios so you can evaluate based on your read/write workload intensity:
  1. Read-Intensive Workload: 80% Reads and 20% Writes
  2. Balanced Workload: 50% Reads and 50% Writes
  3. Write-Intensive Workload: 20% Reads and 80% Writes
Each scenario is run with varying number of sysbench client threads ranging from 50 to 400, and each test is run for a duration of 10 minutes. We measure throughput in terms of Queries Per Second (QPS) and 95th Percentile latency, and ensure that the max replication lag on the slaves does not cross 30s. For some of the tests on the ScaleGrid deployment, MySQL configuration binlog_group_commit_sync_delay is tuned so that the slave replication lag does not go beyond 30s. This technique is referred to as ‘slowing down the master to speed up the slaves’ and is explained in J-F Gagne’s blog.

Scenario-1: Read-Intensive Workload with 80% Reads and 20% Writes

ScaleGrid vs Amazon RDS: MySQL Throughput Performance Test - 80 Percent Read 20 Percent Write
As we can see from the read-intensive workload tests, ScaleGrid high performance MySQL instances on AWS are able to consistently handle around 27,800 QPS anywhere from 50 up to 400 threads. This is almost a 200% increase over MySQL RDS performance which averages only 9,411 QPS across the same range of threads.
ScaleGrid vs Amazon RDS: MySQL Latency Performance Test - 80 Percent Read 20 Percent Write
ScaleGrid also maintains 53% lower latency on average throughout the entire MySQL AWS performance tests. Both Amazon RDS and ScaleGrid latency increase steadily as the number of threads grows, where ScaleGrid maxes out at 383ms for 400 threads while Amazon RDS is at 831ms at the same level.

Scenario-2: Balanced Workload with 50% Reads and 50% Writes

ScaleGrid vs Amazon RDS: MySQL Throughput Performance Test - 50 Percent Read 50 Percent Write
In our balanced workload performance tests, ScaleGrid’s MySQL High Performance deployment on AWS outperforms again with an average of 20,605 QPS on threads ranging from 50 to 400. Amazon RDS only averaged 8,296 for the same thread count, resulting in a 148% improvement with ScaleGrid.
ScaleGrid vs Amazon RDS: MySQL Latency Performance Test - 50 Percent Read 50 Percent Write
Both ScaleGrid and Amazon RDS latency significantly decreased in the balanced workload tests compared to the read-intensive tests covered above. Amazon RDS averaged 258ms latency in the balanced workload tests, where ScaleGrid only averaged 125ms achieving over a 52% reduction in latency over MySQL on Amazon RDS.

Scenario-3: Write-Intensive Workload with 20% Reads and 80% Writes

ScaleGrid vs Amazon RDS: MySQL Throughput Performance Test - 20 Percent Read 80 Percent Write
In our final write-intensive MySQL AWS workload scenario, ScaleGrid achieved significantly higher throughput performance with an average of 17,007 QPS over the range of 50 to 400 threads. This is a 123% improvement over Amazon RDS who only achieved 7,638 QPS over the same number of threads.
ScaleGrid vs Amazon RDS: MySQL Latency Performance Test - 20 Percent Read 80 Percent Write
The 95th percentile latency tests also produced significantly lower latency for ScaleGrid at an average of 114ms over 50 to 400 threads. Amazon RDS achieved an average of 247ms in their latency tests, resulting in a 54% average reduction in latency when deploying ScaleGrid’s High Performance MySQL on AWS services over Amazon RDS.

Analysis

As we observed from the test results, read-intensive workloads resulted in both higher throughput and latency over balanced workloads and write-intensive workloads, regardless of how MySQL was deployed on AWS:
MySQL on AWS Throughput Performance Test Averages ScaleGrid Amazon RDS ScaleGrid Improvement
Read-Intensive Throughput 27,795 9,411 195.4%
Balance Workload Throughput 20,605 8,296 148.4%
Write-Intensive Throughput 17,007 7,638 122.7%

MySQL on AWS Latency Performance Test Averages ScaleGrid Amazon RDS ScaleGrid Improvement
Read-Intensive Latency 206ms 439ms -53.0%
Balanced Workload Latency 125ms 258ms -51.6%
Write-Intensive Latency 114ms 247ms -53.8%

Explanation of Results

ScaleGrid ‘High Performance’ deployment can provide 2x-3x the throughput at half the latency of RDS with an added advantage of having 2 read replicas as compared to 1 in RDS. To learn more about ScaleGrid's MySQL hosting advantages over Amazon RDS for MySQL, check out our Compare MySQL Providers page.
submitted by ScaleGrid_DBaaS to mysql [link] [comments]

Connect to mongo via SSL

0
I try to connect to mongo via SSL Certificate. I use MongoClientOptions. I set SSLContext to SSLContext with KeyManager(with my certificate) and TrustManager(allow all). I use VM option javax.net.debug=ssl.
Before i had errors from javax.net.debug like fatal, description = unknown_certificate, but now i see only warning close_notify during ssl handshake so i can't undersdant why mongo return 18 Authenticate Failure. Also my certificate recognized fine, i see it in the same logs from javax.net.debug=ssl
My SSLContext:
private static SSLContext getNoopSslSocketFactory() { SSLContext sslContext; try { sslContext = SSLContext.getInstance("SSL"); FileInputStream myKeys = new FileInputStream("jopa.jks"); KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509"); KeyStore keyStore = KeyStore.getInstance("JKS"); keyStore.load(myKeys, "password".toCharArray()); kmf.init(keyStore, "password".toCharArray()); KeyManager[] keyManagers = kmf.getKeyManagers(); sslContext.init(keyManagers, new TrustManager[]{new X509TrustManager() { @Override public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException { } @Override public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException { } @Override public X509Certificate[] getAcceptedIssuers() { return new X509Certificate[0]; } }}, new SecureRandom()); } catch (Exception e) { throw new RuntimeException(e); } return sslContext; } 
My MongoClient settings:
List serverAddresses = new ArrayList<>(); serverAddresses.add(new ServerAddress( host, 30300)); serverAddresses.add(new ServerAddress( safetyHost, 30300)); MongoCredential credential; if (environment.getActiveProfiles().length == 0 || environment.getActiveProfiles()[0].equals("!test")) { credential = MongoCredential.createCredential( username, database, password.toCharArray()); } else { credential = MongoCredential.createCredential( username, databaseTest, password.toCharArray()); } MongoClientOptions options = MongoClientOptions.builder() .readPreference(ReadPreference.primaryPreferred()) .retryWrites(true) .requiredReplicaSetName("replset") .maxConnectionIdleTime(6000) .sslContext(getNoopSslSocketFactory()) .sslEnabled(true) .build(); return new MongoClient(serverAddresses, credential, options); 
My error:
 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, WRITE: TLSv1.2 Application Data, length = 352 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, READ: TLSv1.2 Application Data, length = 1248 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, READ: TLSv1.2 Application Data, length = 1216 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, WRITE: TLSv1.2 Application Data, length = 128 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, WRITE: TLSv1.2 Application Data, length = 128 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, READ: TLSv1.2 Application Data, length = 1504 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, WRITE: TLSv1.2 Application Data, length = 272 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, READ: TLSv1.2 Application Data, length = 1504 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, WRITE: TLSv1.2 Application Data, length = 272 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, READ: TLSv1.2 Application Data, length = 336 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, READ: TLSv1.2 Application Data, length = 336 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, called close() cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, called closeInternal(true) cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, called close() cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, called closeInternal(true) cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, SEND TLSv1.2 ALERT: warning, description = close_notify cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, SEND TLSv1.2 ALERT: warning, description = close_notify cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, WRITE: TLSv1.2 Alert, length = 80 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, WRITE: TLSv1.2 Alert, length = 80 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, called closeSocket(true) cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, called closeSocket(true) 18-08-2019 23:30:18.487 [INFO ] iec-stats-custom, cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, org.mongodb.driver.cluster - Exception in monitor thread while connecting to server HIDDEN-SAFETY com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=null, userName='HIDDEN-NAME', source='logging-custom-test', password=, mechanismProperties={}} at com.mongodb.connection.SaslAuthenticator.wrapException(SaslAuthenticator.java:162) at com.mongodb.connection.SaslAuthenticator.access$200(SaslAuthenticator.java:39) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:68) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:46) at com.mongodb.connection.SaslAuthenticator.doAsSubject(SaslAuthenticator.java:168) at com.mongodb.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:46) at com.mongodb.connection.DefaultAuthenticator.authenticate(DefaultAuthenticator.java:32) at com.mongodb.connection.InternalStreamConnectionInitializer.authenticateAll(InternalStreamConnectionInitializer.java:122) at com.mongodb.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:52) at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:127) at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:114) at java.lang.Thread.run(Thread.java:748) Caused by: com.mongodb.MongoCommandException: Command failed with error 18: 'Authentication failed.' on server HIDDEN-SAFETY. The full response is { "operationTime" : { "$timestamp" : { "t" : 1566160216, "i" : 1 } }, "ok" : 0.0, "errmsg" : "Authentication failed.", "code" : 18, "codeName" : "AuthenticationFailed", "$clusterTime" : { "clusterTime" : { "$timestamp" : { "t" : 1566160216, "i" : 1 } }, "signature" : { "hash" : { "$binary" : "uwH/Dl+sK7tJdD/bxIejcXmhnLs=", "$type" : "00" }, "keyId" : { "$numberLong" : "6712027632940089345" } } } } at com.mongodb.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:164) at com.mongodb.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:295) at com.mongodb.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:255) at com.mongodb.connection.CommandHelper.sendAndReceive(CommandHelper.java:84) at com.mongodb.connection.CommandHelper.executeCommand(CommandHelper.java:34) at com.mongodb.connection.SaslAuthenticator.sendSaslStart(SaslAuthenticator.java:119) at com.mongodb.connection.SaslAuthenticator.access$000(SaslAuthenticator.java:39) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:52) ... 9 common frames omitted 18-08-2019 23:30:18.487 [INFO ] iec-stats-custom, cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, org.mongodb.driver.cluster - Exception in monitor thread while connecting to server HIDDEN com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=null, userName='HIDDEN-NAME', source='logging-custom-test', password=, mechanismProperties={}} at com.mongodb.connection.SaslAuthenticator.wrapException(SaslAuthenticator.java:162) at com.mongodb.connection.SaslAuthenticator.access$200(SaslAuthenticator.java:39) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:68) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:46) at com.mongodb.connection.SaslAuthenticator.doAsSubject(SaslAuthenticator.java:168) at com.mongodb.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:46) at com.mongodb.connection.DefaultAuthenticator.authenticate(DefaultAuthenticator.java:32) at com.mongodb.connection.InternalStreamConnectionInitializer.authenticateAll(InternalStreamConnectionInitializer.java:122) at com.mongodb.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:52) at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:127) at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:114) at java.lang.Thread.run(Thread.java:748) Caused by: com.mongodb.MongoCommandException: Command failed with error 18: 'Authentication failed.' on server HIDDEN. The full response is { "operationTime" : { "$timestamp" : { "t" : 1566160216, "i" : 1 } }, "ok" : 0.0, "errmsg" : "Authentication failed.", "code" : 18, "codeName" : "AuthenticationFailed", "$clusterTime" : { "clusterTime" : { "$timestamp" : { "t" : 1566160216, "i" : 1 } }, "signature" : { "hash" : { "$binary" : "uwH/Dl+sK7tJdD/bxIejcXmhnLs=", "$type" : "00" }, "keyId" : { "$numberLong" : "6712027632940089345" } } } } at com.mongodb.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:164) at com.mongodb.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:295) at com.mongodb.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:255) at com.mongodb.connection.CommandHelper.sendAndReceive(CommandHelper.java:84) at com.mongodb.connection.CommandHelper.executeCommand(CommandHelper.java:34) at com.mongodb.connection.SaslAuthenticator.sendSaslStart(SaslAuthenticator.java:119) at com.mongodb.connection.SaslAuthenticator.access$000(SaslAuthenticator.java:39) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:52) ... 9 common frames omitted Finalizer, called close() Finalizer, called closeInternal(true) Finalizer, called close() Finalizer, called closeInternal(true) 
submitted by nyawqabob to javahelp [link] [comments]

Connect to mongo via ssl, spring data

I try to connect to mongo via SSL Certificate. I use MongoClientOptions. I set SSLContext to SSLContext with KeyManager(with my certificate) and TrustManager(allow all). I use VM option javax.net.debug=ssl.
Before i had errors from javax.net.debug like fatal, description = unknown_certificate, but now i see only warning close_notify during ssl handshake so i can't undersdant why mongo return 18 Authenticate Failure. Also my certificate recognized fine, i see it in the same logs from javax.net.debug=ssl
My SSLContext:
private static SSLContext getNoopSslSocketFactory() { SSLContext sslContext; try { sslContext = SSLContext.getInstance("SSL"); FileInputStream myKeys = new FileInputStream("jopa.jks"); KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509"); KeyStore keyStore = KeyStore.getInstance("JKS"); keyStore.load(myKeys, "password".toCharArray()); kmf.init(keyStore, "password".toCharArray()); KeyManager[] keyManagers = kmf.getKeyManagers(); sslContext.init(keyManagers, new TrustManager[]{new X509TrustManager() { @Override public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException { } @Override public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException { } @Override public X509Certificate[] getAcceptedIssuers() { return new X509Certificate[0]; } }}, new SecureRandom()); } catch (Exception e) { throw new RuntimeException(e); } return sslContext; } 
My MongoClient settings:
List serverAddresses = new ArrayList<>(); serverAddresses.add(new ServerAddress( host, 30300)); serverAddresses.add(new ServerAddress( safetyHost, 30300)); MongoCredential credential; if (environment.getActiveProfiles().length == 0 || environment.getActiveProfiles()[0].equals("!test")) { credential = MongoCredential.createCredential( username, database, password.toCharArray()); } else { credential = MongoCredential.createCredential( username, databaseTest, password.toCharArray()); } MongoClientOptions options = MongoClientOptions.builder() .readPreference(ReadPreference.primaryPreferred()) .retryWrites(true) .requiredReplicaSetName("replset") .maxConnectionIdleTime(6000) .sslContext(getNoopSslSocketFactory()) .sslEnabled(true) .build(); return new MongoClient(serverAddresses, credential, options); 
My error:
 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, WRITE: TLSv1.2 Application Data, length = 352 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, READ: TLSv1.2 Application Data, length = 1248 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, READ: TLSv1.2 Application Data, length = 1216 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, WRITE: TLSv1.2 Application Data, length = 128 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, WRITE: TLSv1.2 Application Data, length = 128 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, READ: TLSv1.2 Application Data, length = 1504 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, WRITE: TLSv1.2 Application Data, length = 272 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, READ: TLSv1.2 Application Data, length = 1504 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, WRITE: TLSv1.2 Application Data, length = 272 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, READ: TLSv1.2 Application Data, length = 336 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, READ: TLSv1.2 Application Data, length = 336 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, called close() cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, called closeInternal(true) cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, called close() cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, called closeInternal(true) cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, SEND TLSv1.2 ALERT: warning, description = close_notify cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, SEND TLSv1.2 ALERT: warning, description = close_notify cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, WRITE: TLSv1.2 Alert, length = 80 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, WRITE: TLSv1.2 Alert, length = 80 cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, called closeSocket(true) cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, called closeSocket(true) 18-08-2019 23:30:18.487 [INFO ] iec-stats-custom, cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN-SAFETY, org.mongodb.driver.cluster - Exception in monitor thread while connecting to server HIDDEN-SAFETY com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=null, userName='HIDDEN-NAME', source='logging-custom-test', password=, mechanismProperties={}} at com.mongodb.connection.SaslAuthenticator.wrapException(SaslAuthenticator.java:162) at com.mongodb.connection.SaslAuthenticator.access$200(SaslAuthenticator.java:39) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:68) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:46) at com.mongodb.connection.SaslAuthenticator.doAsSubject(SaslAuthenticator.java:168) at com.mongodb.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:46) at com.mongodb.connection.DefaultAuthenticator.authenticate(DefaultAuthenticator.java:32) at com.mongodb.connection.InternalStreamConnectionInitializer.authenticateAll(InternalStreamConnectionInitializer.java:122) at com.mongodb.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:52) at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:127) at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:114) at java.lang.Thread.run(Thread.java:748) Caused by: com.mongodb.MongoCommandException: Command failed with error 18: 'Authentication failed.' on server HIDDEN-SAFETY. The full response is { "operationTime" : { "$timestamp" : { "t" : 1566160216, "i" : 1 } }, "ok" : 0.0, "errmsg" : "Authentication failed.", "code" : 18, "codeName" : "AuthenticationFailed", "$clusterTime" : { "clusterTime" : { "$timestamp" : { "t" : 1566160216, "i" : 1 } }, "signature" : { "hash" : { "$binary" : "uwH/Dl+sK7tJdD/bxIejcXmhnLs=", "$type" : "00" }, "keyId" : { "$numberLong" : "6712027632940089345" } } } } at com.mongodb.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:164) at com.mongodb.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:295) at com.mongodb.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:255) at com.mongodb.connection.CommandHelper.sendAndReceive(CommandHelper.java:84) at com.mongodb.connection.CommandHelper.executeCommand(CommandHelper.java:34) at com.mongodb.connection.SaslAuthenticator.sendSaslStart(SaslAuthenticator.java:119) at com.mongodb.connection.SaslAuthenticator.access$000(SaslAuthenticator.java:39) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:52) ... 9 common frames omitted 18-08-2019 23:30:18.487 [INFO ] iec-stats-custom, cluster-ClusterId{value='5d59b55a129d951bc4a931af', description='null'}-HIDDEN, org.mongodb.driver.cluster - Exception in monitor thread while connecting to server HIDDEN com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=null, userName='HIDDEN-NAME', source='logging-custom-test', password=, mechanismProperties={}} at com.mongodb.connection.SaslAuthenticator.wrapException(SaslAuthenticator.java:162) at com.mongodb.connection.SaslAuthenticator.access$200(SaslAuthenticator.java:39) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:68) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:46) at com.mongodb.connection.SaslAuthenticator.doAsSubject(SaslAuthenticator.java:168) at com.mongodb.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:46) at com.mongodb.connection.DefaultAuthenticator.authenticate(DefaultAuthenticator.java:32) at com.mongodb.connection.InternalStreamConnectionInitializer.authenticateAll(InternalStreamConnectionInitializer.java:122) at com.mongodb.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:52) at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:127) at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:114) at java.lang.Thread.run(Thread.java:748) Caused by: com.mongodb.MongoCommandException: Command failed with error 18: 'Authentication failed.' on server HIDDEN. The full response is { "operationTime" : { "$timestamp" : { "t" : 1566160216, "i" : 1 } }, "ok" : 0.0, "errmsg" : "Authentication failed.", "code" : 18, "codeName" : "AuthenticationFailed", "$clusterTime" : { "clusterTime" : { "$timestamp" : { "t" : 1566160216, "i" : 1 } }, "signature" : { "hash" : { "$binary" : "uwH/Dl+sK7tJdD/bxIejcXmhnLs=", "$type" : "00" }, "keyId" : { "$numberLong" : "6712027632940089345" } } } } at com.mongodb.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:164) at com.mongodb.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:295) at com.mongodb.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:255) at com.mongodb.connection.CommandHelper.sendAndReceive(CommandHelper.java:84) at com.mongodb.connection.CommandHelper.executeCommand(CommandHelper.java:34) at com.mongodb.connection.SaslAuthenticator.sendSaslStart(SaslAuthenticator.java:119) at com.mongodb.connection.SaslAuthenticator.access$000(SaslAuthenticator.java:39) at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:52) ... 9 common frames omitted Finalizer, called close() Finalizer, called closeInternal(true) Finalizer, called close() Finalizer, called closeInternal(true) 
submitted by nyawqabob to mongodb [link] [comments]

Attention Warlock Fashionistas

It's recently come to my attention that not everyone knows that the Warlock bonds, purchasable through the speaker, change color based on the time of day. In the interest of sharing knowledge and providing tactical wardrobe advantages, I've put together a compilation of images for your reference showing his wares at differing hours (each shot roughly ~12 minutes apart, over ten phases of the Tower's 2 hour day/night cycle). Because they don't stay the same color, it can be difficult to pair them with shaders but if you can find the right match, you get a really sweet dynamic outfit that evolves as the day progresses. Check it out!
Ulan Tan's Burial Ring
A replica of the legendary burial ring of Ulan-Tan.
http://imgur.com/a/YXCgK
This is my favorite Speaker bond, mostly because of the deep blood red that it turns at midday. I don't know anything about the lore behind it, sadly. Pairs well with Bloodpact, which is also one of my favorite shaders!
Five Lives of Albios
Woven to honor the last stand of Albios.
http://imgur.com/a/GpLUV
Another really pretty one, this turns vivid emerald around noon. Albios is the dude who shows up in the flavor text of the "Salacin Fen" armor set; he's apparently bit of a hippie who lived under a tree on the swamps of venus (for his fourth life? Sunsingethanatonaut?), before speaking to an Ahamkhara (cue ominous music) in his fifth life and never being seen again. Evidently, he has a "last stand" at some point as well. Pair with Broadsword if you can minimize the green camo print.
Binary Lazaus
Encrypted by the First Children at the Precipice of Flame, before the Exile.
http://imgur.com/a/o0Mc9
One of the more consistent color schemes. Dunno about the lore behind it, although "Exile" and "Precipice of Flame" COULD be a reference to Osiris. I like to wear this one with Electric Aquarius, because I'm basic.
Spirit of the Vulture
Before grace, subsistence. Before nobility, survival.
http://imgur.com/a/MRqZF
This one has some pretty huge color variance. The purple in particular is rather intense. This makes it harder to pair with shaders, but hot damn this bond looks amazing. Anything dark will put this front and center of your look, where it belongs.
Seal of the Twin Eagles
Only the wind beneath you.
http://imgur.com/a/6nOZs
Red and blue look great together, as any Hollywood blockbuster will be happy to show you; but this one can be hard to work with due to the fact that the colors are never side by side. Yesternight is REALLY good, but any shader that is purple, red or blue would work here; consider Vena Cava, Bone Marrow, or Atlantean 5055.
Harlequin Pendulum
A curious device, sought after by the Gensym Scribes.
http://imgur.com/a/JlVj1
I have no idea what a Gensym Scribe is, or how the heck they haven't found this bond yet (it's not like the Speaker has been terribly busy for the last two years) but it certainly is nice. Pair with The Ointment, Chanson de Geste, or Electric Aquarius...although truthfully there aren't many options that go well with this bond's teal mid-tones.
Union of the Consensus
A symbol of union worn by chosen Warlocks in the great Consensus.
http://imgur.com/a/a5XEV
Lots of pretty pastels! The Consensus is the current governing body of the City, comprised of the three factions and led by the Speaker. Incredibly, this goes really well with Sparklepony.
White Polygon Construct
A strange holographic bond. The information within describes something vast.
http://imgur.com/a/QC0QX
Yaaawn. By far the most boring of the eight. Pair with Chatterwhite, or better yet pair with a different bond in your class item slot.
I hope you enjoyed checking these out, and will consider adding some of them to your fashion repertoire—it's worth noting that the holograms have flowing textures, and look much better in-game than they ever could in a screenshot. As a Hunter main, I'll always prefer my cloaks but I feel like people talk smack about Warlock bonds without acknowledging that some of them are really, really cool. Bungie has some incredibly skilled artists and it's awesome that we get to inhabit the world they created.
BONUS ROUND: It's the epitome of unnoticed art, but I love the detail on the bands of the bonds themselves, even though they're small and often obscured by the arm itself. Take a look:
http://imgur.com/a/yv6em
submitted by justin_bailey_prime to DestinyTheGame [link] [comments]

Database management systems comparison

Database management systems comparison
https://preview.redd.it/8dgc1d2myxe21.jpg?width=1230&format=pjpg&auto=webp&s=7a9b4c0e866a00e764444b5863768e1f077d56dd
Nowadays, it is quite difficult to imagine any application that would not use the database whether it is a server, personal computer or mobile device. Database usage is widespread - from simple games to serious business applications of international corporations. They all process, read and write a specific set of data. Each system supports different database models and structures. These models determine how the created DBMS will operate with data. There are quite a few database models that provide ways to structure data and now we would like to represent the most popular solutions of this industry in comparison with an immutable and replicable Credits Database based on Key=Value (NoSQL) principles.

MongoDB
MongoDB is an open source database management system (DBMS) that uses a document-oriented database model which supports various forms of data. It is one of numerous nonrelational database technologies which arose in the mid-2000s under the NoSQL banner for the use in big data applications and other processing jobs involving data that doesn't fit well in a rigid relational model. Instead of using tables and rows as in relational databases, the MongoDB architecture is made up of collections and documents.

MySQL
MySQL is an Oracle-backed open source relational database management system (RDBMS) based on Structured Query Language (SQL). MySQL runs on virtually all platforms, including Linux, UNIX and Windows. Although it can be used in a wide range of applications, MySQL is most often associated with web applications and online publishing.

Oracle DB
Oracle database (Oracle DB) is a relational database management system (RDBMS) from the Oracle Corporation.The system is built around a relational database framework in which data objects may be directly accessed by users (or an application front end) through structured query language (SQL). Oracle is a fully scalable relational database architecture and is often used by global enterprises, which manage and process data across wide and local area networks. The Oracle database has its own network component to allow communications across networks.

Credits Blockchain DataBase (DBMS)
Credits Blockchain database system is a data storage system based on the blockchain technology (data is packed into blocks and all blocks are interconnected, which generates a chain of blocks) This technology allows for immutability and high reliability of data. The toolkit allows you to create the desired data format that will be stored in the database easily and quickly. The storage is highly optimized, which makes it possible to reach high read / record speeds. The support of native data compression is built-in to the storage, which helps to achieve the reduction of the necessary storage resources (LZ4 algorithm). The storage is an array with data represented in the form of Key, Value. That allows you to achieve high speed of read / write / search of the necessary data by key.

Primary database model

MongoDB
Mongo DB is a document-oriented database system, characterized by their schema-free organization of data.That means:
  • Records do not need to have a uniform structure, i.e. different records may have different columns.
  • The types of the values of individual columns can be different for each record.
  • Columns can have more than one value (arrays).
  • Records can have a nested structure.
MySQL, Oracle DB
MySQL, Oracle use relational database management system (RDBMS) model thats supports the relational (=table-oriented) data model. The scheme of a table (=relation schema) is defined by the table name and a fixed number of attributes with fixed data types. A record (=entity) corresponds to a row in the table and consists of the values of each attribute. A relation thus consists of a set of uniform records.
The table schemas are generated by normalization in the process of data modeling.
Certain basic operations are defined on the relations:
  • Classical set operations (union, intersection and difference)
  • Selection (selection of a subset of records according to certain filter criteria for the attribute values)
  • Projection (selecting a subset of attributes / columns of the table)
  • Join: special conjunction of multiple tables as a combination of the Cartesian product with selection and projection.
Credits Blockchain DataBase (DBMS)
The Credits Blockchain DataBase model is very simple. It is a structured data with a pronounced structure of key and data (the key can be a composite or perform some characterizing function, the result of which is a unique representation of the data set in the Value field). The system has no SQL language, which affects the need to use third-party search and data retrieval techniques. The database is a NoSQL solution, which allows to abandon the relational interactions between the stored data and achieve the speed comparable with the speed of work with the file system.

Supported programming languages

Mongo DB
Actionscript, C, C#, C++, Clojure, ColdFusion, D,Dart, Delphi, Erlang, Go, Groovy, Haskell, Java, JavaScript, Lisp, Lua, MatLab, Perl, PHP, PowerShell.
MySQL
Ada, C, C#, C++, D, Delphi, Eiffel, Erlang, Haskell, Java, JavaScript (Node.js), Objective-C, OCaml, Perl, PHP, Python, Ruby, Scheme, Tcl.
Oracle DB
C, C#, C++, Clojure, Cobol, Delphi, Eiffel, Erlang, Fortran, Groovy, Haskell, Java, JavaScript, Lisp, Objective C, OCaml, Perl, PHP, Python, R, Ruby, Scala, Tcl, Visual Basic.
Credits Blockchain DataBase (DBMS)
The system supports С / С ++ and similar languages at the native level. SDK is used to work with all languages is developed for the needs of the DBMS. This allows to achieve unification and standardization of interaction with the database and simplified integration with any other system.

Partitioning methods

Database technologies use different methods for data storage.
Mongo DB
Mongo DB implements sharding with best practices baked in. Sharding is a method for distributing data across multiple machines. MongoDB uses sharding to support deployments with very large data sets and high throughput operations.
Database systems with large data sets or high throughput applications can challenge the capacity of a single server. For example, high query rates can exhaust the CPU capacity of the server. Working set sizes larger than the system’s RAM stress the I/O capacity of disk drives.
MySQL
MySQL automatically partitions tables across nodes on the base of MySQL Cluster, which is a synchronous mostly memory-only key-value store that allows a shared-nothing architecture for MySQL (providing a backend to the NDB Engine). It provides automatic sharding, enabling databases to scale horizontally on low cost, commodity hardware to serve read and write-intensive workloads, accessed both from SQL and directly via NoSQL APIs.
Oracle DB
Oracle Partitioning method allows tables and indexes to be partitioned into smaller, more manageable units, providing database administrators with the ability to pursue a "divide and conquer" approach to data management. With partitioning, maintenance operations can be focused on particular portions of tables.
Credits Blockchain DataBase (DBMS)
Data is stored in an associative array according to the Key-Value principle. The value contains the complete data set, with the length and the type of stored information not limited. All data is stored in binary format. InMemory principle is used for system performance.

Replication methods

Some of the common reasons for using replication are:
Availability. Replication improves the availability of applications because it provides them with alternative data access options. If one site becomes unavailable, users can continue to query or even update the remaining locations. In other words, replication provides excellent failover protection.
Performance. Replication provides fast, local access to shared data because it balances activity over multiple sites. Some users can access one server while other users access other servers, thereby reducing the load at all servers. Also, users can access data from the replication site that has the lowest access cost, which is typically the site that is geographically closest to them.
Disconnected Computing. A snapshot is a complete or partial copy (replica) of a target master table from a single point in time. Snapshots enable users to work on a subset of a database while disconnected from the central database server. Later, when a connection is established, users can synchronize (refresh) snapshots on demand. When users refresh snapshots, they update the central database with all of their changes, and they receive any changes that may have happened while they were disconnected.
Network Load Reduction. Replication can be used to distribute data over multiple regional locations. Then, applications can access various regional servers instead of accessing one central server. This configuration can reduce network load dramatically.

Mongo DB
The master-slave replication is the oldest mode of replication that MongoDB supports. In the earlier versions of MongoDB, the master-slave replication was used for failover, backup, and read scaling. However, in the new versions, it is replaced by replica sets for most use cases.
MySQL
MySQL supports 2 modes of replication as master-slave and master - master replication types. The first one is used on the base of the same principles described above. MySQL Master-Master replication adds speed and redundancy for active websites. With replication, two separate MySQL servers act as a cluster. Database clustering is particularly useful for high availability website configurations.
Oracle DB
Oracle replication supports the following types of replication environments:
  • Multimaster Replication (Multimaster replication (also called peer-to-peer or n-way replication) allows multiple sites, acting as equal peers, to manage groups of replicated database objects. Each site in a multimaster replication environment is a master site);
  • Snapshot Replication (A snapshot contains a complete or partial copy of a target master table from a single point in time. A snapshot may be read-only or updateable);
  • Multimaster and Snapshot Hybrid Configurations (Multimaster replication and snapshots can be combined in hybrid or "mixed" configurations to meet different application requirements. Mixed configurations can have any number of master sites and multiple snapshot sites for each master).
Credits Blockchain DataBase (DBMS)
The system is a self-sufficient storage node, but it is possible that the system can be represented by two or more repositories with full replication of data among all storage nodes. Synchronization between nodes occurs at the native low level after each block has transferred at the united storage network. This native synchronization method is a priority and more fault tolerant than all other systems since there is no storage master, which must save data firstly and then spend resources on data cloning. Even in case of one of the repositories fails, the network protocol will automatically redistribute the load on other nodes and data will not be lost. If one of the disconnected nodes enters the storage network again, then the process of the missing blocks synchronization will be launched with obtaining the basic information in real time mode.

Transaction concepts

Mongo DB
The transaction functionality introduced by MongoDB supports multi-document ACID features such as transaction operations using the mongo shell, making it the only open source database to combine the speed, flexibility, and power of the document model with ACID guarantees. Through snapshot isolation, transactions provide a consistent view of data, and enforce all-or-nothing execution to maintain data integrity.
MySQL, Oracle DB
MySQL and Oracle DBs support transactions that have the following four standard properties, usually referred to by the acronym ACID:
  • Atomicity ensures that all operations within the work unit are completed successfully; otherwise, the transaction is aborted at the point of failure, and previous operations are rolled back to their former state;
  • Consistency ensures that the database properly changes states upon a successfully committed transaction;
  • Isolation enables transactions to operate independently of and transparent to each other;
  • Durability ensures that the result or effect of a committed transaction persists in case of a system failure.
Credits Blockchain DataBase (DBMS)
The distribution of data is performed by the use of a network protocol based on UDP protocol with transfer confirmation. The first step is block generation. After that all data is converted to basic transfer units like datagram. The formed datagram is transferred to the network where the recipient should confirm data acquisition. This is how the data transaction concept in Credits Blockchain DataBase looks like.

Type of License

Mongo DB
Public License. Prior versions were published under GNU AGPL v3.0. Commercial licenses are also available.
MySQL
Commercial licenses with extended functionality are available.
Oracle DB
Restricted free version is available.
Credits Blockchain DataBase (DBMS)
Restricted free and commercial versions of system are available .
submitted by a_andrey1 to CreditsOfficial [link] [comments]

Modulation World: Deep Learning about the Difference between Analog and Digital Modulation | Soukacatv.com

Modulation World: Deep Learning about the Difference between Analog and Digital Modulation | Soukacatv.com
Difference between Analog and Digital Modulation
Analog vs. Digital Modulation
Modulation is the process of modifying one signal based on another, and it is used mostly in the transmission of data from one point to another. Although there are many types of modulation, there are two basic types: analog modulation and digital modulation. The main difference between analog modulation and digital modulation is in the manner that they transmit data. With analog modulation, the input needs to be in the analog format, while digital modulation needs the data in a digital format.
HDMI Encoder Modulator, 16in1 Digital Headed, HD RF Modulator at Digital and Analog modulator manufacturer from Soukacatv.com

Analog modulator manufacturer from Soukacatv.com
Because of the differences in the input signal, the output signal is also quite different. In analog modulation, any value between the maximum and minimum is considered to be valid. It is not so with digital modulation as only two values are considered valid; one value to represent “1” and another to represent “0.” All other values are considered noise and are rejected.
Because most signals that we transmit are analog in nature, like one’s voice, it is far simpler to do analog modulation than digital. If you want to transmit a voice using digital modulation, you’d need to pass it through an analog-to-digital converter before transmission and a digital-to-analog converter at the receiver to recover the original signal. The additional stages needed for transmitting digital modulation increases both the cost and complexity of the transmitter and receiver.
The major advantage that digital modulation has over analog transmission is how it achieves greater fidelity. With analog modulation, any noise or interference that falls in the given frequency bandwidth gets mixed with the actual signal. Although there are a number of ways to mitigate noise, it will still cause some amount of degradation. Because digital modulation only recognizes 0’s and 1’s, any noise is virtually eliminated once the receiver discerns whether a “0” or a “1” was transmitted. Unless the signal is very badly distorted, the output signal will be literally identical to what was transmitted.
Under both analog modulation and digital modulation, there are a number of other modulation techniques each with its own strengths and weaknesses. But each technique has its basic commonalities of transmitting either a digital or analog signal.
Summary:
  1. Analog modulation takes an analog signal while digital mod
  2. ulation takes a digital signal.
    1. Analog modulation has a range of valid values while digital modulation only has two.
    2. Analog modulation is cheaper to implement than digital modulation.
    3. Digital modulation produces more accurate output than analog modulation.
Difference between Analog and Digital Signals
Analog vs. Digital Signals
There are two types of signals that carry information – analog and digital signals. The difference between analog and digital signals is that analog is a continuous electrical signal, whereas digital is a non-continuous electrical signal.
Analog Signals vary in time, and the variations follow that of the non-electric signal. When compared to analog signals, digital signals change in individual steps and consist of pulses or digits. Analog signals are a model of the real quantity and the voice intensification that causes electric current variations. Digital signals have discrete levels, and the specified value of the pulse remains constant until the change in the next digit. There are two amplitude levels, which are called nodes, which are based on 1 or 0, true or false, and high or low.
Digital signals, similar to Morse code, are sent to a computer which interprets these into words. A digital signal, a 0 or 1, is sent through the phone line. For example, when you type the letter A into your computer, it converts it into 01000001. This 01000001 goes to other computer, which interprets it as A. A series of eight 0’s and 1’s is called a byte, whereas each 0 or 1 is called a bit.
The difference between digital and analog signals can also be understood by observing various examples of different waves, and how they work. In the 1800’s, analog waveforms were used in conjunction with copper to relay or transmit conversations. Since they have the tendency to catch distorting electromagnetic waves, or noise which drops the quality of the signal, they soon became troublesome and difficult to maintain. Soon the change from analog to digital occurred, because digital signals were easier to transmit and were more reliable compared to analog signals.
A signal is the transmission of data that we constantly deal with during our daily routine life. From telephones to cellular devices, and music to computers, signals are very important. With the advent of modern technology, telephone and computers etc. have become a necessity, and the cost of analog signal transmission has become not only expensive, but troublesome. Digital signals soon replaced analog because they are simply different and uniformed, and not severely altered by noise or distortion. Almost all electronic devices use digital signals, because they remain accurate in shape and amplitude. Digital signals provide better continuous delivery, and are preferred over analog signals.
Summary:
  1. Analog signals can be converted into digital signals by using a modem.
  2. Digital signals use binary values to send and receive data between computers.
  3. Digital signals are easier and more reliable to transmit with fewer errors.
  4. Analog signal are replicas of sound waves that can be distorted with noise and drop the quality of transmission.
  5. Digital data has a faster rate of transmission when compared to analog, and gives better productivity.
Difference between Analog and Digital Transmission
Analog vs. Digital Transmission
Analog transmission is a method of conveying voice, data, image, signal, or video information. It uses a continuous signal varying in amplitude, phase, or another property that is in proportion to a specific characteristic of a variable. Analog transmission could mean that the transmission is a transfer of an analog source signal which uses an analog modulation method (or a variance of one or more properties of high frequency periodic waveform, also known as a carrier signal). FM and AM are examples of such a modulation. The transmission could also use no modulation at all. It is most notably an information signal that is constantly varying.
Data transmission (also known as digital transmission or digital communications) is a literal transfer of data over a point to point (or point to multipoint) transmission medium –such as copper wires, optical fibers, wireless communications media, or storage media. The data that is to be transferred is often represented as an electro-magnetic signal (such as a microwave). Digital transmission transfers messages discretely. These messages are represented by a sequence of pulses via a line code. However, these messages can also be represented by a limited set of wave forms that always vary. Either way, they are represented using a digital modulation method.
Analog transmission is capable of being conveyed in a no fewer than four ways: through a twisted pair or coax cable, through a fiber optic cable, through the air, or through water. There are, however, only two basic types of analog transmission. The first is known as amplitude modulation (or AM). This is a technique used in electronic communication and works by alternating the strength of a transmitted signal in relation to the information that is being sent. The second is known as frequency modulation (or FM). This type of communication conveys information over a carrier wave, just as AM transmission. However, FM communication alternates the frequency of the transmitted signal.
Data that is transmitted via digital transmission may be digital messages that have origins for a data source (a computer or a keyboard, for example). However, this transmitted data may also be from an analog signal (a phone call or a video signal, for example). It may then be digitized into a bit stream using pulse code modulation (or PCM) –or even more advanced source coding schemes. The coding of the data is carried out using codec equipment.
Summary: 1. Analog transmission conveys voice, data, image, signal, or video information using an information signal that is continuously varying; digital transmission transfers data over a transmission medium discretely. 2. Analog transmission can be conveyed in four ways: a twisted pair or coax cable, a fiber optic cable, the air, or water; digital transmission may be transmitted via an electro-magnetic signal, such as a microwave.
Difference between Analog and Digital
Analog vs. Digital
Technologically speaking analog and digital are two kinds of processes used for the transmission of any  electric signals. A Usually the information which transformed into electric signal is either audio or video. This is done via the translation of any information into different types of electric signals. For the analog format, the translation of data is in electric pulses  which varies in amplitude while for the digital format, the translation of data is in the binary format with two distinct amplitudes represent each bit.
Devices come with built-in ‘translation’ facilities so you have equipment like analog or digital phones, fax machines, modems, clocks, watches etc. A microphone and speaker are good examples for analog devices.
Analog technology is older and has been used for decades. It is cheap too but the problem with analog signals is that there is a limitation on the size of the data that can be transmitted at any given point of time.
Digital technology has changed how most of our equipment works. It changes all data into binary code at the point of transmission and this binary code is reassembled back into data as original at the reception point of the transmission. Since digital signals can be manipulated by software, it gives you way more options than an analog one. In telecommunication, as compared to analog signals since digital signals have an original blueprint that has to be replicated at the conclusion point of the transmission, it is more accurate and clear.
However, another difference between the digital and analog technology is that of quality. Since digital devices are translating and reassembling data, the quality is not that good.  But advancement in computing technology allows to artificially remove possible errors and disturbances in  any digital signals. Digital is still quite expensive as compared to the analog one. Global technology giants are working on reducing the price though.
The most efficient use of the digital technology has been realized in the cellular phone industry with analog becoming redundant though the sound quality is better in the latter. It can be said that all natural signals are analog. For instance when human speech is transformed directly to electric signals it is an analog signal. But converting it to digital format opens up an endless possibility of usage, Â like a simple act of saving that in a computer. Established in 2000, the Soukacatv.com main products are modulators both in analog and digital ones, amplifier and combiner. We are the very first one in manufacturing the headend system in China. Our 16 in 1 and 24 in 1 now are the most popular products all over the world.
For more, please access to https://www.soukacatv.com.
CONTACT US
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Company Address: Building A, the first industry park of Guanlong, Xili Town, Nanshan, Shenzhen, Guangdong, China
Tel: +86 0755 26909863
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This section explains startup options for controlling replication slave servers. Many of these options can be set while the server is running by using the CHANGE MASTER TO statement. Others, such as the --replicate-* options, can be set only when the slave server starts. Replication-related system variables are discussed later in this section. When binary logging is enabled on a replica, the combination of the --replicate-same-server-id and --log-slave-updates options on the replica can cause infinite loops in replication if the server is part of a circular replication topology. (In MySQL 8.0, binary logging is enabled by default, and replica update logging is the default when binary For a replica set, specify the hostname(s) of the mongod instance(s) For more information on which options your driver supports and their relative priority to each other, reference the documentation for your preferred driver version. The standard binary representation. csharpLegacy The default representation for the C# driver. To set the binary logging format for a MySQL or MariaDB database, Amazon RDS DB instance, use the --host, --user (-u), --port and -p options in the mysql command. The host name is the Domain Name Service When you set up an external source instance and a replica on Amazon RDS, monitor failover events for the Amazon RDS DB instance that This section explains startup options for controlling replica servers. Many of these options can be set while the server is running by using the CHANGE MASTER TO statement. Others, such as the --replicate-* options, can be set only when the replica server starts. Replication-related system variables are discussed later in this section.

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