oracle 11g sysaux表空间使用率非常高的问题解决

一般来讲除开业务数据存放的表空间，DBA要着重关注SYSTEM,SYSAUX,UNDO,TEMP表空间，SYSTEM表空间的大小一般是衡定的，UNDO和TEMP表空间的大小由数据库的业务情况决定，而SYSAUX表空间在默认条件下你如果不做任何配置，随着时间的推移，会膨胀的越来越大！SYSAUX表空间做为SYSTEM表空间的辅助表空间，主要存放EM相关的内容以及表统计信息，AWR快照，审计信息等，个人认为，如果你的SYSAUX表空间大小超过2G，那么该考虑让他减肥了！

一：使用下列语句查询表空间使用率

SELECT * 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','UNDOTBS1','TEMP');

二：查询SYSAUX表空间内各个分类项目占存储空间的比重，很明显可以看出来AWR快照占用了2G左右的空间，统计信息为149M左右，同时数据库关闭了审计audit_trail，所以审计表aud$不占空间

SELECT occupant_name "Item",
space_usage_kbytes / 1048576 "Space Used (GB)",
schema_name "Schema",
move_procedure "Move Procedure"
FROM v$sysaux_occupants
ORDER BY 1

~~~~~~~~~~~~~~临时删除的办法~~~~~~~~~~~~~~~··

truncate table WRH$_ACTIVE_SESSION_HISTORY;
truncate table WRH$_EVENT_HISTOGRAM;
truncate table WRH$_SQLSTAT;
truncate table WRH$_LATCH_MISSES_SUMMARY;
truncate table WRH$_LATCH;
truncate table WRH$_SYSSTAT;
truncate table WRH$_SEG_STAT;
truncate table WRH$_PARAMETER;
truncate table WRH$_SYSTEM_EVENT;
truncate table WRH$_SQL_PLAN;
truncate table WRH$_DLM_MISC;
truncate table WRH$_SERVICE_STAT;
truncate table WRH$_TABLESPACE_STAT;
truncate table WRH$_ROWCACHE_SUMMARY;
truncate table WRH$_MVPARAMETER;

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~···

select 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;

oracle 11g sysaux表空间使用率非常高的问题解决

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