Hiiiii,

I am a new bie in the field of database administration. My oracle Primary database and Standby database is working fine but dut to sudden power failure standby database got shutdown abnormally.
Then i followed this steps:

C:\Documents and Settings>sqlplus

SQL*Plus: Release 10.2.0.4.0 - Production on Mon Oct 17 15:18:58 2011

Copyright (c) 1982, 2007, Oracle. All Rights Reserved.

Enter user-name: /as sysdba
Connected to an idle instance.

SQL> startup nomount
ORACLE instance started.

Total System Global Area 2097152000 bytes
Fixed Size 2214496 bytes
Variable Size 479999392 bytes
Database Buffers 1610612736 bytes
Redo Buffers 4325376 bytes
SQL>
SQL> alter database mount standby database;

Database altered.

SQL> alter database recover managed standby database disconnect from session;

Database altered.
SQL> select process,status from v$managed_standby;

PROCESS STATUS
------------
ARCH CONNECTED
ARCH CONNECTED
RFS IDLE
RFS IDLE

I found that my MRPO process are not running. aftre checking the alert log i found the following errors :

ALTER DATABASE RECOVER managed standby database disconnect from session
MRP0 started with pid=56, OS id=4508
Managed Standby Recovery not using Real Time Apply
Mon Oct 17 15:23:25 2011
Errors in file e:\oracle\product\10.2.0\admin\orcl\bdump\orcl_dbw 0_3300.trc:
ORA-01157: cannot identify/lock data file 1 - see DBWR trace file
ORA-01110: data file 1: '+DATA/orcl/datafile/system.278.757011327'
ORA-17503: ksfdopn:2 Failed to open file +DATA/orcl/datafile/system.278.757011327
ORA-15001: diskgroup "DATA" does not exist or is not mounted
ORA-15077: could not locate ASM instance serving a required diskgroup
ORA-17503: ksfdopn:2 Failed to open file +DATA/orcl/tempfile/temp.291.759608373
ORA-15001: diskgroup "DATA" does not exist or is not mounted
ORA-15077: could not locate ASM instance serving a required diskgroup

Mon Oct 17 15:23:25 2011
Errors in file e:\oracle\product\10.2.0\admin\orcl\bdump\orcl_dbw 0_3300.trc:
ORA-01157: cannot identify/lock data file 2 - see DBWR trace file
ORA-01110: data file 2: '+DATA/orcl/datafile/undotbs1.290.757012481'
ORA-17503: ksfdopn:2 Failed to open file +DATA/orcl/datafile/undotbs1.290.757012481
ORA-15001: diskgroup "DATA" does not exist or is not mounted
ORA-15077: could not locate ASM instance serving a required diskgroup

I m using Oracle 10.2.0.4.0. Can any 1 help me on this because i wont be able to know what and where is the problem?? archives are getting shifted to standby but not getting applied. Please help over this..