oracle 11G AWR不自動清理

標籤：oracle awr不自動清理

理論上AWR資料應當根據保留時間,自動清理,但是實際上,經常碰到這樣的:

col segment_name for a32;set linesize 500;set pagesize 500;with t1 as (select round(sum(bytes)/1024/1024) MB,segment_name from dba_segments where owner=‘SYS‘ group by segment_nameorder by 1 desc )select * from t1 where rownum<16;

然後WRH$開頭的幾個表佔十幾個G的情況,也就是AWR資料並沒有完全被清理掉,檢查策略一切正常:

 SQL> select INSTANCE_NUMBER, min(SAMPLE_TIME), max(SAMPLE_TIME) from WRH$_ACTIVE_SESSION_HISTORY group by INSTANCE_NUMBER;  2  INSTANCE_NUMBER MIN(SAMPLE_TIME)                                                            MAX(SAMPLE_TIME)---------------  -------------------------            --------------------------------------------------              1 25-MAY-16 08.14.48.613 PM                                                   28-MAR-18 08.56.02.944 AMSQL>  select snap_interval,retention from dba_hist_wr_control;SNAP_INTERVAL                                                               RETENTION------------------------------------ ---------------------------------------------------------------------------+00000 01:00:00.0                                                           +00008 00:00:00.0SQL>  select min(snap_id),max(snap_id) from WRH$_EVENT_HISTOGRAM;MIN(SNAP_ID) MAX(SNAP_ID)------------ ------------           1        16015

MOS查一下BUG號14084247,從 11.2.0.3之後幾乎都有這個問題,並且打了14084247 之後,貌似也不能解決,MOS又發一篇文章,手動清理,DOCID387914.1,步驟如下:
1檢查分區情況

SELECT owner,  segment_name,  partition_name,  segment_type,  bytes/1024/1024/1024 Size_GBFROM dba_segmentsWHERE segment_name=‘WRH$_ACTIVE_SESSION_HISTORY‘;

2 修改隱含參數:
alter session set "_swrf_test_action" = 72;
3 再次檢查分區情況
4 統計各個WRH表的最大,最小snap_id

set serveroutput on declare CURSOR cur_part IS SELECT partition_name from dba_tab_partitions WHERE table_name = ‘WRH$_ACTIVE_SESSION_HISTORY‘; query1 varchar2(200); query2 varchar2(200); TYPE partrec IS RECORD (snapid number, dbid number); TYPE partlist IS TABLE OF partrec; Outlist partlist; begin dbms_output.put_line(‘PARTITION NAME SNAP_ID DBID‘); dbms_output.put_line(‘--------------------------- ------- ----------‘); for part in cur_part loop query1 := ‘select min(snap_id), dbid from sys.WRH$_ACTIVE_SESSION_HISTORY partition (‘||part.partition_name||‘) group by dbid‘; execute immediate query1 bulk collect into OutList; if OutList.count > 0 then for i in OutList.first..OutList.last loop dbms_output.put_line(part.partition_name||‘ Min ‘||OutList(i).snapid||‘ ‘||OutList(i).dbid); end loop; end if; query2 := ‘select max(snap_id), dbid from sys.WRH$_ACTIVE_SESSION_HISTORY partition (‘||part.partition_name||‘) group by dbid‘; execute immediate query2 bulk collect into OutList; if OutList.count > 0 then for i in OutList.first..OutList.last loop dbms_output.put_line(part.partition_name||‘ Max ‘||OutList(i).snapid||‘ ‘||OutList(i).dbid); dbms_output.put_line(‘---‘); end loop; end if; end loop; end; /

5 刪除不需要的資料

DBMS_WORKLOAD_REPOSITORY.DROP_SNAPSHOT_RANGE(
low_snap_id IN NUMBER,
high_snap_id IN NUMBER
dbid IN NUMBER DEFAULT NULL);

6 運行 @?/rdbms/admin/awrinfo.sql再次檢查下
7 最後建議重啟一下MMON重新整理:

alter system set "_swrf_mmon_flush"=false; alter system set "_swrf_mmon_flush"=true; 

oracle 11G AWR不自動清理