People are sometimes contacting me and asking about bugs like this which provide a trivial way to crash MySQL to the user with basic privileges and asking me what to do. My answer to them is – there is nothing new to it and they just sit should back and relax Really – there are [...]
Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
I now got answers to the second portions of the questions you asked Heikki. If you have not seen the first part it can be found here. Same as during last time I will provide my comments for some of the answers under PZ and will use HT for original Heikkis answer. Q26: You also [...]
Progress with ClickAider project
October 24, 2007 By 21 Comments
About three months ago I announced ClickAider to become available to general public. And I think it is about the time to write about the progress we have with this project for those who interested. The project generates decent interest and we have about 3000 sites Registered over this time, which I consider decent number [...]
Commodity Hardware, Commodity Software and Commodity People
June 15, 2007 By 9 Comments
In the previous post I mentioned not all architectures and solutions work for Commodity People, and people seems to agree with me. Number of vendors would claim they are in Commodity Software or Hardware business but few would probably mention they are doing it for Commodity People, because few people would like to be called [...]
MySQL 4 to MySQL 5 Upgrade performance regressions
June 6, 2007 By 8 Comments
This week I already had two serious performance regression cases when upgrading from MySQL 4.0 and 4.1 to MySQL 5.0. By serious I mean several times performance difference not just 5-10% you often see for simple queries due to generally fatter code. The problem in both cases was MySQL 5.0 broken group commit bug. First [...]
MySQL Replication and Slow Queries
March 28, 2007 By 3 Comments
I just filed a bug regarding slow queries executed by replication thread are not being logged to the slow query log. This is not a big deal but it is ugly little gotcha which I think few people know about. It is especially bad if you’re using tools to analyze slow query log to find [...]
Why do you need many apache children ?
February 5, 2007 By 15 Comments
I already wrote kind of about same topic a while ago and now interesting real life case makes me to write again Most Web applications we’re working with have single tier web architecture, meaning there is just single set of apache servers server requests and nothing else – no dedicated server for static content, no [...]
InnoDB benchmarks
January 3, 2007 By 15 Comments
There was several changes in InnoDB to fix scalabilty problems, so I ran benchmark to check new results and also compare overall performance of InnoDB in 5.0 and 5.1 before and after fixes. Problems in InnoDB that were fixed: Thread trashing issues with count of theads 100+. In this case performance of InnoDB degraded dramatically. [...]
Backport of micro-time patch to mysql 4.1
October 1, 2006 By 9 Comments
Taking into account 4.1 tree is still popular and is used on many production servers we decided to make backport of patch to slow-log queries. The patch allows to specify time of slow queries in microseconds and is very helpful in a fight with problematic queries. 4.1 Patch is available here (The original patch was [...]
Watch out for Marketing benchmarks
August 23, 2006 By 7 Comments
Whenever I see benchmark results I try to understand if it is technical benchmark – made by people seeking the truth or it is done by Marketing department to wash your brains. Watch out. Whenever you treat marketing benchmarks as technical ones, you make make wrong decision. Take a look at MySQL 5.0 Benchmarks Whitepaper [...]
