1.查看Oracle System表空间使用率http://www.cndba.cn/hbhe0316/article/4763http://www.cndba.cn/hbhe0316/article/4763

select b.tablespace_name "表空间",
       b.bytes / 1024 / 1024 "大小M",
       (b.bytes - sum(nvl(a.bytes, 0))) / 1024 / 1024 "已使用M",
       substr((b.bytes - sum(nvl(a.bytes, 0))) / (b.bytes) * 100, 1, 5) "利用率"
  from dba_free_space a, dba_data_files b
 where a.file_id = b.file_id
   and b.tablespace_name = 'SYSTEM'
 group by b.tablespace_name, b.file_name, b.bytes
 order by b.tablespace_name;

 表空间                              大小M    已使用M 利用率
------------------------------ ---------- ---------- --------------------
SYSTEM                                910    900.875 98.99

2.查看占用表空间前十的对象http://www.cndba.cn/hbhe0316/article/4763http://www.cndba.cn/hbhe0316/article/4763

SELECT *
  FROM (SELECT SEGMENT_NAME, SUM(BYTES) / 1024 / 1024 MB
          FROM DBA_SEGMENTS
         WHERE TABLESPACE_NAME = 'SYSTEM'
         GROUP BY SEGMENT_NAME
         ORDER BY 2 DESC)
 WHERE ROWNUM < 10;

3.如果是审计相关的表SYS.AUD$http://www.cndba.cn/hbhe0316/article/4763http://www.cndba.cn/hbhe0316/article/4763http://www.cndba.cn/hbhe0316/article/4763http://www.cndba.cn/hbhe0316/article/4763

sys@CXMTDB 22:49:00>  truncate table SYS.AUD$;

Table truncated.

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