Mysql教程：性能跟踪语句
2008-08-30 11:07:25 来源：WEB开发网+------------------------------+-----------+-----------+------------+--------------+---------------+-------+
22 rows in set (0.00 sec)
mysql> select count(*) from t;
+----------+
| count(*) |
+----------+
| 4194304 |
+----------+
1 row in set (1.51 sec)
mysql> show profiles;
+----------+-------------+------------------------------------------------+
| Query_ID | Duration | Query |
+----------+-------------+------------------------------------------------+
| 1 | 0.02717000 | show tables |
| 2 | 0.74770100 | select count(*) from t |
| 3 | 0.00004200 | show prifile for query 2 |
| 4 | 34.30410100 | insert into t(username) select username from t |
| 5 | 1.50563800 | select count(*) from t |
+----------+-------------+------------------------------------------------+
5 rows in set (0.00 sec)
mysql> show profile cpu,block io,memory,swaps,context switches,source for query 5;
+--------------------------------+----------+----------+------------+-------------------+---------------------+--------------+---------------+-------+---------------------------+---------------+-------------+
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