September 19, 2014

Getting MySQL to use full key length

There is one bug, or “missing feature” in MySQL Optimizer which may give you hard time causing performance problems which may be hard to track down, it is using only part of the index when full index can be used or using shorter index while there is longer index available. The last item is yet […]

Linux IO Schedulers and MySQL

Found a great article about Linux IO Schedulers today which is quite interesting. It goes in details about schedulers and explains in which of workloads which of schedulers is best. The interesting thing this article points out is – there are multiple versions of each of the schedulers, while name remains the same. This means […]

Making MySQL Replication Parallel

Kevin Burton writes about making MySQL Replication Parallel. Many of us have been beaten by the fact MySQL Replication is single threaded so in reality it is only able to use only single CPU and single disk effectively which is getting worse and worse as computers are getting “wider” these days with multi-core CPUs. Kevin […]

TMP_TABLE_SIZE and MAX_HEAP_TABLE_SIZE

We all know disk based temporary tables are bad and you should try to have implicit temporary tables created in memory where possible, do to it you should increase tmp_table_size to appropriate value and avoid using blob/text columns which force table creation on the disk because MEMORY storage engine does not support them Right ? […]

MySQL Binaries availability

It looks like it looks like there are going a lot of discussions about future of MySQL Community Binaries, see for example this post and Kaj’s clarifications. Obviously now it grew to a lot of speculations and many comments are far from real story. It is also really interesting to watch MySQL try to balance […]

INSERT ON DUPLICATE KEY UPDATE and REPLACE INTO

Jonathan Haddad writes about REPLACE INTO and INSERT ON DUPLICATE KEY UPDATE. Really, Why MySQL has both of these, especially both are non ANSI SQL extensions ? The story here seems to be the following – REPLACE INTO existed forever, at least since MySQL 3.22 and was a way to do replace faster and what […]

Performance impact of complex queries

What is often underestimated is impact of MySQL Performance by complex queries on large data sets(ie some large aggregate queries) and batch jobs. It is not rare to see queries which were taking milliseconds to stall for few seconds, especially in certain OS configurations, and on low profile servers (ie having only one disk drive) […]

Speaking at MySQL Users Conference 2007

Just got email from Jay today about two of my talks being accepted to MySQL Users Conference 2007 “MySQL Server Settings Tuning” and “MySQL Performance Cookbook”. This is great as MySQL Conferences are always fun and great way to get to know people and learn things about MySQL and connected areas. This will be my […]

Some of our articles are translated to Russian

A friend pointed out to me number of our our articles were translated and included in PHPInside.RU – electronic magazine about PHP and surrounding technologies which of course include MySQL. You can download PDF for free right here. We love our articles being translated and or republished, as long as they are available for free […]

Binaries of MySQL 5.0.33 Community release for AMD64 / EM64T

Update 3 June 2008: We have removed the builds below, since they are quite obsolete and no one has posted comments about them since more than a year ago. Great news are MySQL finally released new Community release – MySQL 5.0.33, which however as promised comes without Binaries. This version also does not have any […]