This Thursday (September 24th, 14:00 UTC), Heikki Tuuri, the father of InnoDB, will give a session on Concurrency Control: How It Really Works. He'll describe how InnoDB manages concurrency control, so that the system protects data integrity. Beginning with the basics of transaction management, Heikki will include a discussion of the ACID (atomicity, consistency, isolation, and durability) properties, and explain various transaction modes, locking, deadlocks, and more advanced topics such as the impact of next-key (gap) locking, referential integrity, XA (distributed transaction management) support, and more. While the discussion will focus on the InnoDB implementation, many of the concepts presented apply to other database systems and storage engines.

For MySQL …

This Thursday (September 24th, 14:00 UTC), Heikki Tuuri, the father of InnoDB, will give a session on Concurrency Control: How It Really Works. He'll describe how InnoDB manages concurrency control, so that the system protects data integrity. Beginning with the basics of transaction management, Heikki will include a discussion of the ACID (atomicity, consistency, isolation, and durability) properties, and explain various transaction modes, locking, deadlocks, and more advanced topics such as the impact of next-key (gap) locking, referential integrity, XA (distributed transaction management) support, and more. While the discussion will focus on the InnoDB implementation, many of the concepts presented apply to other database systems and storage engines.

For MySQL …

This is sort of a self-documenting post, and a self-support group about ill-behaved tomcat apps. Sometimes, you have multiple nodes accesing your MySQL server (or any kind of server, for that matter) concurrently. Eventually, software in one or more of these nodes might do nasty things (you know who you are buddy:)) MySQL provides a … Continue reading iptables trick to limit concurrent tcp connections →

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One interesting and useful paper on real-world concurrency by Bryan Cantrill and Jeff Bonwick.

Abstract: In this look at how concurrency affects practitioners in the real world, Cantrill and Bonwick argue that much of the anxiety over concurrency is unwarranted. Most developers who build typical MVC systems can leverage parallelism by combining pieces of already concurrent software such as database and operating systems (i.e., concurrency through architecture), rather than by writing multithreaded code themselves. And for those who actually must deal with threads and locks, the authors include a helpful list of best practices to help minimize the pain.

One interesting and useful paper on real-world concurrency by Bryan Cantrill and Jeff Bonwick.

Abstract: In this look at how concurrency affects practitioners in the real world, Cantrill and Bonwick argue that much of the anxiety over concurrency is unwarranted. Most developers who build typical MVC systems can leverage parallelism by combining pieces of already concurrent software such as database and operating systems (i.e., concurrency through architecture), rather than by writing multithreaded code themselves. And for those who actually must deal with threads and locks, the authors include a helpful list of best practices to help minimize the pain.

Well, it took us a little while (we’ve been busy !), but we’ve now posted our presentations on InnoDB from the MySQL Conference and Expo 2009. You can download these presentations by Heikki Tuuri, Ken Jacobs and Calvin Sun from the InnoDB website, as follows:

• Ken and Heikki: InnoDB: Innovative Technologies for Performance and Data Protection
• Heikki: Crash Recovery and Media Recovery in InnoDB
…

Some months ago, Google released a patch for InnoDB that boosts performance on multi-core servers. We decided to incorporate the change into the InnoDB Plugin to make everybody happy: users of InnoDB don’t have to apply the patch, and Google no longer has to maintain the patch for new versions of InnoDB. And it makes us at Innobase happy because it improves our product (as you can in this post about InnoDB Plugin release 1.0.3).

However, there are always technical and business issues to address. Given the low-level changes in the patch, was it technically sound? Was the patch stable and as rock solid as is the rest of InnoDB? Although it was written for the built-in InnoDB in MySQL 5.0.37, we needed to adapt it to the InnoDB Plugin. Could we …

That should read “Talks, Talks, Talks” … There will be several presentations by InnoDB experts at the upcoming 2009 MySQL Conference and Expo. Whether you’re a newbie or an experienced DBA deeply familiar with InnoDB, you won’t want to miss these important talks about InnoDB:

• Innovative Technologies for Performance and Data Protection by Ken and Heikki, Tues, 11:55am
• Crash Recovery and Media Recovery in InnoDB by Heikki, Wed, 2pm
• InnoDB Internals: InnoDB File Formats & Source Code Structure by Heikki and Calvin, Wed, 5:15pm
• …

Why should you care about the latest “early adopter” release of the InnoDB Plugin, version 1.0.3?   One word: performance! The release introduces these features:

• Enhanced concurrency & scalability: the “Google SMP patch” using atomic instructions for mutexing
• More efficient memory allocation: ability to use more scalable platform memory allocator
• Improved out-of-the-box scalability: unlimited concurrent thread execution by default
• Dynamic tuning: at run-time, enable or disable insert buffering and adaptive hash indexing

These new performance features can yield up to twice the throughput or more, depending on your workload, platform and other tuning considerations. In another post, we explore some details about these changes, but first, what do these enhancements mean for performance and scalability?

In brief, we’ve …

tl;dr: The MySQL community rocks. Percona, XtraDB, Drizzle, SSD storage, InnoDB IO scalability challenges.

For anyone who lives and dies by MySQL and InnoDB, things are finally starting to heat up and get interesting. I’ve been banging the “MySQL/InnoDB scales poorly” drums for years now, and despite having paid Enterprise licenses, I haven’t been able to get anywhere. I was pretty excited when Sun …