ORA-19527 reported in Standby Database when starting Managed Recovery (Doc ID 352879.1)

In this Document

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.1 and later
Information in this document applies to any platform.
***Checked for relevance on 17-FEB-2014***

Symptoms

This issue is seen starting in release 10gR2.

Upon starting the Managed Recovery Process in a Standby Database the following Errors may be seen

Thu Oct 27 09:41:47 2005
Attempt to start background Managed Standby Recovery process (ora)
MRP0 started with pid=47, OS id=32094
Thu Oct 27 09:41:47 2005
MRP0: Background Managed Standby Recovery process started (ora)
Managed Standby Recovery not using Real Time Apply
Thu Oct 27 09:41:52 2005
Errors in file /app/oracle/admin/ora/bdump/ora_mrp0_32094.trc:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/u03/oradata/ora/ora_rdo01c.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-00312: online log 1 thread 1: '/u02/oradata/ora/ora_rdo01b.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3

If the files are created then you may then receive the following errors

Thu Oct 27 09:41:52 2005
Errors in file /app/oracle/admin/ora/bdump/ora_mrp0_32094.trc:
ORA-19527: physical standby redo log must be renamed
ORA-00312: online log 1 thread 1: '/ora01/oradata/ora/ora_rdo01a.log'
Clearing online redo logfile 1 complete
Media Recovery Waiting for thread 1 sequence 55
Thu Oct 27 09:41:53 2005
Completed: alter database recover managed standby database disconnect from
session.

You may also see following messages on MRP startup even with log_file_name_convert parameter set

ORA-00312: online log 11 thread 2: '+ARCH_1/p2brp_dr/onlinelog/group_11.285.609666683'
ORA-17503: ksfdopn:2 Failed to open file +ARCH_1/p2brp_dr/onlinelog/group_11.285.609666683
ORA-15012: ASM file '+arch_1.285.609666683' does not exist
ORA-00312: online log 11 thread 2: '+DATA_1/p2brp_dr/onlinelog/group_11.299.609666681'
ORA-17503: ksfdopn:2 Failed to open file +DATA_1/p2brp_dr/onlinelog/group_11.299.609666681
ORA-15012: ASM file '+data_1.299.609666681' does not exist

Cause

This is in fact an Enhancement to the Data Guard Technology introduced in 10.2.0.

The Goal here is to improve speed of Switchover and Failover. In previous Versions a Role Transition would require to clear the Online Redo Logfiles before it can become a Primary Database. Now we attempt to clear the Online Redo Logfiles when starting Managed Recovery.

If the Files exist then they will be cleared, but if they do not exist we report the Error, attempts to create the Online Redo Logfiles and starts Recovery. Even if this is not possible because of different Structure and log_file_name_convert is not set, MRP does not fail; it only raises these Errors.

As an extra Enhancement if the Online Redologs do exist you must specify the log_file_name_convert Parameter even if there is no difference in the Name. This has been implemented to reduce the chances that the Primary Online Redologs are cleared when MRP starts. It is the equivalent of asking - Are you sure you want the logs to be called this....

If the log_file_name_convert parameter is not set then the ORA-19527 is reported and the log file is not cleared at this time..

Solution

Solution to stop both of these errors is to ensure log_file_name_convert is set correctly. If the File Structure is the same on the Primary and Standby Database you can set log_file_name_convert to a dummy Value, eg.

log_file_name_convert = ','