mysql> show status like 'connections';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Connections | 6 |
+---------------+-------+
1 row in set (0.00 sec)
查询服务器启动了多长时间：
mysql> show status like 'Uptime';
+---------------+---------+
| Variable_name | Value |
+---------------+---------+
| Uptime | 1119745 |
+---------------+---------+
1 row in set (0.00 sec)
//慢查询的次数
mysql> show status like 'Slow_queries%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Slow_queries | 0 |
+---------------+-------+
1 row in set (0.01 sec)
//索引使用次数——没有建索引
mysql> show status like 'hander_read%';
Empty set (0.00 sec)