11g oracle保留awr几天,oracle 11G AWR不自动清理

末蓝、 2023-01-18 04:29 170阅读 0赞

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

sql> select min(snap\_id),max(snap\_id) from WRH$\_EVENT\_HISTOGRAM;

MIN(SNAP\_ID) MAX(SNAP\_ID)

\------------ ------------

1 16015

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);

@H\_301\_30@

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;

总结

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11g oracle保留awr几天,oracle 11G AWR不自动清理

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