Preparing for my talk for Percona MySQL University in Raleigh,NC, Tuesday 29th of January I have created the outline of improvements available in MySQL 5.6 which I thought was worth sharing to give a feel for how massive work have been done for this release in variety of areas. I’m sure the list is not [...]
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 [...]
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 [...]
Announcing Percona Server 5.5.28-29.3
January 8, 2013 By 2 Comments
Percona is glad to announce the release of Percona Server 5.5.28-29.3 on January 8th, 2012 (Downloads are available here and from the Percona Software Repositories). Based on MySQL 5.5.28, including all the bug fixes in it, Percona Server 5.5.28-29.3 is now the current stable release in the 5.5 series. All of Percona‘s software is open-source and free, all the details of the release can [...]
Percona Toolkit by example – pt-stalk
January 3, 2013 By 3 Comments
pt-stalk recipes: Gather forensic data about MySQL when a server problem occurs It happens to us all from time to time: a server issue arises that leaves you scratching your head. That’s when Percona Toolkit’s pt-stalk comes into play, helping you diagnose the problem by capturing diagnostic data that helps you pinpoint what’s causing the [...]
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 [...]
The Optimization That (Often) Isn’t: Index Merge Intersection
December 14, 2012 By 6 Comments
Prior to version 5.0, MySQL could only use one index per table in a given query without any exceptions; folks that didn’t understand this limitation would often have tables with lots of single-column indexes on columns which commonly appeared in their WHERE clauses, and they’d wonder why the EXPLAIN plan for a given SELECT would [...]
Replication of the NOW() function (also, time travel)
November 28, 2012 By 6 Comments
Notice the result of the NOW() function in the following query. The query was run on a real database server and I didn’t change the clock of the server or change anything in the database configuration settings.
1 2 3 4 5 6 7 | mysql> SELECT NOW(),SYSDATE(); +---------------------+---------------------+ | NOW() | SYSDATE() | +---------------------+---------------------+ | 1999-01-01 00:00:00 | 2012-11-29 05:50:03 | +---------------------+---------------------+ 1 row in set (0.00 sec) |
You may proceed to party like it is 1999. How can the NOW() function return a value [...]
Get Me Some Query Logs!
November 22, 2012 By 14 Comments
One of my favorite tools in the Percona Toolkit is pt-query-digest. This tool is indispensable for identifying your top SQL queries, and analyzing which queries are accounting for your database load. But the report you get from pt-query-digest is only as good as the log of queries you give it as input. You need a large [...]
Percona Live MySQL Conference and Expo 2013 – News from the Committee – Part 1
November 8, 2012 By Leave a Comment
I was honored to be asked to be a member of the committee for the “big” MySQL conference: Percona Live MySQL Conference and Expo 2013 in Santa Clara, CA. Personally, I’ve been attending this conference for 6 or 7 years and missing it only when my wife was pregnant with a due date in April [...]
