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mysql profile 调试sql_MySQL使用profile分析SQL执行状态

mysql使用profile分析sql执行状态 说明

mysql> use test

Database changed

mysql> set profiling=1;

Query OK, 0 rows affected (0.00 sec)

mysql> show tables;

+----------------+

| Tables_in_test |

+----------------+

| bag_item |

| bag_user |

| score |

| t |

+----------------+

rows in set (0.03 sec)

mysql> select count(*) from t;

+----------+

| count(*) |

+----------+

| 2097152 |

+----------+

row in set (0.74 sec)

mysql> show profiles;

+----------+------------+------------------------+

| Query_ID | Duration | Query |

+----------+------------+------------------------+

| 1 | 0.02717000 | show tables |

| 2 | 0.74770100 | select count(*) from t |

+----------+------------+------------------------+

rows in set (0.00 sec)

mysql> show profile for query 2;

+--------------------------------+----------+

| Status | Duration |

+--------------------------------+----------+

| (initialization) | 0.000004 |

| checking query cache for query | 0.000044 |

| Opening tables | 0.000012 |

| System lock | 0.000017 |

| Table lock | 0.00003 |

| init | 0.000013 |

| optimizing | 0.000008 |

| statistics | 0.000013 |

| preparing | 0.000011 |

| executing | 0.000006 |

| Sending data | 0.747313 |

| end | 0.000014 |

| query end | 0.000006 |

| storing result in query cache | 0.000006 |

| freeing items | 0.000012 |

| closing tables | 0.000009 |

| logging slow query | 0.000183 |

+--------------------------------+----------+

rows in set (0.00 sec)

mysql> show profile block io,cpu for query 2;

+--------------------------------+----------+----------+------------+--------------+---------------+

| Status | Duration | CPU_user | CPU_system | Block_ops_in | Block_ops_out |

+--------------------------------+----------+----------+------------+--------------+---------------+

| (initialization) | 0.000004 | 0 | 0 | 0 | 0 |

| checking query cache for query | 0.000044 | 0 | 0 | 0 | 0 |

| Opening tables | 0.000012 | 0 | 0 | 0 | 0 |

| System lock | 0.000017 | 0 | 0 | 0 | 0 |

| Table lock | 0.00003 | 0 | 0 | 0 | 0 |

| init | 0.000013 | 0 | 0 | 0 | 0 |

| optimizing | 0.000008 | 0 | 0 | 0 | 0 |

| statistics | 0.000013 | 0 | 0 | 0 | 0 |

| preparing | 0.000011 | 0 | 0 | 0 | 0 |

| executing | 0.000006 | 0 | 0 | 0 | 0 |

| Sending data | 0.747313 | 0.746887 | 0 | 0 | 0 |

| end | 0.000014 | 0 | 0 | 0 | 0 |

| query end | 0.000006 | 0 | 0 | 0 | 0 |

| storing result in query cache | 0.000006 | 0 | 0 | 0 | 0 |

| freeing items | 0.000012 | 0 | 0 | 0 | 0 |

| closing tables | 0.000009 | 0 | 0 | 0 | 0 |

| logging slow query | 0.000183 | 0 | 0 | 0 | 0 |

+--------------------------------+----------+----------+------------+--------------+---------------+

rows in set (0.00 sec)

mysql> insert into t(username) select username from t;

Query OK, 2097152 rows affected (34.17 sec)

Records: 2097152 Duplicates: 0 Warnings: 0

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 |

+----------+-------------+------------------------------------------------+

rows in set (0.00 sec)

mysql> show profile cpu,block io,memory,swaps for query 4;

mysql> select count(*) from t;

+----------+

| count(*) |

+----------+

| 4194304 |

+----------+

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 |

+----------+-------------+------------------------------------------------+

rows in set (0.00 sec)

mysql> show profile cpu,block io,memory,swaps,context switches,source for query 5;

……

mysql> update t set username = 'waill';

Query OK, 4194304 rows affected (44.82 sec)

Rows matched: 4194304 Changed: 4194304 Warnings: 0

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 |

| 6 | 44.82054700 | update t set username = 'waill' |

+----------+-------------+------------------------------------------------+

rows in set (0.00 sec)

mysql> show profile cpu,block io,memory,swaps,context switches,source for query 6;

转载:http://hi.baidu.com/chssheng2007/blog/item/a97888b3e8ac0ebfd9335aae.html

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