本篇内容主要讲解“怎么使用MySQL profile”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么使用MySQL profile”吧!
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剖析单条查询 profile:
mysql> show variables like '%prof%';
+------------------------+-------+
| Variable_name | Value |
+------------------------+-------+
| have_profiling | YES |
| profiling | OFF |
| profiling_history_size | 15 |
+------------------------+-------+
3 rows in set (0.00 sec)
mysql> set profiling = 1;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> show variables like '%prof%';
+------------------------+-------+
| Variable_name | Value |
+------------------------+-------+
| have_profiling | YES |
| profiling | ON |
| profiling_history_size | 15 |
+------------------------+-------+
3 rows in set (0.00 sec)
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select count(*) from user;
+----------+
| count(*) |
+----------+
| 4 |
+----------+
1 row in set (0.03 sec)
mysql> show profiles;
+----------+------------+------------------------------+
| Query_ID | Duration | Query |
+----------+------------+------------------------------+
| 1 | 0.00103425 | show variables like '%prof%' |
| 2 | 0.00016325 | SELECT DATABASE() |
| 3 | 0.00049450 | show databases |
| 4 | 0.00039775 | show tables |
| 5 | 0.02702100 | select count(*) from user |
+----------+------------+------------------------------+
5 rows in set, 1 warning (0.00 sec)
mysql> show profile for query 5;
+----------------------+----------+
| Status | Duration |
+----------------------+----------+
| starting | 0.000090 |
| checking permissions | 0.000012 |
| Opening tables | 0.000030 |
| init | 0.000035 |
| System lock | 0.000016 |
| optimizing | 0.025417 |
| executing | 0.000054 |
| end | 0.000551 |
| query end | 0.000020 |
| closing tables | 0.000021 |
| freeing items | 0.000732 |
| cleaning up | 0.000045 |
+----------------------+----------+
12 rows in set, 1 warning (0.00 sec)
到此，相信大家对“怎么使用MySQL profile”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
