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数据库用户的密码有效期”PASSWORD_LIFE_TIME“为180天，过了180天应用就启动不了，修改如下
[oracle@zhongwc11g ~]$ sqlplus / as sysdbaSQL*Plus: Release 11.2.0.3.0 Production on Wed Nov 28 16:02:33 2012Copyright (c) 1982, 2011, Oracle. All rights reserved.Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsSQL> SELECT resource_type,limit FROM dba_profiles WHERE profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME';RESOURCE LIMIT
-------- ----------------------------------------
PASSWORD 180SQL> ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;Profile altered.SQL> SELECT resource_type,limit FROM dba_profiles WHERE profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME';RESOURCE LIMIT
-------- ----------------------------------------
PASSWORD UNLIMITED在Oracle11g默认配置下，如果单个帐户连续10次登录失败，系统将会锁定帐户，只能通过对帐户解锁。如下可以设置单个用户连续登录失败的次数为不限制。
[oracle@zhongwc11g ~]$ sqlplus sys/oracle@joy as sysdbaSQL*Plus: Release 11.2.0.3.0 Production on Wed Nov 28 16:04:41 2012Copyright (c) 1982, 2011, Oracle. All rights reserved.Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsSQL> select LIMIT from dba_profiles where PROFILE='DEFAULT' and RESOURCE_NAME='FAILED_LOGIN_ATTEMPTS';LIMIT
----------------------------------------
10SQL> ALTER PROFILE DEFAULT LIMIT FAILED_LOGIN_ATTEMPTS UNLIMITED;Profile altered.SQL> select LIMIT from dba_profiles where PROFILE='DEFAULT' and RESOURCE_NAME='FAILED_LOGIN_ATTEMPTS';LIMIT
----------------------------------------
UNLIMITEDSQL> 在Oracle11g中，创建数据库时默认会打开审计功能，默认的audit会记录session登录数据库的信息、数据库关闭/启动和用户授权等信息。大量审计记录有可能写满系统表空间，导致数据库异常。
若audit_trail的值为DB表示进行审计，并将审计记录存储在数据库中，默认记录在sys.aud$表中。详细的审计记录信息可以查看DBA_AUDIT_TRAIL和DBA_COMMON_AUDIT_TRAIL这两个数据字典视图。
[oracle@zhongwc11g ~]$ sqlplus / as sysdbaSQL*Plus: Release 11.2.0.3.0 Production on Wed Nov 28 16:08:56 2012Copyright (c) 1982, 2011, Oracle. All rights reserved.Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsSQL> show parameter audit_trail;NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
audit_trail string DB
SQL> select action_name, count(*) from dba_audit_trail group by action_name;ACTION_NAME COUNT(*)
---------------------------- ----------
LOGON 11
LOGOFF 11SQL> truncate table sys.aud$; --清空审计表Table truncated.SQL> alter system set audit_trail=none scope=spfile;System altered.SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.Total System Global Area 3340451840 bytes
Fixed Size 2232960 bytes
Variable Size 1811942784 bytes
Database Buffers 1509949440 bytes
Redo Buffers 16326656 bytes
Database mounted.
Database opened.
SQL> show parameter audit_trail;NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
audit_trail string NONE
SQL> select action_name, count(*) from dba_audit_trail group by action_name;no rows selectedSQL> 在Oraclellg中，系统自带回收站。删除的表、视图，都会备存放回收站，时间久了，回收站就会比较乱，对数据库的其他操作可能会造成影响。删除表或视图时，就会永久删除，不存放在回收站。
[oracle@zhongwc11g ~]$ sqlplus / as sysdbaSQL*Plus: Release 11.2.0.3.0 Production on Wed Nov 28 16:11:35 2012Copyright (c) 1982, 2011, Oracle. All rights reserved.Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsSQL> show parameter recyclebinNAME TYPE VALUE
------------------------------------ ----------- ------------------------------
recyclebin string on
SQL> alter system set recyclebin= off scope=spfile;System altered.SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.Total System Global Area 3340451840 bytes
Fixed Size 2232960 bytes
Variable Size 1811942784 bytes
Database Buffers 1509949440 bytes
Redo Buffers 16326656 bytes
Database mounted.
Database opened.
SQL> show parameter recyclebinNAME TYPE VALUE
------------------------------------ ----------- ------------------------------
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