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

SELECT 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

SELECT 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

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');

4、查看下使用SYSTEM和SYSAUX表空间的比较大的表有哪些

select * 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。

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 ;

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：

truncate 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

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;

8、删除表

truncate 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

SELECT 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;

以上，

End