MySQL中如何查詢當前正在運行的SQL語句

通過status命令，查看Slow queries這一項，如果值長時間>0,說明有查詢執行時間過長

mysql> status; 
-------------- 
mysql Ver 11.18 Distrib 3.23.58, for redhat-linux-gnu (i386) 
Connection id: 53 
Current database: (null) 
Current user: root@localhost 
Current pager: stdout 
Using outfile: '' 
Server version: 5.0.37-log 
Protocol version: 10 
Connection: Localhost via UNIX socket 
Client characterset: latin1 
Server characterset: latin1 
UNIX socket: /tmp/mysql.sock 
Uptime: 4 days 16 hours 49 min 57 sec 
Threads: 1 Questions: 706 Slow queries: 0 Opens: 177 Flush tables: 1 Open tables:
52 Queries per second avg: 0.002 

　　這時再通過show processlist命令來查看當前正在運行的SQL，從中找出運行慢的SQL語句，找到執行慢的語句后，再用explain命令查看這些語句的執行計划。

mysql> show processlist;
+----+------+-----------+------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+-----------+------+---------+------+-------+------------------+
| 53 | root | localhost | NULL | Query | 0 | NULL | show processlist |
+----+------+-----------+------+---------+------+-------+------------------+