mysql存储过程太慢怎么办(2)-木庄网络博客

第二步：进入mysql命令行，输入

mysql> set profiling=1;
mysql> select func_getDevice(1);
mysql> show profiles;
+----------+------------+-----------------------+
| Query_ID | Duration   | Query                 |
+----------+------------+-----------------------+
|        1 | 0.00250400 | select * from TDevice |
+----------+------------+-----------------------+
1 row in set (0.00 sec)

这时候你就会看到一个详细的sql执行列表，但默认只记录15条sql，如果方法里面的sql比较多，那么可以通过设置

mysql> set profiling_history_size=20;
mysql> show variables like 'profiling%';
+------------------------+-------+
| Variable_name          | Value |
+------------------------+-------+
| profiling              | ON    |
| profiling_history_size | 15    |
+------------------------+-------+
2 rows in set (0.00 sec)
mysql> select func_getDevice(1);
mysql> show profiles;

这是时候就可以准确的看到是那一条sql语句影响了性能,比如 Query_ID=1 select * from TDevice 影响了性能;

mysql> show profile for query 1;详细查看执行一条sql的耗时情况
+--------------------------------+----------+
| Status                         | Duration |
+--------------------------------+----------+
| (initialization)               | 0.000003 | 
| checking query cache for query | 0.000042 | 
| Opening tables                 | 0.00001 | 
| System lock                    | 0.000004 | 
| Table lock                     | 0.000025 | 
| init                           | 0.000009 | 
| optimizing                     | 0.000003 |