bitsCN.com
1. show variables like '%profiling%';(查看profiling信息) 
2. set profiling=1;（开启profiling） 
3. 执行SQL查询 例:select goods_name from ecs_goods where goods_id 
4. show profile for query 4;
show profile 的格式如下：
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 bitsCN.com
