Mysql: increase the size of innodb_buffer_pool_size

By putting this on your mysql config file:

innodb_buffer_pool_size = 2G

In dedicated db machines, you can set this to close to 80% of the available memory. This will avoid disk writes and speed up things in general.

The mysql configuration file is on :

/etc/my.cnf (usually)

Restaring mysql, and barabum barabim

The typical error message you get when this is too small is:

Mysql::Error: The total number of locks exceeds the lock table size: