Re: Taking Backup from standby database

  • From: Mladen Gogala <gogala.mladen@xxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Fri, 2 Dec 2016 02:41:23 -0500

On 12/02/2016 01:09 AM, Vadim Keylis wrote:

Good evening oracle experts. I am having issue activating database restored using backup taken from standby.
Our current setup: We have one primary and one standby database. The standby database is kept in sync with primary using dataguard. We are currently taking backups from primary. We are want to move backups from primary to standby database.


I used script bellow to take backup from standby database and then restored backup on different server. The database was successfully restored and physical standby. The problem started when I try activating it. I got the following error
    ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '+STAGEDATA/SETLR/DATAFILE/system.5096.929468439'



I will greatly appreciate suggestions on taking backups from standby in order to restore as primary in case of emergency as well as how to solve inconsistency error after standby database is activated.

Thanks so much,
Vadim


-------------------------Script to backup from physical standby -------------------------------------------------
run
{
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/mnt/db_transfer/SETL/rman_backup/ctl/control_%F';
CONFIGURE MAXSETSIZE TO 128 G;
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/mnt/db_transfer/SETL/rman_backup/ctl/snapcf_SETL.f';
ALLOCATE CHANNEL ch1 DEVICE TYPE DISK FORMAT '/mnt/db_transfer/SETL/rman_backup/db_%d_df_t%t_s%s_p%p_level0';
BACKUP INCREMENTAL LEVEL 0 TAG LEVEL_0_20161201_1526 DATABASE ;
DELETE FORCE NOPROMPT OBSOLETE;
RELEASE CHANNEL ch1;
}



Vadim, in addition to what Don has said, I don't see "RESYNC CATALOG" in your script, which probably means that you are not using catalog. If you are taking a backup from the standby DB, you MUST use a catalog. The explanation is very simple: without catalog, the standby database records the information about the backup into its control file. That control file is separate from the primary control file, which means that the primary knows nothing about the backup taken on standby. The only shared place where both databases can look for backup is rman catalog.
The use of rman catalog is required for any type of a proxy backup, like the backup from a storage snapshot or a backup using standby. The rman catalog used DBID as the primary key, so it will recognize both the primary database and a standby as the same database and will be able to restore the primary from a backup taken on the standby.
Oh yes, as Don has said, you really, really want to include archive logs in the backup.


--
Mladen Gogala
Oracle DBA
Tel: (347) 321-1217

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