Oracle 11.2.0.4 awr过期快照无法自动清理解决

理论上AWR数据应当根据保留时间,自动清理,但是实际上,经常碰到这样的:

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_name

order by 1 desc )

select * from t1 where rownum<16;

然后WRH$开头的几个表占十几个G的情况,也就是AWR数据并没有完全被清理掉,检查策略一切正常:

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 AM

SQL>  select snap_interval,retention from dba_hist_wr_control;

SNAP_INTERVAL                                                              RETENTION

------------------------------------ ---------------------------------------------------------------------------

+00000 01:00:00.0                                                          +00008 00:00:00.0

select min(snap_id),max(snap_id) ,dbid from sys.WRH$_EVENT_HISTOGRAM group by dbid;

MOS查一下BUG号14084247,从 11.2.0.3之后几乎都有这个问题,并且打了14084247 之后,貌似也不能解决,MOS又发一篇文章,手动清理,DOCID387914.1,步骤如下:

1检查分区情况

SELECT owner,

segment_name,

partition_name,

segment_type,

bytes/1024/1024/1024 Size_GB

FROM dba_segments

WHERE segment_name='WRH$_ACTIVE_SESSION_HISTORY';

2 修改隐含参数:

alter session set "_swrf_test_action" = 72;

3 再次检查分区情况

4 统计各个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 删除不需要的数据

DBMS_WORKLOAD_REPOSITORY.DROP_SNAPSHOT_RANGE(

low_snap_id IN NUMBER,

high_snap_id IN NUMBER

dbid IN NUMBER DEFAULT NULL);

6 运行 @?/rdbms/admin/awrinfo.sql再次检查下

7 最后建议重启一下MMON刷新:

alter system set "_swrf_mmon_flush"=false;

alter system set "_swrf_mmon_flush"=true;

更多Oracle相关信息见 Oracle 专题页面 https://www.linuxidc.com/topicnews.aspx?tid=12

Linux公社的RSS地址 ： https://www.linuxidc.com/rssFeed.aspx

本文永久更新链接地址： https://www.linuxidc.com/Linux/2019-04/158094.htm