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HomeDatabaseMysql TutorialMYSQL教程:my.cnf缓存优化_MySQL

1、看机器配置,指三大件:cpu、内存、硬盘
2、看mysql配置参数
3、查系mysql行状态,可以用mysqlreport工具来查看
4、查看mysql的慢查询
依次解决了以上问题之后,再来查找程序方面的问题


my.cnf缓存优化
在 my.cnf 中添加/修改以下选项:

#取消文件系统的外部锁
 skip-locking

 #不进行域名反解析,注意由此带来的权限/授权问题
 skip-name-resolve

 #索引缓存,根据内存大小而定,如果是独立的db服务器,可以设置高达80%的内存总量
 key_buffer = 512M

 #连接排队列表总数
 back_log = 200
 max_allowed_packet = 2M

 #打开表缓存总数,可以避免频繁的打开数据表产生的开销
 table_cache = 512

 #每个线程排序所需的缓冲
 sort_buffer_size = 4M

 #每个线程读取索引所需的缓冲
 read_buffer_size = 4M

 #MyISAM表发生变化时重新排序所需的缓冲
 myisam_sort_buffer_size = 64M

 #缓存可重用的线程数
 thread_cache = 128

 #查询结果缓存
 query_cache_size = 128M

 #设置超时时间,能避免长连接
 set-variable = wait_timeout=60

 #最大并发线程数,cpu数量*2
 thread_concurrency = 4

 #记录慢查询,然后对慢查询一一优化
 log-slow-queries = slow.log
 long_query_time = 1

 #关闭不需要的表类型,如果你需要,就不要加上这个
 skip-innodb
 skip-bdb

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