oracle 11g sysaux表空間使用率非常高的問題解決

一般來講除開業務數據存放的表空間，DBA要着重關注SYSTEM,SYSAUX,UNDO,TEMP表空間，SYSTEM表空間的大小一般是衡定的，UNDO和TEMP表空間的大小由數據庫的業務情況決定，而SYSAUX表空間在默認條件下你如果不做任何配置，隨着時間的推移，會膨脹的越來越大！SYSAUX表空間做為SYSTEM表空間的輔助表空間，主要存放EM相關的內容以及表統計信息，AWR快照，審計信息等，個人認為，如果你的SYSAUX表空間大小超過2G，那么該考慮讓他減肥了！ 

一：使用下列語句查詢表空間使用率 

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：查詢SYSAUX表空間內各個分類項目占存儲空間的比重，很明顯可以看出來AWR快照占用了2G左右的空間，統計信息為149M左右，同時數據庫關閉了審計audit_trail，所以審計表aud$不占空間 

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

~~~~~~~~~~~~~~臨時刪除的辦法~~~~~~~~~~~~~~~··

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;