Oracle 扩展sysaux,oracle 清理SYSAUX表空间

简介

oracle 清理SYSAUX表空间

处理思路

1、查询表空间使用情况1

17SELECT UPPER(F.TABLESPACE_NAME) "表空间名",

D.TOT_GROOTTE_MB "表空间大小(M)",

D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",

TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,2),'990.99') "使用比",

F.TOTAL_BYTES "空闲空间(M)",

F.MAX_BYTES "最大块(M)"

FROM (SELECT TABLESPACE_NAME,

ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,

ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES

FROM SYS.DBA_FREE_SPACE

GROUP BY TABLESPACE_NAME) F,

(SELECT DD.TABLESPACE_NAME,

ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB

FROM SYS.DBA_DATA_FILES DD

GROUP BY DD.TABLESPACE_NAME) D

WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME

ORDER BY 4 DESC;

2、查看一下表空间是否开启自动扩展功能1

4SELECT T.TABLESPACE_NAME,D.FILE_NAME,D.AUTOEXTENSIBLE,D.BYTES,D.MAXBYTES,D.STATUS

FROM DBA_TABLESPACES T,DBA_DATA_FILES D

WHERE T.TABLESPACE_NAME =D.TABLESPACE_NAME

ORDER BY TABLESPACE_NAME,FILE_NAME;

3、查询下SYSTEM和SYSAUX表空间的使用率1

38SELECT * FROM (

SELECT D.TABLESPACE_NAME,

SPACE || 'M' "SUM_SPACE(M)",

BLOCKS "SUM_BLOCKS",

SPACE - NVL (FREE_SPACE, 0) || 'M' "USED_SPACE(M)",

ROUND ( (1 - NVL (FREE_SPACE, 0) / SPACE) * 100, 2) || '%'

"USED_RATE(%)",

FREE_SPACE || 'M' "FREE_SPACE(M)"

FROM ( SELECT TABLESPACE_NAME,

ROUND (SUM (BYTES) / (1024 * 1024), 2) SPACE,

SUM (BLOCKS) BLOCKS

FROM DBA_DATA_FILES

GROUP BY TABLESPACE_NAME) D,

( SELECT TABLESPACE_NAME,

ROUND (SUM (BYTES) / (1024 * 1024), 2) FREE_SPACE

FROM DBA_FREE_SPACE

GROUP BY TABLESPACE_NAME) F

WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+)

UNION ALL

SELECT D.TABLESPACE_NAME,

SPACE || 'M' "SUM_SPACE(M)",

BLOCKS SUM_BLOCKS,

USED_SPACE || 'M' "USED_SPACE(M)",

ROUND (NVL (USED_SPACE, 0) / SPACE * 100, 2) || '%' "USED_RATE(%)",

NVL (FREE_SPACE, 0) || 'M' "FREE_SPACE(M)"

FROM ( SELECT TABLESPACE_NAME,

ROUND (SUM (BYTES) / (1024 * 1024), 2) SPACE,

SUM (BLOCKS) BLOCKS

FROM DBA_TEMP_FILES

GROUP BY TABLESPACE_NAME) D,

( SELECT TABLESPACE_NAME,

ROUND (SUM (BYTES_USED) / (1024 * 1024), 2) USED_SPACE,

ROUND (SUM (BYTES_FREE) / (1024 * 1024), 2) FREE_SPACE

FROM V$TEMP_SPACE_HEADER

GROUP BY TABLESPACE_NAME) F

WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+)

ORDER BY 1)

WHERE TABLESPACE_NAME IN ('SYSAUX','SYSTEM');

4、查看下使用SYSTEM和SYSAUX表空间的比较大的表有哪些1

4select * from (

select segment_name,sum(bytes)/1024/1024 total_mb,tablespace_name from dba_segments where tablespace_name in

('SYSTEM','SYSAUX') group by segment_name,tablespace_name order by 2 desc)

where rownum <=20;

5、可见，大表大部分都是AUD $和$ WRH开头的AWR基表，AUD $使用SYSTEM表空间，AWR的基表使用SYSAUX表空间，下面再查看下SYSAUX表空间的使用情况，可以通过V $ SYSAUX_OCCUPANTS视图查询到。1

6SELECT occupant_name "Item",

space_usage_kbytes / 1048576 "Space Used (GB)",

schema_name "Schema",

move_procedure "Move Procedure"

FROM v$sysaux_occupants

ORDER BY 1 ;

6、首先清理审计的数据，如果要保留部分AUD $里面记录的审计数据，可以把想要的数据插入到一张临时表，然后直接截断这张表就可以了，截断操作会直接回收AUD $占用的空间。

但由于是正式库，怕truncate操作会带来其他的一些问题，不直接做truncate，而是执行以下命令：1

6truncate table sys.aud$ reuse storage;

alter table sys.aud$ deallocate unused keep 8640m;

alter table sys.aud$ deallocate unused keep 7000m;

alter table sys.aud$ deallocate unused keep 6000m;

...

alter table sys.aud$ deallocate unused keep 10m;

truncate过程1-2分钟之内结束，最后sys.aud$变成10M。

解释：思路就是在前面执行truncate的时候，降低了HWM但没释放空间。 alter table sys.aud$ deallocate unused keep 6000m; 这个命令，就是一点一点释放HWM之上的自由空间，最后保留10m空间，因为我们这个表是要继续使用，而不是要删除。

7、清理WRH$表生成删除段内容语句1

6select distinct 'truncate table '||segment_name||';',s.bytes/1024/1024

from dba_segments s

where s.segment_name like 'WRH$%'

and segment_type in ('TABLE PARTITION', 'TABLE')

and s.bytes/1024/1024>100

order by s.bytes/1024/1024/1024 desc;

8、删除表1

10truncate table WRH$_ACTIVE_SESSION_HISTORY;

truncate table WRH$_EVENT_HISTOGRAM;

truncate table WRH$_LATCH;

truncate table WRH$_SQLSTAT;

truncate table WRH$_SYSSTAT;

truncate table WRH$_PARAMETER;

truncate table WRH$_SQL_PLAN;

truncate table WRH$_LATCH_MISSES_SUMMARY;

truncate table WRH$_SEG_STAT;

truncate table WRH$_SYSTEM_EVENT;

9、验证表空间1