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Displaying posts with tag: mongodb (reset)
Throttling writes: LSM vs B-Tree

Reducing response time variance is important for some workloads. This post explains sources of variance for workloads with high write rates when the index structure is an LSM or a B-Tree. I previously wrote about this in my post on durability debt.

Short summary:

  1. For a given write rate stalls are more likely with a B-Tree than an LSM
  2. Many RocksDB write stalls can be avoided via configuration
  3. Write stalls with a B-Tree are smaller but more frequent versus an LSM
  4. Write stalls are more likely when the redo log isn't forced on commit
  5. The worst case difference between an LSM and B-Tree is larger when the working set isn't cached
  6. Life is easier but more expensive when the working set …
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The joy of database configuration

I am wary of papers with performance results for too many products.Too many means including results from systems for which you lack expertise. Wary means I have less faith in the comparison even when the ideas in the paper are awesome. I have expertise in MySQL, MongoDB, RocksDB, WiredTiger and InnoDB but even for them I have made and acknowledged ridiculous mistakes.

Database configuration is too hard. There are too many options, most of them aren't significant and the approach is bottom-up. I an expert on this -- in addition to years of tuning I have added more than a few options to RocksDB and MySQL.

This post was motivated by PostgreSQL. I want to run the insert benchmark for it and need a good configuration. I have nothing against PG with the exception of a few too many why …

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Database Tab Sweep

I miss a proper database related newsletter for busy people. There’s so much happening in the space, from tech, to licensing, and even usage. Anyway, quick tab sweep.

Paul Vallée (of Pythian fame) has been working on Tehama for sometime, and now he gets to do it full time as a PE firm, bought control of Pythian’s services business. Pythian has more than 350 employees, and 250 customers, and raised capital before. More at Ottawa’s Pythian spins out software platform Tehama.

Database leaks data on most of Ecuador’s citizens, including 6.7 million children – ElasticSearch.

Percona has …

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5th Mydbops Database Meetup (Saturday, 2nd of Nov. 2019)

We are fueled and energized by the inquisitiveness and eagerness of Database Administrators as a community, reminding us of conducting the next edition of Mydbops Database Meetup. The regular attendees are now looking forward to this quarterly meetup organized by Mydbops, for the benefit of its participants, with the latest hands-on knowledge being shared by the practitioners themselves.

This time we are back in to Diamond District as the venue for this edition of 5th Mydbops Database Meetup, even though, the place of the meeting will be in a different Tower within the same campus at Gojek Tech, Diamond District, 4th Floor, Tower ‘B’, HAL Road, Bangalore – 560 008.

Mydbops Database Meetup

Bangalore, IN
175 Members

Let us meet together at Mydbops Database Conference. This …

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Open Source India(OSI) 2019 & Mydbops

Since three years of our entity’s progression, Mydbops IT Solutions, Bangalore, have been an active participant of Open Source India (OSI) conference, conducted by Open Source For You Magazine which is part of EFY Group, New Delhi.

This annual event is an attempt by the team at Open Source For You magazine in partnership with India’s Open Source community and industry—to bring various stake-holders under one roof. The mission of OSI is simple—to accelerate development and deployment of Open Source in India, and beyond.

This year our floor presence has been shifted to the Entry Bay itself, contrasting from our previous presence at the sides of an Auditorium. This position is alongside the IT bigwig like, Microsoft. This development, show cases strides made in the past …

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Join Pythian for Percona Live Europe 2019 Amsterdam

Percona Live is always a great opportunity to learn from the best and brightest in the open-source database community. This time, Percona Live Europe is being held at the Hilton Amsterdam Airport Schiphol, The Netherlands from September 30 to October 2, 2019.

Pythian will be present, as has been the case for the past few years, with some of our technical experts speaking on a variety of subjects and technologies.

Feel free to ping any of us during the conference breaks or community events, as we’ll be happy to answer any questions you have about anything open source, cloud, or data-related.

Here are some sessions you won’t want to miss:

Wednesday, October 2

9:00 AM – …

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Percona Toolkit 3.1.0 Is Now Available

Percona announces the release of Percona Toolkit 3.1.0 on September 13, 2019.

Percona Toolkit is a collection of advanced open-source command-line tools, developed and used by the Percona technical staff, that are engineered to perform a variety of MySQL®, MongoDB®, PostgreSQL® and system tasks that are too difficult or complex to perform manually. With over 1,000,000 downloads, Percona Toolkit supports Percona Server for MySQL, MySQL, MariaDB, PostgreSQL, Percona Server for MongoDB, and MongoDB.

Percona Toolkit, like all Percona software, is free and open source. You can download packages  …

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Adapting TPC-C for MongoDB - reviewing a VLDB paper

This is a review of Adapting TPC-C Benchmark to Measure Performance of Multi-Document Transactions in MongoDB which was published in VLDB 2019. I appreciate that MongoDB and Asya Kamsky took the time to get this published. That can be a weekend and nights project when in industry. I also appreciate that this not a benchmarketing effort. The purpose wasn't to overstate performance. The purpose was to show how to get good performance on a TPC-C like workload with MongoDB and realistic hardware and configurations. I hope for a similar effort on MongoDB with Linkbench.

My comments:

  • Work was done to reduce write-write conflicts which will be more likely given the extra commit latency from using w:majority writeConcern on a 3-node cluster. That …
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Tunable Consistency in MongoDB - reviewing a VLDB paper

This is a review of Tunable Consistency in MongoDB from VLDB 2019. It is worth reading and I appreciate that MongoDB has recently published several conference papers. I am not an expert on this topic. For expertise see Daniel Abadi, Kyle Kingsbury and Peter Bailis. Henrik can be added to the list with a few more blog posts.

MongoDB vs MySQL

MongoDB is a NoSQL DBMS that makes it easy to run sharded replicasets. While the NoSQL part of it is nice the sharded replicaset part of it is amazing. I hope that MySQL eventually gets similar …

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4th Mydbops Database Meetup

Partnering to participate knowledge sharing for the community of Database Administrators.

In continuation to the community contribution with knowledge gained out of experience and networking, Mydbops IT Solutions, conducted its 4th Database Meetup on Saturday, 3rd of August, 2019. Here was the first time, that we had changed our venue. With the like-minded sponsor in M/s.Zenefits Technologies India Pvt. Ltd. They played a role of a perfect host for all of us as attendees. Their venue was a perfectly equipped to suit the knowledge sharing exercise.

Key note by Mr.Ramesh Aithal, Head of Engineering at Zenefits was build on statistics, of how the Industry is taking shape and the galore of opportunities in the coming days. The attendees from multiple companies were a great …

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