通过show status 来优化MySQL数据库

 
2009年10月30日 星期五 22:53
1, 查看MySQL
服务器配置信息
mysql> show variables;
mysql> show variables;
2, 查看MySQL服务器运行的各种状态值
mysql> show global status;
mysql> show global status;
3, 慢查询
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
mysql> show variables like 'max_connections';  
+-----------------+-------+  
| Variable_name   | Value |  
+-----------------+-------+  
| max_connections | 500   |  
+-----------------+-------+  
mys