SYSTEM表空间过大问题

巡检发现system表空间使用率过高

TABLESPACE_NAME TOTAL FREE USED FREE/TOTAL
------------------------------ ---------- ---------- ---------- ----------
A11_ 28000 9823.0625 18176.9375 .350823661
A11_ 142512 29388.8125 113123.188 .206219915
SYSAUX 5120 3242.8125 1877.1875 .633361816
SYSTEM 5120 767.25 4352.75 .149853516
UNDOTBS1 1595 1021.5 573.5 .640438871
UNDOTBS2 1300 560.25 739.75 .430961538
USERS 5 3.5625 1.4375 .7125

7 rows selected.

检查system表空间中占用空间最大对象

  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;

aud$为审计功能

导出aud$的数据备查后，

 truncate table aud$;