简单解决mysql占用资源过大问题

在 linux 下，经常出现的情况就是使用 VBB 这种论坛系统时，出现缓慢，mysql 假死状态，sleep进程过多等等现像。导致几十个用户，就把系统搞定了。

其实这是 mysql 配置上的问题， 默认的 linux 中， mysql 的配置是 my-large.cnf 配置，该配置适合大型服务器。有高内存，比如2G，4G内存的，适合使用，而一般512M内存 的就不行了。它会占用512M内存来保存系统 mysql 的进程，这些进程长期堆质，并不释放，导致系统缓慢。所以，把配置改变成为 my-small.cnf ，小型配置就可以了。它的配置如下：

# Example mysql config file for small systems.

#

# This is for a system with little memory (<= 64M) where MySQL is only used

# from time to time and it's important that the mysqld deamon

# doesn't use much resources.

#

# You can copy this file to

# /etc/my.cnf to set global options,

# mysql-data-dir/my.cnf to set server-specific options (in this

# installation this directory is /var/lib/mysql) or

# ~/.my.cnf to set user-specific options.

#

# One can in this file use all long options that the program supports.

# If you want to know which options a program support, run the program

# with --help option.

# The following options will be passed to all MySQL clients

[client]

#password = 你的密码

port = 3306

socket = /tmp/mysql.sock

# Here follows entries for some specific programs

# The MySQL server

[mysqld]

port = 3306

socket = /tmp/mysql.sock

skip-locking

set-variable = key_buffer=16K

set-variable = max_allowed_packet=1M

set-variable = thread_stack=64K

set-variable = table_cache=4

set-variable = sort_buffer=64K

set-variable = net_buffer_length=2K

server-id = 1

# Uncomment the following if you want to log updates

#log-bin

# Uncomment the following if you are NOT using BDB tables

#skip-bdb

# Uncomment the following if you are using InnoDB tables

#innodb_data_home_dir = /var/lib/mysql/

#innodb_data_file_path = ibdata1:10M:autoextend

#innodb_log_group_home_dir = /var/lib/mysql/

#innodb_log_arch_dir = /var/lib/mysql/

# You can set .._buffer_pool_size up to 50 - 80 %

# of RAM but beware of setting memory usage too high

#set-variable = innodb_buffer_pool_size=16M

#set-variable = innodb_additional_mem_pool_size=2M

# Set .._log_file_size to 25 % of buffer pool size

#set-variable = innodb_log_file_size=5M

#set-variable = innodb_log_buffer_size=8M

#innodb_flush_log_at_trx_commit=1

#set-variable = innodb_lock_wait_timeout=50

[mysqldump]

quick

set-variable = max_allowed_packet=16M

[mysql]

no-auto-rehash

# Remove the next comment character if you are not familiar with SQL

#safe-updates

[isamchk]

set-variable = key_buffer=8M

set-variable = sort_buffer=8M

[myisamchk]

set-variable = key_buffer=8M

set-variable = sort_buffer=8M

[mysqlhotcopy]

interactive-timeout

以上配置足够 你的系统高速运行 mysql 了，sleep的进程，很快就被回收，不占资源，这非常适合小型服务器。一般个人托管的服务器也很适合。