May 19, 2013

Virident vCache vs. FlashCache: Part 2

May 17, 2013 By 3 Comments

This is the second part in a two-part series comparing Virident’s vCache to FlashCache. The first part was focused on usability and feature comparison; in this post, we’ll look at some sysbench test results. Disclosure: The research and testing conducted for this post were sponsored by Virident. First, some background information. All tests were conducted [...]

Filed Under: Benchmarks, Hardware and Storage, MySQL Tagged With: , , , , , , ,

Virident vCache vs. FlashCache: Part 1

May 16, 2013 By 3 Comments

(This is part one of a two part series) Over the past few weeks I have been looking at a preview release of Virident’s vCache software, which is a kernel module and set of utilities designed to provide functionality similar to that of FlashCache. In particular, Virident engaged Percona to do a usability and feature-set [...]

Filed Under: Benchmarks, Hardware and Storage, MySQL Tagged With: , , , , ,

Galera Flow Control in Percona XtraDB Cluster for MySQL

May 2, 2013 By 5 Comments

Last week at Percona Live, I delivered a six-hour tutorial about Percona XtraDB Cluster (PXC) for MySQL.  I actually had more material than I covered (by design), but one thing I regret we didn’t cover was Flow control.  So, I thought I’d write a post covering flow control because it is important to understand. What [...]

Filed Under: Insight for DBAs, Percona Live, XtraDB Cluster Tagged With: , , ,

Percona Server 5.5.30-30.2 rerelease fixes non-restart issue

April 24, 2013 By Leave a Comment

In our last 5.5 series release of Percona Server, we included a regression in the RPM packaging that prevented the server from restarting following an upgrade — instead, the server would remain stopped after the upgrade was completed regardless of its state before updating. This caused some problems for some users, especially if automatic upgrading was configured [...]

Filed Under: MySQL, Percona Software

The write cache: Swap insanity tome III

April 19, 2013 By 5 Comments

Swapping has always been something bad for MySQL performance but it is even more important for HA systems. It is so important to avoid swapping with HA that NDB cluster basically forbids calling malloc after the startup phase and hence its rather complex configuration. Probably most readers of this blog know (or should know) about [...]

Filed Under: Hardware and Storage, Insight for DBAs, MySQL Tagged With: , , ,

MySQL performance: Impact of memory allocators (Part 2)

March 8, 2013 By 12 Comments

Last time I wrote about memory allocators and how they can affect MySQL performance in general. This time I would like to explore this topic from a bit different angle: What impact does the number of processor cores have on different memory allocators and what difference we will see in MySQL performance in this scenario? [...]

Filed Under: Benchmarks, MySQL Tagged With: , , ,

InnoDB Full-text Search in MySQL 5.6: Part 2, The Queries!

March 4, 2013 By 7 Comments

This is part 2 in a 3 part series. In part 1, we took a quick look at some initial configuration of InnoDB full-text search and discovered a little bit of quirky behavior; here, we are going to run some queries and compare the result sets. Our hope is that the one of two things [...]

Filed Under: Insight for DBAs, Insight for Developers, MySQL Tagged With: , , , , ,

MySQL 5.5 and MySQL 5.6 default variable values differences

February 21, 2013 By 8 Comments

As the part of analyzing surprising MySQL 5.5 vs MySQL 5.6 performance results I’ve been looking at changes to default variable values. To do that I’ve loaded the values from MySQL 5.5.30 and MySQL 5.6.10 to the different tables and ran the query:

Lets go over to see what are the most important changes [...]

Filed Under: Insight for DBAs, MySQL Tagged With: , , ,

Can’t Create Thread: Errno 11 (A Tale of Two Ulimits)

February 4, 2013 By 10 Comments

Recently some of my fellow Perconians and I have noticed a bit of an uptick in customer cases featuring the following error message:

The canonical solution to this issue, if you do a bit of Googling, is to increase the number of processes / threads available to the MySQL user, typically by adding a [...]

Filed Under: Insight for DBAs, MySQL Tagged With: , ,

Read/Write Splitting with PHP Webinar Questions Followup

January 23, 2013 By 4 Comments

Today I gave a presentation on “Read/Write Splitting with PHP” for Percona Webinars.  If you missed it, you can still register to view the recording and my slides. Thanks to everyone who attended, and especially to folks who asked the great questions.  I answered as many as I could during the session, but here are [...]

Filed Under: Events and Announcements, Insight for Developers, MySQL Tagged With: , ,
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