问题现象：SYSTEM表空间使用率超99%，前期设计时SYSTEM表空间是10G固定大小不允许自动扩展。

1.查询SYSTEM表空间的使用率

set linesize 200

col TABLESPACE_NAME for a25

col SUM_SPACE(M) for a20

col USED_SPACE(M) for a20

col USED_RATE(%) for a20

col FREE_SPACE(M) for a20

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(+)

  AND D.TABLESPACE_NAME = 'SYSTEM';

2.查询SYSTEM表空间中各个段占用空间情况

SELECT OWNER, SEGMENT_NAME, SEGMENT_TYPE, SUM(BYTES)/1024/1024

  FROM DBA_SEGMENTS

 WHERE TABLESPACE_NAME = 'SYSTEM'

 GROUP BY OWNER, SEGMENT_NAME, SEGMENT_TYPE

 ORDER BY 4;

3.截断占用空间最大的AUD$表(需要和DBA确认后操作)

truncate table AUD$;

4.查询AUD$表的表空间

 SELECT OWNER, TABLE_NAME, TABLESPACE_NAME

  FROM DBA_TABLES

   WHERE TABLE_NAME = 'AUD$'

   AND OWNER = 'SYS';

5.更改AUD$表的表空间为其他表空间(选做)

BEGIN

 DBMS_AUDIT_MGMT.SET_AUDIT_TRAIL_LOCATION(

  AUDIT_TRAIL_TYPE => DBMS_AUDIT_MGMT.AUDIT_TRAIL_AUD_STD,

  AUDIT_TRAIL_LOCATION_VALUE => '&AUD_TBS_NAME');

END;

/