Buy Percona ServicesBuy Now!

Join performance of MyISAM and Innodb

 | May 29, 2006 |  Posted In: Benchmarks

We had discussion today which involved benchmarks of Join speed for MyISAM and Innodb storage engines for CPU bound workload, this is when data size is small enough to fit in memory and so buffer pool. I tested very simple table, having with about 20.000 rows in it on 32bit Linux. The columns “id” “i” […]

Read More

Jeremy Cole on MySQL Replication

 | May 27, 2006 |  Posted In: Insight for DBAs

Jeremy Cole recently posted very nice post about MySQL Replication Performance. There are however few points I should comment on. Jeremy Speaks about MyISAM and Innodb in the same terms, in fact they are quite different for Replication. As you probably know MyISAM uses buffered IO so if master crashes you’re out of sync anyway […]

Read More

MyISAM mmap feature (5.1)

 | May 26, 2006 |  Posted In: Insight for DBAs

As you know MyISAM does not cache data, only indexes. MyISAM assumes OS cache is good enough and uses pread/pwrite system calls for reading/writing datafiles. However OS is not always good in this task, my benchmarks show Linux/Solaris aren’t scalable on intensive pread calls (I believe the same for Windows, but I did not test […]

Read More

To pack or not to pack – MyISAM Key compression

 | May 13, 2006 |  Posted In: Insight for DBAs

MyISAM storage engine has key compression which makes its indexes much smaller, allowing better fit in caches and so improving performance dramatically. Actually packed indexes not a bit longer rows is frequent reason of MyISAM performing better than Innodb. In this article I’ll get in a bit more details about packed keys and performance implications […]

Read More