v$active_session_history
v$active_session_history 相关等待语句：select ash.sql_id, ash.event, trunc(sum(TM_DELTA_TIME) / 1000000,2) TM_DELTA_TIME,--执行时间 trunc(sum(TM_DELTA_CPU_TIME) / 1000000,2) TM_DELTA_C
