MySQL（Myisam）变量设置

Question

I have a single processor dedicated server with 4GB RAM and a 400MB Mysql database (Myisam) who has big performance problems. The database is used by an ecommerce. I already tryied to tune it using the mysqltuner script, but without good results. Because the variable settings have been modified several times, I would like to have a basic configuration to start from, thereafter try to tune it.

Answer 1

Try this tool, it always show good results for performance tuning.

https://tools.percona.com/wizard

Answer 2

For ecommerce, you need InnoDB. If you don't change, you will be burned badly when a crash occurs at just the wrong instant in a monetary transaction.

Make that change, then

key_buffer_size = 20M
innodb_buffer_pool_size = 1000M

read my blog on moving from MyISAM to InnoDB .

When you then find that things are not working fast enough, do

• long_query_time = 1
• turn on the slowlog
• wait a day
• run pt-query-digest to find the worst couple of queries
• present them to us for critique. The solution could be as simple as adding an composite index. Or maybe reformulating a SELECT.

I have redirected you toward slow queries because you cannot "tune" your way out of bad schema, bad queries, etc.