摘要： 1.监控事例的等待： select event,sum(decode(wait_time,0,0,1)) prev, sum(decode(wait_time,0,1,0)) curr,count(*)from v$session_wait group by event order by 4;2.回滚段的争用情况：select name,waits,gets,waits/gets ratio fr... 阅读全文