Find out slow SQL of mysql

Find out slow SQL of mysql Recent days, I shocould do a SQL tuning for a mysql database, and I know a bit of mysql db. in order to find the slow SQL, I do the slow_query_log on to collect the slow SQL.

[sql]mysql> show variables like 'slow%';  +---------------------+-------------------------------------------+  | Variable_name       | Value                                     |  +---------------------+-------------------------------------------+  | slow_launch_time    | 2                                         |  | slow_query_log      | ON                                        |  | slow_query_log_file | /opt/mysql_data/mysql/mysql-test-slow.log |  +---------------------+-------------------------------------------+  3 rows in set (0.00 sec)    mysql> set global slow_launch_time=5;  Query OK, 0 rows affected (0.00 sec)    mysql> show variables like 'slow%';  +---------------------+-------------------------------------------+  | Variable_name       | Value                                     |  +---------------------+-------------------------------------------+  | slow_launch_time    | 5                                         |  | slow_query_log      | ON                                        |  | slow_query_log_file | /opt/mysql_data/mysql/mysql-test-slow.log |  +---------------------+-------------------------------------------+  3 rows in set (0.00 sec)  We can read  /opt/mysql_data/mysql/mysql-test-slow.log  to find slow sql.