Oracle 清理AWR報告產生的歷史數據

1. 創建臨時表，保存近幾天的數據 
create table test.awr_bak as select * from sys.WRH$_ACTIVE_SESSION_HISTORY where SAMPLE_TIME>=sysdate-7; 
2. 禁用AWR 
exec dbms_workload_repository.modify_snapshot_settings(interval => 0); 

3.TRUNCATE TABLE sys.WRH$_ACTIVE_SESSION_HISTORY; 

4.TRUNCATE完成後進行insert ，然後 重建索引

5.啓動AWR 
exec dbms_workload_repository.modify_snapshot_settings(interval => 60); 

6.刪除備份表 
drop table  test.awr_bak purge;