-- Check if slow query is enabled
SHOW VARIABLES LIKE '%slow_query_log%' ;
-- 1: Enable 0: Disable
SET GLOBAL slow_query_log = 1
-- View slow query log file save path
SHOW VARIABLES LIKE 'slow_query_log_file'
-- View the query threshold for slow queries Unit: milliseconds >long_query_time
SHOW VARIABLES LIKE 'long_query_time'
-- Set the query time threshold
SET GLOBAL long_query_time = 2
-- Re-open a connection after setting, otherwise it will still be the original value
SHOW VARIABLES LIKE 'long_query_time'
-- View the value after setting the value of the current setting
SHOW GLOBAL VARIABLES LIKE 'long_query_time'
-- The parameter is the storage method of the specified log
SHOW VARIABLES LIKE 'log_output'
-- The default is FILE, and TABLE can be set -- MySQL database supports two log storage methods at the same time, which can be separated by commas when configuring, such as: log_output='FILE, TABLE'
SET GLOBAL log_output='FILE,TABLE';
-- Queries that do not use indexes are also recorded in the slow query log. In fact, sql using full index scan will also be recorded in the slow query log.
SHOW VARIABLES LIKE 'log_queries_not_using_indexes';
-- Queries that set unused indexes are also logged in the slow query log
SET GLOBAL log_queries_not_using_indexes=1;
-- The system variable log_slow_admin_statements indicates whether to record slow management statements such as ANALYZE TABLE and ALTER TABLE in the slow query log
SHOW VARIABLES LIKE 'log_slow_admin_statements';
-- 如果你想查询有多少条慢查询记录，可以使用系统变量。
SHOW GLOBAL STATUS LIKE '%Slow_queries%';
参考地址：http://mp.weixin.qq.com/s?__biz=MzA5ODM5MDU3MA==&mid=2650862020&idx=1&sn=dd5178f58e27fc0b9deec83d40090b6f&scene=1&srcid=0917UYBkHvB1duZxHcERoG2l#rd
http://www.linuxidc.com/Linux/2012-08/69398.htm
-- binlog
http://www.cnblogs.com/xionghui/archive/2012/03/11/2389792.html