Show profiles of MySQL is used.

To analyze sql The execution time and performance . We can use show profiles Analyze .

First check to see if it is on ：

show VARIABLES like "profiling"

If it is turned on, the value will be ON. If it is not enabled, use the following statement to enable .

set profiling='on'

Query the execution of the latest statement ：

SHOW PROFILES

The result of execution is ：

You can see query_id by 127 The implementation of 1.12 second . So what causes it to execute slowly can be queried with the following statement

SHOW PROFILE cpu,block io for query 127

  The result of execution is ：

You can see that this statement takes a lot of time to execute . Because the database has 50 Ten thousand data . Then sort him .