通过showstatus来优化MySQL数据库..docx

通过show status 来优化MySQL数据库1, 查看MySQL服务器配置信息 Java代码 ?mysql?show?variables;??mysql show variables;2, 查看MySQL服务器运行的各种状态值 Java代码 ?mysql?show?global?status;??mysql show global status;3, 慢查询 Java代码 ?mysql?show?variables?like?%slow%; ??+------------------+-------+ ??|?Variable_name????|?Value?| ??+------------------+-------+ ??|?log_slow_queries?|?OFF???| ??|?slow_launch_time?|?2?????| ??+------------------+-------+ ??mysql?show?global?status?like?%slow%; ??+---------------------+-------+ ??|?Variable_name???????|?Value?| ??+---------------------+-------+ ??|?Slow_launch_threads?|?0?????| ??|?Slow_queries????????|?279???| ??+---------------------+-------+??mysql show variables like %slow%;+------------------+-------+| Variable_name | Value |+------------------+-------+| log_slow_queries | OFF || slow_launch_time | 2 |+------------------+-------+mysql show global status like %slow%;+---------------------+-------+| Variable_name | Value |+---------------------+-------+| Slow_launch_threads | 0 || Slow_queries | 279 |+---------------------+-------+配置中关闭了记录慢查询（最好是打开，方便优化），超过2秒即为慢查询，一共有279条慢查询 4, 连接数 Java代码 ?mysql?show?variables?like?max_connections; ??+-----------------+-------+ ??|?Variable_name???|?Value?| ??+-----------------+-------+ ??|?max_connections?|?500???| ??+-----------------+-------+ ????mysql?show?global?status?like?max_used_connections; ??+----------------------+-------+ ??|?Variable_name????????|?Value?| ??+----------------------+-------+ ??|?Max_used_connections?|?498???| ??+----------------------+-------+??mysql show variables like max_connections;+-----------------+-------+| Variable_name | Value |+-----------------+-------+| max_connections | 500 |+-----------------+-------+mysql show global status like max_used_connections;+----------------------+-------+| Variable_name | Value |+----------------------+-------+| Max_used_connections | 498 |+----------------------+-------+设置的最大连接数是500，而响应的连接数是498 max_used_connections