MySQL Query Profile_mssql学习_编程技术-你的首页-uuhomepage.comMySQL Query Profile MySQL 5.0.37 以上开始支持 MySQL Query Profiler, 可以查询到此 SQL 会执行多少时间, 并看出 CPU/Memory 使用量, 执行过程中 System lock, Table lock 花多少时间等等. 详细可以参见官方文档：Using the New MySQL Query Profiler 启动 mysql> set profiling=1;Query OK, 0 rows affected (0.00 sec)测试查询 mysql> select count(*) from client where broker_id=2;+----------+| count(*) |+----------+| 200 |+----------+1 row in set (0.00 sec)查看profiles mysql> show profiles;+----------+------------+-----------------------------------------------+| Query_ID | Duration | Query |+----------+------------+-----------------------------------------------+| 0 | 0.00007300 | set profiling=1 || 1 | 0.00044700 | select count(*) from client where broker_id=2 |+----------+------------+-----------------------------------------------+2 rows in set (0.00 sec)查看单条profile mysql> show profile for query 1;+--------------------+------------+| Status | Duration |+--------------------+------------+| (initialization) | 0.00006300 || Opening tables | 0.00001400 || System lock | 0.00000600 || Table lock | 0.00001000 || init | 0.00002200 || optimizing | 0.00001100 || statistics | 0.00009300 || preparing | 0.00001700 || executing | 0.00000700 || Sending data | 0.00016800 || end | 0.00000700 || query end | 0.00000500 || freeing items | 0.00001200 || closing tables | 0.00000800 || logging slow query | 0.00000400 |+--------------------+------------+15 rows in set (0.00 sec)mysql> alter table t engine=myisam;Query OK, 112050 rows affected (0.64 sec)Records: 112050 Duplicates: 0 Warnings: 0mysql> show profiles;+----------+------------+-----------------------------------------------+| Query_ID | Duration | Query |+----------+------------+-----------------------------------------------+| 0 | 0.00007300 | set profiling=1 || 1 | 0.00044700 | select count(*) from client where broker_id=2 || 2 | 0.00003400 | set profiling=0 || 3 | 0.00007400 | set profiling=1 || 4 | 0.63789700 | alter table t engine=myisam || 5 | 0.00004000 | set profiling=0 |+----------+------------+-----------------------------------------------+6 rows in set (0.00 sec)mysql> show profile for query 4;+----------------------+------------+| Status | Duration |+----------------------+------------+| (initialization) | 0.00002900 || checking permissions | 0.00000800 || init | 0.00004000 || Opening table | 0.00009400 || System lock | 0.00000500 || Table lock | 0.00000700 || setup | 0.00004200 || creating table | 0.00195800 || After create | 0.00010900 || copy to tmp table | 0.52264500 || rename result table | 0.11289400 || end | 0.00004600 || query end | 0.00000700 || freeing items | 0.00001300 |+----------------------+------------+14 rows in set (0.00 sec)查看cpu资源等信息 mysql> show profile cpu for query 4;+----------------------+------------+------------+------------+| Status | Duration | CPU_user | CPU_system |+----------------------+------------+------------+------------+| (initialization) | 0.00002900 | 0.00000000 | 0.00000000 || checking permissions | 0.00000800 | 0.00000000 | 0.00000000 || init | 0.00004000 | 0.00000000 | 0.00000000 || Opening table | 0.00009400 | 0.00100000 | 0.00000000 || System lock | 0.00000500 | 0.00000000 | 0.00000000 || Table lock | 0.00000700 | 0.00000000 | 0.00000000 || setup | 0.00004200 | 0.00000000 | 0.00000000 || creating table | 0.00195800 | 0.00000000 | 0.00100000 || After create | 0.00010900 | 0.00000000 | 0.00000000 || copy to tmp table | 0.52264500 | 0.55591600 | 0.04199300 || rename result table | 0.11289400 | 0.00199900 | 0.00000000 || end | 0.00004600 | 0.00000000 | 0.00000000 || query end | 0.00000700 | 0.00000000 | 0.00000000 || freeing items | 0.00001300 | 0.00000000 | 0.00000000 |+----------------------+------------+------------+------------+14 rows in set (0.00 sec)其他属性列表 * ALL - displays all information* BLOCK IO - displays counts for block input and output operations* CONTEXT SWITCHES - displays counts for voluntary and involuntary context switches* IPC - displays counts for messages sent and received* MEMORY - is not currently implemented* PAGE FAULTS - displays counts for major and minor page faults* SOURCE - displays the names of functions from the source code, together with the name and line number of the file in which the function occurs* SWAPS - displays swap counts设定profiling保存size mysql> show variables where variable_name='profiling_history_size'; # 默认15条 关闭 mysql> set profiling=0;