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