MySQL存储过程的调优过程

1. mysql> SELECT whatstheweatherlike(5);
2. +----------------------------------------------------------+
3. | whatstheweatherlike(5)                                   |
4. +----------------------------------------------------------+
5. | Its 5°C, time IS 02:28:05, feels [LIKE] almost summer!   |
6. +  ----------------------------------------------------------+
8.  row IN SET (0.00 sec)
9.  
10. host # tail /var/log/mysql/mysql-slow.log

可见只显示了对stored-routine的时间记录，并没有对内部的语句的详细运行状况的提示。
这种情况下，可以使用profile进行调优。

过程如下：

1. mysql> SET profiling=1;
2. Query OK, 0 rows affected (0.00 sec)
3.  
4. mysql> SELECT whatstheweatherlike(3);
5. +-----------------------------------------------------------+
6. | whatstheweatherlike(3)                                    |
7. +-----------------------------------------------------------+
8. | Its 3°C, time IS 02:43:25, feels [LIKE] snow IS melting   |
9. +   -----------------------------------------------------------+
11.  row IN SET (0.00 sec)
12.  
13. mysql> SHOW profiles;
14. +----------+------------+-------------------------------------------------------------+
16.  Query_ID | Duration   | Query                                                       |
17. +----------+------------+-------------------------------------------------------------+
19.         1 | 0.00005100 | SELECT CURTIME() INTO time                                  |
20. |        2 | 0.00014100 | SELECT feeling INTO feels FROM weather WHERE temp = in_temp |
21. +----------+------------+-------------------------------------------------------------+
23. rows IN SET (0.00 sec)

这样就能看到存储过程内部语句的执行情况了。