在oracle11g中，数据库的审计功能是默认开启的（这和oracle10g的不一样，10g默认是关闭的），oracle11gR2的官方文档上写的是错的，当上说default是none，而且是审计到DB级别的，这样就会往aud$表里记录统计信息。

问题处理方法：

1.如果审计不是必须的，可以关掉审计功能；

SQL> show parameter audit_trail;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
audit_trail string DB

SQL> alter system set audit_trail=none scope=spfile;

SQL> shut immediate;

SQL>startup

2.删除已有的审计信息

可以直接truncate表aud$,

truncate table SYS.AUD$;

truncate table SYS.AUD$;

3.或者将aud$表移到另外一个表空间下，以减少system表空间的压力和被撑爆的风险。

附：11g中有关audit_trail参数的设置说明：

AUDIT_TRAIL

Property	Description
Parameter type	String
Syntax	AUDIT_TRAIL = { none \| os \| db [, extended] \| xml [, extended] }
Default value	none
Modifiable	No
Basic	No

AUDIT_TRAIL enables or disables database auditing.

Values:

none

Disables standard auditing. This value is the default if the AUDIT_TRAIL parameter was not set in the initialization parameter file or if you created the database using a method other than Database Configuration Assistant. If you created the database using Database Configuration Assistant, then the default is db.
os

Directs all audit records to an operating system file. Oracle recommends that you use the os setting, particularly if you are using an ultra-secure database configuration.
db

Directs audit records to the database audit trail (the SYS.AUD$ table), except for records that are always written to the operating system audit trail. Use this setting for a general database for manageability.

If the database was started in read-only mode with AUDIT_TRAIL set to db, then Oracle Database internally sets AUDIT_TRAIL to os. Check the alert log for details.
db, extended

Performs all actions of AUDIT_TRAIL=db, and also populates the SQL bind and SQL text CLOB-type columns of the SYS.AUD$ table, when available. These two columns are populated only when this parameter is specified.

If the database was started in read-only mode with AUDIT_TRAIL set to db, extended, then Oracle Database internally sets AUDIT_TRAIL to os. Check the alert log for details.
xml

Writes to the operating system audit record file in XML format. Records all elements of the AuditRecord node except Sql_Text and Sql_Bind to the operating system XML audit file.
xml, extended

Performs all actions of AUDIT_TRAIL=xml, and populates the SQL bind and SQL text CLOB-type columns of the SYS.AUD$ table, wherever possible. These columns are populated only when this parameter is specified.

You can use the SQL AUDIT statement to set auditing options regardless of the setting of this parameter.

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oracle11g审计

AUDIT_TRAIL

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