--如果需要的话DBA可以通过DBMS_WORKLOAD_REPOSITORY过程手动创建、删除或修改snapshots.

--提示调用DBMS_WORKLOAD_REPOSITORY包需要拥有DBA权限。

--1.手动创建Snapshots 手动创建Snapshots通过DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT过程

--例如

exec dbms_workload_repository.create_snapshot();

-- 然后可以通过 DBA_HIST_SNAPSHOT 视图查看刚刚创建的Snapshots信息。

SELECT * FROM DBA_HIST_SNAPSHOT;

-- 2手动删除Snapshots

--删除Snapshots是使用DBMS_WORKLOAD_REPOSITORY包的另一个过程DROP_SNAPSHOT_RANGE 该过程在执行时可以通过指定snap_id的范围的方式一次删除多个Snapshot

--例如

select count(0) from dba_hist_snapshot where snap_id between 6770 and 6774;

select max(snap_id) from dba_hist_snapshot;

select dbid from v$database;

exec dbms_workload_repository.drop_snapshot_range(low_snap_id => 6770,high_snap_id => 6774,dbid => 4059638244);

--或者

begin

dbms_workload_repository.drop_snapshot_range(

low_snap_id => 6770,

high_snap_id => 6774,

dbid => 4059638244);

end;

select count(0) from dba_hist_snapshot where snap_id between 6770 and 6774;