May 22, 2013

How to use a smartphone for two-factor authentication with Percona Server for MySQL

February 24, 2013 By Leave a Comment

In this post I will describe a non-trivial way to authenticate users in Percona Sever for MySQL. Percona Server comes with PAM authentication plugin, which allows you to do a lot of cool things, such as: OS authentication, LDAP authentication, even RSA Secure Server authentication (which is useful if you are required a PCI-compliance), and [...]

Filed Under: MySQL, Percona Software

How to create/restore a slave using GTID replication in MySQL 5.6

February 8, 2013 By 7 Comments

MySQL 5.6 is GA! Now we have new things to play with and in my personal opinion the most interesting one is the new Global Transaction ID (GTID) support in replication. This post is not an explanation of what is GTID and how it works internally because there are many documents about that: http://dev.mysql.com/doc/refman/5.6/en/replication-gtids-concepts.html One [...]

Filed Under: MySQL

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: , ,

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 [...]

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

Debugging MySQL SSL problems

November 8, 2012 By Leave a Comment

This is not necessarily going to be a comprehensive post, but I learned somethings about MySQL SSL today that I thought would be worth sharing. I was setting up a PRM install for a customer and one of the requirements was SSL replication.  In this particular case, I had setup PRM first, and then was [...]

Filed Under: MySQL

Minimizing Downtime from Lengthy AWS Outages

October 24, 2012 By 6 Comments

Well, it happened again…  Another lengthy EBS outage in the US-East region impacted several sites across the net.  While failures like this are rare, they can be quite costly and translate into headaches for the operations team when impact production systems for any length of time.  At Percona, we routinely help clients architect and deploy [...]

Filed Under: Cloud and NoSQL, MySQL

DROP TABLE and stalls: Lazy Drop Table in Percona Server and the new fixes in MySQL

June 22, 2012 By 33 Comments

Suppose you have turned on innodb_file_per_table (which means that each table has its own tablespace), and you have to drop tables in a background every hour or every day. If its once every day then you can probably schedule the table dropping process to run during off-peak hours. But I have seen cases where the [...]

Filed Under: Benchmarks, Insight for DBAs, MySQL

Benchmarking single-row insert performance on Amazon EC2

May 16, 2012 By 17 Comments

I have been working for a customer benchmarking insert performance on Amazon EC2, and I have some interesting results that I wanted to share. I used a nice and effective tool iiBench which has been developed by Tokutek. Though the “1 billion row insert challenge” for which this tool was originally built is long over, [...]

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

Joining many tables in MySQL – optimizer_search_depth

April 20, 2012 By 8 Comments

Working on customer case today I ran into interesting problem – query joining about 20 tables (thank you ORM by joining all tables connected with foreign keys just in case) which would take 5 seconds even though in the read less than 1000 rows and doing it completely in memory. The plan optimizer picked was [...]

Filed Under: Insight for DBAs, MySQL

Percona Live MySQL Conference & Expo Was A Great Event

April 17, 2012 By 2 Comments

Thanks to all of our sponsors, speakers, speaker selection committee, event staff, and especially the attendees for making last week’s conference a resounding success. With over a thousand people, the event made a good comeback after last year’s event, but more importantly, the mood was strongly optimistic. I think a lot of people arrived with [...]

Filed Under: Events and Announcements, MySQL
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