Mysql性能跟踪器 profiling 分析工具使用
profiling功能是对mysql当前连接进行设置的，退出后恢复就木有了
开启：SET profiling=1;
关闭：SET profiling=0;
其他
SHOW profiles;
show profile for query 2;
show profile block io,cpu for query 2;
具体使用
------------
要注意两点。
1、不过版本要在5.0.37之后手册上介绍：(SHOW PROFILES and SHOW PROFILE were added in MySQL 5.0.37. )
Important
Please note that the SHOW PROFILE and SHOW PROFILES functionality is part of the MySQL 5.0 Community Server only.
2、变量profiling是用户变量，每次都得重新启用。
以下是我做的一些实验。数据很明显，就不多解释了。
先进入某个库中然后运行：show profiling;如下：
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 |
+----------------+
4 rows in set (0.03 sec)
mysql> select count(*) from t;
+----------+
| count(*) |
+----------+
| 2097152 |
+----------+
1 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 |
+----------+------------+------------------------+
2 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 |
+--------------------------------+----------+
17 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 |
+--------------------------------+----------+----------+------------+--------------+---------------+
17 rows in set (0.00 sec)
mysql> insert into t(username) select username from t;
Query OK, 2097152 rows affected (34.17 sec)
Records: 2097152Duplicates: 0Warnings: 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 |
+----------+-------------+------------------------------------------------+
4 rows in set (0.00 sec)
mysql> show profile cpu,block io,memory,swaps for query 4;
+------------------------------+-----------+-----------+------------+--------------+---------------+-------+
| Status | Duration| CPU_user| CPU_system | Block_ops_in | Block_ops_out | Swaps |
+------------------------------+-----------+-----------+------------+--------------+---------------+-------+
| (initialization) | 0.000038| 0 | 0|0 | 0 | 0 |
| checking permissions | 0.000016| 0 | 0|0 | 0 | 0 |
| Opening tables | 0.000014| 0 | 0|0 | 0 | 0 |
| System lock| 0.000007| 0 | 0|0 | 0 | 0 |
| Table lock | 0.000013| 0 | 0|0 | 0 | 0 |
| init | 0.000015| 0 | 0|0 | 0 | 0 |
| optimizing | 0.000006| 0 | 0|0 | 0 | 0 |
| statistics | 0.000012| 0 | 0|0 | 0 | 0 |
| preparing| 0.000011| 0 | 0|0 | 0 | 0 |
| Creating tmp table | 0.000029| 0 | 0|0 | 0 | 0 |
| executing| 0.000005| 0 | 0|0 | 0 | 0 |
| Copying to tmp table | 1.262877| 1.24981 | 0.012998 |0 | 0 | 0 |
| converting HEAP to MyISAM| 0.384814| 0.187971| 0.19797|0 | 0 | 0 |
| Copying to tmp table on disk | 1.417069| 1.203817| 0.191971 |0 | 0 | 0 |
| Sending data | 31.104185 | 13.965877 | 0.843872 |0 | 0 | 0 |
| end| 0.000017| 0 | 0|0 | 0 | 0 |
| removing tmp table | 0.134872| 0 | 0.029995 |0 | 0 | 0 |
| end| 0.000026| 0 | 0|0 | 0 | 0 |
| query end| 0.000006| 0 | 0|0 | 0 | 0 |
| freeing items| 0.000011| 0 | 0|0 | 0 | 0 |
| closing tables | 0.000009| 0 | 0|0 | 0 | 0 |
| logging slow query | 0.000049| 0 | 0|0 | 0 | 0 |
+------------------------------+-----------+-----------+------------+--------------+---------------+-------+
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;
+--------------------------------+----------+----------+------------+-------------------+---------------------+--------------+---------------+-------+---------------------------+---------------+-------------+
| Status | Duration | CPU_user | CPU_system | Context_voluntary | Context_involuntary | Block_ops_in | Block_ops_out | Swaps | Source_function | Source_file | Source_line |
+--------------------------------+----------+----------+------------+-------------------+---------------------+--------------+---------------+-------+---------------------------+---------------+-------------+
| (initialization) | 0.000004 | 0| 0| 0 | 0 |0 | 0 | 0 | send_result_to_client | sql_cache.cc|1099 |
| checking query cache for query | 0.000048 | 0| 0| 0 | 0 |0 | 0 | 0 | open_tables | sql_base.cc |2629 |
| Opening tables | 0.000011 | 0| 0| 0 | 0 |0 | 0 | 0 | mysql_lock_tables | lock.cc | 153 |
| System lock| 0.000007 | 0| 0| 0 | 0 |0 | 0 | 0 | mysql_lock_tables | lock.cc | 162 |
| Table lock | 0.000032 | 0| 0| 0 | 0 |0 | 0 | 0 | mysql_select| sql_select.cc |2242 |
| init | 0.000013 | 0| 0| 0 | 0 |0 | 0 | 0 | optimize| sql_select.cc | 745 |
| optimizing | 0.000008 | 0| 0| 0 | 0 |0 | 0 | 0 | optimize| sql_select.cc | 904 |
| statistics | 0.000013 | 0| 0| 0 | 0 |0 | 0 | 0 | optimize| sql_select.cc | 914 |
| preparing| 0.000011 | 0| 0| 0 | 0 |0 | 0 | 0 | exec| sql_select.cc |1565 |
| executing| 0.000006 | 0| 0| 0 | 0 |0 | 0 | 0 | exec| sql_select.cc |2083 |
| Sending data | 1.505401 | 1.504771 | 0| 3 | 5 |0 | 0 | 0 | mysql_select| sql_select.cc |2287 |
| end| 0.000015 | 0| 0| 0 | 0 |0 | 0 | 0 | mysql_execute_command | sql_parse.cc|5122 |
| query end| 0.000005 | 0| 0| 0 | 0 |0 | 0 | 0 | query_cache_end_of_result | sql_cache.cc| 729 |
| storing result in query cache| 0.000007 | 0| 0| 0 | 0 |0 | 0 | 0 | mysql_parse | sql_parse.cc|6116 |
| freeing items| 0.00001| 0| 0| 0 | 0 |0 | 0 | 0 | dispatch_command| sql_parse.cc|2146 |
| closing tables | 0.000009 | 0| 0| 0 | 0 |0 | 0 | 0 | log_slow_statement| sql_parse.cc|2204 |
| logging slow query | 0.000038 | 0| 0| 0 | 0 |0 | 0 | 0 | dispatch_command| sql_parse.cc|2169 |
+--------------------------------+----------+----------+------------+-------------------+---------------------+--------------+---------------+-------+---------------------------+---------------+-------------+
17 rows in set (0.00 sec)
mysql> update t set username = 'waill';
Query OK, 4194304 rows affected (44.82 sec)
Rows matched: 4194304Changed: 4194304Warnings: 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'|
+----------+-------------+------------------------------------------------+
6 rows in set (0.00 sec)
mysql> show profile cpu,block io,memory,swaps,context switches,source for query 6;
+----------------------+-----------+-----------+------------+-------------------+---------------------+--------------+---------------+-------+-----------------------+---------------+-------------+
| Status | Duration| CPU_user| CPU_system | Context_voluntary | Context_involuntary | Block_ops_in | Block_ops_out | Swaps | Source_function | Source_file | Source_line |
+----------------------+-----------+-----------+------------+-------------------+---------------------+--------------+---------------+-------+-----------------------+---------------+-------------+
| (initialization) | 0.000035| 0 | 0| 0 | 0 |0 | 0 | 0 | check_access| sql_parse.cc|5306 |
| checking permissions | 0.000011| 0 | 0| 0 | 0 |0 | 0 | 0 | open_tables | sql_base.cc |2629 |
| Opening tables | 0.000011| 0 | 0| 0 | 0 |0 | 0 | 0 | mysql_lock_tables | lock.cc | 153 |
| System lock| 0.000007| 0 | 0| 0 | 0 |0 | 0 | 0 | mysql_lock_tables | lock.cc | 162 |
| Table lock | 0.000008| 0 | 0| 0 | 0 |0 | 0 | 0 | mysql_update| sql_update.cc | 167 |
| init | 0.000021| 0 | 0| 0 | 0 |0 | 0 | 0 | mysql_update| sql_update.cc | 429 |
| Updating | 44.514679 | 27.976747 | 2.818571 |9949 |1584 |0 | 0 | 0 | mysql_update| sql_update.cc | 560 |
| end| 0.305671| 0.028996| 0.023997 |43 |18 |0 | 0 | 0 | mysql_execute_command | sql_parse.cc|5122 |
| query end| 0.000026| 0 | 0| 0 | 0 |0 | 0 | 0 | mysql_parse | sql_parse.cc|6116 |
| freeing items| 0.000016| 0 | 0| 0 | 0 |0 | 0 | 0 | dispatch_command| sql_parse.cc|2146 |
| closing tables | 0.000012| 0 | 0| 0 | 0 |0 | 0 | 0 | log_slow_statement| sql_parse.cc|2204 |
| logging slow query | 0.00005 | 0 | 0| 0 | 0 |0 | 0 | 0 | dispatch_command| sql_parse.cc|2169 |
+----------------------+-----------+-----------+------------+-------------------+---------------------+--------------+---------------+-------+-----------------------+---------------+-------------+
12 rows in set (0.00 sec)
转：http://www.justwinit.cn/post/1275/