AWR快照管理

创建快照：

SQL> exec dbms_workload_repository.create_snapshot();

删除快照：

SQL> exec dbms_workload_repository.drop_snapshot_range(low_snap_id=>,high_snap_id=>,dbid=>);

修改快照设置：

SQL> exec dbms_workload_repository.modify_snapshot_settings(retention=>,interval=>,topsql=>,dbid=>);

查看快照：

SQL> select snap_id,dbid,instance_number,startup_time,begin_interval_time,end_interval_time,flush_elapsed,snap_level,error_count,snap_flag,snap_timezone from dba_hist_snapshot;

 SNAP_ID       DBID INSTANCE_NUMBER STARTUP_TIME              BEGIN_INTERVAL_TIME       END_INTERVAL_TIME         FLUSH_ELAPSED      SNAP_LEVEL ERROR_COUNT  SNAP_FLAG SNAP_TIMEZONE
-------- ---------- --------------- ------------------------- ------------------------- ------------------------- ------------------ ---------- ----------- ---------- -------------
                     -OCT- 08.41.58.000 AM -OCT- 09.00.04.802 PM -OCT- 10.00.06.349 PM + ::00.1                                 + ::

SQL>