May 20, 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: , , , , , , ,

MySQL 5.6 Compatible Percona Toolkit 2.2 Released

March 25, 2013 By 2 Comments

A new Percona Toolkit series has been released: Percona Toolkit 2.2 for MySQL 5.6. Several months in the making and many new features, changes, and improvements make this a great new series. It replaces the 2.1 series for which we plan to do only one more bug fix release (as 2.1.10) then retire. 2.2 is [...]

Filed Under: Percona Software, Percona Toolkit Tagged With: , , , , ,

Implications of Metadata Locking Changes in MySQL 5.5

February 1, 2013 By 9 Comments

While most of the talk recently has mostly been around the new changes in MySQL 5.6 (and that is understandable), I have had lately some very interesting cases to deal with, with respect to the Metadata Locking related changes that were introduced in MySQL 5.5.3. It appears that the implications of Metadata Locking have not [...]

Filed Under: Insight for DBAs, Insight for Developers, 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: , ,

Sphinx search performance optimization: attribute-based filters

January 15, 2013 By 9 Comments

One of the most common causes of a poor Sphinx search performance I find our customers face is misuse of search filters. In this article I will cover how Sphinx attributes (which are normally used for filtering) work, when they are a good idea to use and what to do when they are not, but [...]

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

Profiling MySQL Memory Usage With Valgrind Massif

January 9, 2013 By 1 Comment

There are times where you need to know exactly how much memory the mysqld server (or any other program) is using, where (i.e. for what function) it was allocated, how it got there (a backtrace, please!), and at what point in time the allocation happened. For example; you may have noticed a sharp memory increase [...]

Filed Under: Insight for DBAs, Insight for Developers, MySQL, Quality Assurance

MySQL Wish for 2013 – Better Memory Accounting

December 31, 2012 By 6 Comments

With Performance Schema improvements in MySQL 5.6 I think we’re in the good shape with insight on what is causing performance bottlenecks as well as where CPU resources are spent. (Performance Schema does not accounts CPU usage directly but it is something which can be relatively easily derived from wait and stage information). Where we’re [...]

Filed Under: Insight for DBAs, Insight for Developers, MySQL, Quality Assurance

How to obtain the “LES” (Last Executed Statement) from an Optimized Core Dump?

September 9, 2012 By 9 Comments

Ever ran into a situation where you saw “some important variable you really needed to know about=<optimized out>” while debugging?

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

Distro Packages, Pre-built Binaries or Compile Your Own MySQL

September 4, 2012 By 7 Comments

I’ve been helping customers deploy and maintain MySQL (and variants) for the last couple of years and it has always been interesting to hear customer thoughts on how they want their servers installed. It has also been asked many times not only by our support and consulting customers, but widely from different forums and blogs [...]

Filed Under: MySQL

A case for MariaDB’s Hash Joins

May 31, 2012 By Leave a Comment

MariaDB 5.3/5.5 has introduced a new join type “Hash Joins” which is an implementation of a Classic Block-based Hash Join Algorithm. In this post we will see what the Hash Join is, how it works and for what types of queries would it be the right choice. I will show the results of executing benchmarks [...]

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