MySQL查找SQL耗时瓶颈 SHOW profiles

SHOW VARIABLES LIKE '%pro%';

SELECT @@profiling;

SET profiling=1;

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 ;

SHOW profiles;

SHOW profile ALL FOR QUERY 94;

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