在日常的数据库维护中，经常出现因为数据库登录审计的功能启动,导致system表空间被用满.从而出现异常,一般建议把aud$相关对象迁移到其他表空间,从而避免system被用完的风险.
人工move aud$相关对象

alter table AUDIT$ move tablespace users;
alter table AUDIT_ACTIONS move tablespace users;
alter table AUD$ move tablespace users;
alter table AUD$ move lob(SQLBIND) store as SYS_IL0000000384C00041$$ (tablespace users);
alter table AUD$ move lob(SQLTEXT) store as SYS_IL0000000384C00041$$ (tablespace users);
alter index I_AUDIT rebuild online tablespace users;
alter index I_AUDIT_ACTIONS rebuild online tablespace users;
--可能修改值(index和lob index)
SQL> select COLUMN_NAME,index_name from dba_lobs where owner='SYS' and table_name='AUD$';
COLUMN_NAME                              INDEX_NAME
---------------------------------------- ------------------------------
SQLBIND                                  SYS_IL0000000384C00040$$
SQLTEXT                                  SYS_IL0000000384C00041$$
SQL> SELECT INDEX_NAME FROM DBA_INDEXES WHERE TABLE_NAME='AUD$';
INDEX_NAME
------------------------------
SYS_IL0000000384C00040$$
SYS_IL0000000384C00041$$
SQL> SELECT INDEX_NAME FROM DBA_INDEXES WHERE TABLE_NAME='AUDIT$';
INDEX_NAME
------------------------------
I_AUDIT
SQL>  SELECT INDEX_NAME FROM DBA_INDEXES WHERE TABLE_NAME='AUDIT_ACTIONS';
INDEX_NAME
------------------------------
I_AUDIT_ACTIONS

DBMS_AUDIT_MGMT实现迁移

conn / as sysdba
BEGIN
DBMS_AUDIT_MGMT.SET_AUDIT_TRAIL_LOCATION(audit_trail_type => DBMS_AUDIT_MGMT.AUDIT_TRAIL_DB_STD,
audit_trail_location_value => 'USERS');
END;
/

验证DBMS_AUDIT_MGMT效果

SQL> select segment_name,tablespace_name from dba_segments where
  2  segment_name in('AUD$','SYS_IL0000000384C00040$$','SYS_IL0000000384C00041$$',
  3  'AUDIT$','I_AUDIT','AUDIT_ACTIONS','I_AUDIT_ACTIONS');
SEGMENT_NAME                                                                      TABLESPACE_NAME
--------------------------------------------------------------------------------- ------------------------------
AUDIT_ACTIONS                                                                     SYSTEM
AUDIT$                                                                            SYSTEM
AUD$                                                                              SYSTEM
SYS_IL0000000384C00041$$                                                          SYSTEM
SYS_IL0000000384C00040$$                                                          SYSTEM
I_AUDIT_ACTIONS                                                                   SYSTEM
I_AUDIT                                                                           SYSTEM
SQL> BEGIN
  2  DBMS_AUDIT_MGMT.SET_AUDIT_TRAIL_LOCATION(audit_trail_type => DBMS_AUDIT_MGMT.AUDIT_TRAIL_DB_STD,
  3  audit_trail_location_value => 'USERS');
  4  END;
  5  /
PL/SQL procedure successfully completed.
SQL> select segment_name,tablespace_name from dba_segments where
  2   segment_name in('AUD$','SYS_IL0000000384C00040$$','SYS_IL0000000384C00041$$',
  3   'AUDIT$','I_AUDIT','AUDIT_ACTIONS','I_AUDIT_ACTIONS');
SEGMENT_NAME                                                                      TABLESPACE_NAME
--------------------------------------------------------------------------------- ------------------------------
AUDIT_ACTIONS                                                                     SYSTEM
AUDIT$                                                                            SYSTEM
AUD$                                                                              USERS
SYS_IL0000000384C00041$$                                                          USERS
SYS_IL0000000384C00040$$                                                          USERS
I_AUDIT_ACTIONS                                                                   SYSTEM
I_AUDIT                                                                           SYSTEM

通过试验证明DBMS_AUDIT_MGMT就是迁移了AUD$表中相关对象,对于和审计相关的其他几个对象并未迁移到其他表空间

aud$相关说明
1.DBMS_AUDIT_MGMT版本支持情况

It is still not supported (but it works) to use it on 10.2.0.4 and 11.1.0.7 for non-Audit Vault Environment.
Using RDBMS with Audit Vault, it is supported  for 10.2.0.4.0 and 11.1.0.7.0
as the DBMS_AUDIT_MGMT Package is provided to be used with an Audit Vault Environment.

2.该包可以实现在线迁移，特别是在高业务的系统中,可以实现在线迁移,而人工的move操作不能实现在线处理
3.对于AUD$对象，如果登录审计数据不是非常重要,可以通过truncate来解决一时的问题，在业务高的系统，可能truncate不能马上操作成功，可以尝试使用11gr2的新特性alter session set ddl_lock_timeout = 10;来实现自动ddl尝试
4.如果确定不需要登录审计功能，可以通过设置audit_trail=none来关闭(需要重启实例)