ORA-10456: cannot open standby database; media recovery session may be in progress

本文介绍了解决Oracle数据库中10456错误的方法。此错误通常发生在尝试打开处于介质恢复过程中的备用数据库时。文章通过取消正在进行的恢复会话并使用特定命令打开数据库来解决该问题。

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http://neeraj-dba.blogspot.com/2011/10/ora-10456-cannot-open-standby-database.html

Once while starting my standby database i found that database is not opening in normal mode. It throws the error-10456 :cannot standby database. 

On performing some R&D and googling comes to the conclusion that this error is generally occurs because a media recovery or RMAN session may have been in progress on a mounted instance of a standby database when an attempt was made to open the standby database. Hence to solve of this issue we have to cancel any conflicting recovery session and then open the standby database.

Here is the issue what i have experienced .

C:\>sqlplus sys/xxxx@red as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Mon Oct 3 12:47:32 2011
Copyright (c) 1982, 2010, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select * from hr.aa;
select * from hr.aa
                 *
ERROR at line 1:
ORA-01219: database not open: queries allowed on fixed tables/views only

SQL> select name,open_mode from v$database;
NAME           OPEN_MODE
---------      --------------------
NOIDA          MOUNTED

SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-10456: cannot open standby database; media recovery session may be in progress

SQL> alter database recover managed standby database cancel;
Database altered.

SQL> alter database open;
Database altered.

SQL> alter database recover managed standby database using current logfile disconnect ; 
Database altered.

Hence, finally we solve the issues.
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