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 cache
show 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)