Errors in file /u01/app/oracle/db10g/rdbms/log/prod_lgwr_26003.trc:
ORA-16072: a minimum of one standby database destination is required
LGWR: terminating instance due to error 16072
Instance terminated by LGWR, pid = 26003
原因是虽然在主库初始化文件里删除了DG备库相关的初始化参数，但是忘了修改原来的maximize availability模式，因此主库不让启动。
具体解决办法如下：
[oracle@dbserv1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Sun Dec 1 12:53:48 2013
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 536870912 bytes
Fixed Size 1220408 bytes
Variable Size 188743880 bytes
Database Buffers 339738624 bytes
Redo Buffers 7168000 bytes
Database mounted.
SQL> alter database set standby to maximize performance;
Database altered.
SQL> alter database open;
Database altered.
SQL>
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