分享两个实用SQL--查看故障时间等待事件、问题sql及会话访问次数
分享两个SQL,分享这两个SQL只是实用数基础原型,大家自己自定义条件去做一些调整。看故主要是b2b信息网间等件问及在前面讲过的dba_hist_active_sess_history相关sql上总结出来的比较实用的sql。香港云服务器
DBA_HIST_ACTIVE_SESS_HISTORY
DBA_HIST_ACTIVE_SESS_HISTORY displays the history of the contents of the in-memory active session history of recent system activity. This view contains snapshots of V$ACTIVE_SESSION_HISTORY. See "V$ACTIVE_SESSION_HISTORY" for further interpretation details for many of these columns (except SNAP_ID,待事 DBID, and INSTANCE_NUMBER).





查看故障时间段等待事件、问题sql id及会话访问次数
--alter session set nls_date_format=yyyy-mm-dd hh24:mi:ss; select trunc(sample_time,话访 mi) tm, sql_id, nvl(event,CPU),count(distinct session_id) cnt from dba_hist_active_sess_history where sample_time between to_date(2019-08-22 14:00:00) and to_date(2019-08-22 14:30:00) group by trunc(sample_time, mi), sql_id,nvl(event,CPU) order by cnt desc;
查看该sql相关的等待事件及对应的会话访问次数
select sql_id, nvl(event, CPU), count(distinct session_id) sz from dba_hist_active_sess_history a, dba_hist_snapshot b where sample_time between to_date(2019-08-22 14:00:00) and to_date(2019-08-22 15:00:00) and sql_id = 4ksvn2rgjnhcm and a.snap_id = b.snap_id and a.instance_number = b.instance_number group by sql_id, nvl(event, CPU) order by sz desc;
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