Linode提供了一个用于低内存服务器的MySQL内存占用优化建议，可以用来参考。

配置文件: /etc/my.cnf


[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1
# Low memory optimizations
skip-bdb
skip-innodb
skip-networking
server-id = 1
key_buffer = 256K
max_allowed_packet=1M
thread_stack = 64K
table_cache = 4
sort_buffer_size = 64K
read_buffer_size = 256K
read_rnd_buffer_size = 256K
net_buffer_length = 2K
thread_stack = 64K
query_cache_limit=256K
query_cache_size = 2M
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/my