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Oracle研究中心案例分析：运维DBA反映巡检Oracle RAC数据库时发现alert日志中出现报错：ORA-00245: control file backup operation failed。

关于MOS关于RAC环境中ORA-00245报错的说明。

ORA-245: In RAC environment from 11.2 onwards Backup Or Snapshot controlfile needs to be in shared location (文档 ID 1472171.1)

修改时间:2013-11-11

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类型:ALERT

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In this Document

Description

Occurrence

Symptoms

Workaround

Patches

History

References

APPLIES TO:

Oracle Database – Enterprise Edition – Version 11.2.0.1.0 and later

Information in this document applies to any platform.

This issue is only applicable to RAC database.

From 11gR2 onwards, the controlfile backup happens without holding the controlfile enqueue. For non-RAC database, this doesn’t change anything. But for RAC database, due to the changes made to the controlfile backup mechanism in 11gR2, any instance in the cluster may write to the snapshot controlfile. Due to this snapshot controlfile need to be visible to all instances.

The snapshot controlfile MUST be accessible by all nodes of a RAC database, if the snapshot controlfile does not reside on a shared device error will be raised at the time of RMAN backup while taking snapshot of controlfile.

This applies to backing up controlfile using sqlplus / having autobackup of controlfile configured on non

shared location.

ORA-245 error message description

—————————————-

00245, 00000, “control file backup operation failed”

*Cause: Failed to create a control file backup because some process

signaled an error during backup creation.

*Action: Check alert files for further information. This usually happens

because some process could not access the backup file during

backup creation. Any process of any instance that starts a

read/write control file transaction must have an access to the

backup control file during backup creation.

DESCRIPTION

1. In RAC environment controlfile autobackup fails with ora-0245

Autobackup of controlfile in RMAN is failing with error:

RMAN-571: ===========================================================

RMAN-569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-571: ===========================================================

RMAN-3009: failure of Control File and SPFILE Autobackup command on

ORA_DISK_1 channel at 10/27/2010 12:13:31

ORA-245: control file backup operation failed

2. In RAC environment, backup controlfile to non shared location fails

SQL> ALTER DATABASE BACKUP CONTROLFILE TO ‘/hhttp://www.oracleplus.netome/rac1122/test/control.bk’ REUSE

ERROR at line 1:

ORA-245: control file backup operation failed

3. In RAC environment backing up standby controlfile to non shared location fails

SQL> alter database create standby controlfile as ‘/home/oracle/renostdbycntrl.ctl’;

alter database create standby controlfile as

‘/home/oracle/renostdbycntrl.ctl’

ERROR at line 1:

ORA-245: control file backup operation failed

4. In RAC environment copy current controlfile to ‘${DB_BACKUP_DIR}/rac_tnctv_control.bak’;

channel ch1: starting datafile copy

copying current control file

RMAN-571: ===========================================================

RMAN-569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-571: ===========================================================

RMAN-3009: failure of backup command on 10/07/2011 11:36:42 channel at ch1

ORA-245: control file backup operation failed

5. In RAC environment, Rman backup fails if snapshot controlfile is not in shared location.

RMAN-00571: ========================================================

RMAN-00569: ============ ERROR MESSAGE STACK FOLLOWS =============

RMAN-00571: =========================================================

RMAN-03009: failure of resync command on default channel at 03/13/2012 10:19:41

ORA-00245: control file backup operation failed

OCCURRENCE

Only affect Real application Cluster (RAC ), 11.2 specific.

SYMPTOMS

In RAC environment any form of controlfile backup may fail with ORA-0245 if the location of the Snapshot Controlfile is not a shared location.

The backup of the controlfile actualy makes a backup of the SNAPSHOT controlfile. The Snapshot controlfile is created when the controlfile is about to be backed up.

The Snapshot controlfile is a read-consistent copy of the controlfile.

WORKAROUND

SOLUTION:

This is a RAC specific ‘configuration’ issue and the correct configuration is as described below

It is changed behaviour which requires that the snapshot controlfile in a RAC environment, is on a shared location.

1. Check the snapshot controlfile location:

RMAN> show snapshot controlfile name;

2. Configure the snapshot controlfile to a shared disk:

RMAN> CONFIGURE SNAPSHOT CONTROLFILE NAME TO ‘/snapcf_.f’;

Or in case of ASM use

RMAN> CONFIGURE SNAPSHOT CONTROLFILE NAME TO ‘+/snapcf_.f’;

PATCHES