Mysql动态打开日志 show profiles详细信息

查看表索引  show index from t_user;  show keys  from t_user;  动态打开general 日志    show global variables like '%general%';  set global general_log = on;     动态打开slow 日志  show global variables like '%slow%';  set global slow_query_log = on;  set global long_query_time = 0.2;    set profiling = on;  或set  profiling = 1;reset query cacheshow profile ;show profiles;mysql> select @@profiling;+-------------+| @@profiling |+-------------+|           0 |+-------------+show profiles;+----------+----------+-------------------------------------+| Query_ID | Duration | Query                               |+----------+----------+-------------------------------------+|        0 | 0.000045 | set profiling = 1                   ||        1 | 0.000071 | select @@profiling                  ||        2 | 0.000087 | drop table if exists t1             ||        3 | 0.031741 | create table t1 (id int not null)   ||        4 | 0.000615 | insert into t1 values (1), (2), (3) ||        5 | 0.000198 | select * from t1                    |+----------+----------+-------------------------------------+根据query_id 查看某个查询的详细时间耗费mysql> show profile for query 2;+----------------------+----------+| Status               | Duration |+----------------------+----------+| starting             | 0.000231 || checking permissions | 0.000015 || checking permissions | 0.000010 || checking permissions | 0.000010 || checking permissions | 0.000014 || Opening tables       | 0.000118 || init                 | 0.000051 || System lock          | 0.000023 || optimizing           | 0.000012 || optimizing           | 0.000019 || statistics           | 0.000039 || preparing            | 0.000034 || Sorting result       | 0.000029 || statistics           | 0.000070 || preparing            | 0.000034 || Creating tmp table   | 0.000038 || Sorting result       | 0.000048 || executing            | 0.000025 || Sending data         | 0.016414 || executing            | 0.000015 || Sending data         | 0.536580 || Creating sort index  | 0.000353 || end                  | 0.000014 || removing tmp table   | 0.000018 || end                  | 0.000014 || query end            | 0.000017 || closing tables       | 0.000011 || removing tmp table   | 0.000176 || closing tables       | 0.000031 || freeing items        | 0.001331 || logging slow query   | 0.000084 || cleaning up          | 0.000028 |+----------------------+----------+32 rows in set, 1 warning (0.00 sec)mysql> show profile cpu for query 2;+----------------------+----------+----------+------------+| Status               | Duration | CPU_user | CPU_system |+----------------------+----------+----------+------------+| starting             | 0.000231 | 0.000000 |   0.000000 || checking permissions | 0.000015 | 0.000000 |   0.000000 || checking permissions | 0.000010 | 0.000000 |   0.000000 || checking permissions | 0.000010 | 0.000000 |   0.000000 || checking permissions | 0.000014 | 0.000000 |   0.000000 || Opening tables       | 0.000118 | 0.000000 |   0.000000 || init                 | 0.000051 | 0.000000 |   0.000000 || System lock          | 0.000023 | 0.000000 |   0.000000 || optimizing           | 0.000012 | 0.000000 |   0.000000 || optimizing           | 0.000019 | 0.000000 |   0.000000 || statistics           | 0.000039 | 0.000000 |   0.000000 || preparing            | 0.000034 | 0.000000 |   0.000000 || Sorting result       | 0.000029 | 0.000000 |   0.000000 || statistics           | 0.000070 | 0.000000 |   0.000000 || preparing            | 0.000034 | 0.000000 |   0.000000 || Creating tmp table   | 0.000038 | 0.000000 |   0.000000 || Sorting result       | 0.000048 | 0.000000 |   0.000000 || executing            | 0.000025 | 0.000000 |   0.000000 || Sending data         | 0.016414 | 0.015998 |   0.000000 || executing            | 0.000015 | 0.000000 |   0.000000 || Sending data         | 0.536580 | 0.539917 |   0.000000 || Creating sort index  | 0.000353 | 0.000000 |   0.000000 || end                  | 0.000014 | 0.000000 |   0.000000 || removing tmp table   | 0.000018 | 0.000000 |   0.000000 || end                  | 0.000014 | 0.000000 |   0.000000 || query end            | 0.000017 | 0.000000 |   0.000000 || closing tables       | 0.000011 | 0.000000 |   0.000000 || removing tmp table   | 0.000176 | 0.000000 |   0.000000 || closing tables       | 0.000031 | 0.000000 |   0.000000 || freeing items        | 0.001331 | 0.001000 |   0.000000 || logging slow query   | 0.000084 | 0.000000 |   0.000000 || cleaning up          | 0.000028 | 0.000000 |   0.000000 |+----------------------+----------+----------+------------+32 rows in set, 1 warning (0.00 sec)mysql> show profile source for query 2;+----------------------+----------+---------------------------+------------------+-------------+| Status               | Duration | Source_function           | Source_file      | Source_line |+----------------------+----------+---------------------------+------------------+-------------+| starting             | 0.000231 | NULL                      | NULL             |        NULL || checking permissions | 0.000015 | check_access              | sql_parse.cc     |        5297 || checking permissions | 0.000010 | check_access              | sql_parse.cc     |        5297 || checking permissions | 0.000010 | check_access              | sql_parse.cc     |        5297 || checking permissions | 0.000014 | check_access              | sql_parse.cc     |        5297 || Opening tables       | 0.000118 | open_tables               | sql_base.cc      |        5069 || init                 | 0.000051 | mysql_prepare_select      | sql_select.cc    |        1050 || System lock          | 0.000023 | mysql_lock_tables         | lock.cc          |         304 || optimizing           | 0.000012 | optimize                  | sql_optimizer.cc |         138 || optimizing           | 0.000019 | optimize                  | sql_optimizer.cc |         138 || statistics           | 0.000039 | optimize                  | sql_optimizer.cc |         362 || preparing            | 0.000034 | optimize                  | sql_optimizer.cc |         485 || Sorting result       | 0.000029 | make_tmp_tables_info      | sql_select.cc    |        5307 || statistics           | 0.000070 | optimize                  | sql_optimizer.cc |         362 || preparing            | 0.000034 | optimize                  | sql_optimizer.cc |         485 || Creating tmp table   | 0.000038 | create_intermediate_table | sql_executor.cc  |         210 || Sorting result       | 0.000048 | make_tmp_tables_info      | sql_select.cc    |        5307 || executing            | 0.000025 | exec                      | sql_executor.cc  |         110 || Sending data         | 0.016414 | exec                      | sql_executor.cc  |         190 || executing            | 0.000015 | exec                      | sql_executor.cc  |         110 || Sending data         | 0.536580 | exec                      | sql_executor.cc  |         190 || Creating sort index  | 0.000353 | sort_table                | sql_executor.cc  |        2504 || end                  | 0.000014 | mysql_execute_select      | sql_select.cc    |        1105 || removing tmp table   | 0.000018 | free_tmp_table            | sql_tmp_table.cc |        1868 || end                  | 0.000014 | free_tmp_table            | sql_tmp_table.cc |        1897 || query end            | 0.000017 | mysql_execute_command     | sql_parse.cc     |        4996 || closing tables       | 0.000011 | mysql_execute_command     | sql_parse.cc     |        5044 || removing tmp table   | 0.000176 | free_tmp_table            | sql_tmp_table.cc |        1868 || closing tables       | 0.000031 | free_tmp_table            | sql_tmp_table.cc |        1897 || freeing items        | 0.001331 | mysql_parse               | sql_parse.cc     |        6433 || logging slow query   | 0.000084 | log_slow_do               | sql_parse.cc     |        1874 || cleaning up          | 0.000028 | dispatch_command          | sql_parse.cc     |        1778 |+----------------------+----------+---------------------------+------------------+-------------+32 rows in set, 1 warning (0.00 sec)