数据库中如何查看故障时间等待事件、问题sql及会话访问次数

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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, 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 hh34:mi:ss'; select trunc(sample_time, '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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