2010/1/25 John G. Heim <jheim@stripped>:
> I have a server with 16Gb of RAM and a dual-core 2Ghz processor. It is
> running the latest mysql-server from debian lenny (5.0.1). I have databases
> for drupal, moodle, spamassassin, horde3, and a small database for
> departmental stuff.
>
> The problem is that inserts/updates are sometimes very slow, on the order of
> a minute. I am hoping somebody can sspot something wrong in my config.
> Here's the optimization settings section (for your convenience). The whole
> my.cnf is reproduced below that:
Are your databases using MyISAM or InnoDB?
* If MyISAM, you could be suffering contention problems on writes
because of full table locks. No easy solution but engine change or
database sharding. Also key_buffer, (and the other buffers) coud be
too small for 16GB of RAM. Are you really using more thant 10% of it?
You could also disable other engines if unused.
* If InnoDB, you have not set innodb_buffer_pool_size nor log size.
You could increase the pool to >50% of ram available.
Those are very general suggestions. It depends a lot on your hardware
(slow storage?), other apps installed on the same machine or the load
of the server, among others.
There also exists a tool to get introduced into MySQL server variables
tuning: Tuning primer - https://launchpad.net/mysql-tuning-primer It
is also a very general tool, but it could be helpful for a starting
point.
Regards,
--
Jaime Crespo
MySQL & Java Instructor
Warp Networks
<http://warp.es>
