Really you need to look at what your server is doing, the traffic patterns, then you can tune. There is a lot you can determine by
just looking at the output of SHOW STATUS and SHOW VARIABLES.
Threads_created number high and growing? Increase the thread_cache_size
variable.
Opened_tables number keeps growing? Increase the table_cache variable
Those are very simple examples and there is a lot more you can tell, including how your indexes are doing. Read up on the status and
variables, there is information on ratios and lots of other good stuff to help you change basic things.
Careful with persistent connections and PHP, you can easily trip over your own
connections.
----- Original Message -----
From: "Gregory T Pelle" <[EMAIL PROTECTED]>
To: <mysql@lists.mysql.com>
Sent: Tuesday, September 12, 2006 12:50 PM
Subject: MySQL tuning advice
Hello,
I am looking for some advice regarding the tuning of a dedicated MySQL database
server.
The machine in questions is a Dell 2850 with dual Xeon procs and 4GB of memory running FreeBSD 6.1. Its sole purpose in life is
to run the MySQL 5.0.x database engine serving out databases to multiple Apache servers.
I started with the my-large.cnf file distributed with the MySQL port on FreeBSD
6.1. I made the following changes:
set max_allowed_packet = 2M
set-variable=max_connections=500
Now the questions:
1. What would be the recommended max_user_connections for the Dell 2850?
2. What is the practical maximum value that max_user_connections could be set
to?
I have been looking around for documentation regarding a max value for max_user
connections and found the following:
http://www-css.fnal.gov/dsg/external/freeware/mysqlTuning.html
What documentation do others use for tuning MySQL?
My goal is to convert our PHP and Perl applications we run on the Apache web servers to use persistent database connections to the
dedicated MySQL server.
--
Greg Pelle
System Administrator
Domain-it! Inc.
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