mysql查找sql耗时瓶颈 show profiles
1、首先查看是否开启profiling功能
SHOW VARIABLES LIKE ‘%pro%‘;
或者
SELECT @@profiling;
2、开启profiling
SET profiling=1;
3、执行sql语句
例如:
SELECT table_schema AS ‘Db Name‘, ROUND( SUM( data_length + index_length ) / 1024 / 1024, 3 ) AS ‘Db Size (MB)‘, ROUND( SUM( data_free ) / 1024 / 1024, 3 ) AS ‘Free Space (MB)‘ FROM information_schema.tables GROUP BY table_schema ;
4、查看结果
SHOW profiles; SHOW profile ALL FOR QUERY 94; 94是查询ID号。 SHOW profiles语法: SHOW PROFILE [type [, type] … ] [FOR QUERY n] [LIMIT row_count [OFFSET offset]] type: ALL | BLOCK IO | CONTEXT SWITCHES | CPU | IPC | MEMORY | PAGE FAULTS | SOURCE | SWAPS
本文转自http://blog.csdn.net/k_scott/article/details/8804384
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