查询各SQL的执行频率

show global status like 'Com_%'            
SHOW session STATUS LIKE 'Com_%'                

global：自数据库上次启动至今的统计结果
session：当前连接的统计结果


show global status like 'Com_select%'
show global status like 'Com_insert%'
show global status like 'Com_update%'
show global status like 'Com_delete%'
show global status like 'Conn%'
show global status like 'Up%'            
show global status like 'Slow%'