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RMAN Noarchivelog Mode Tips

Expert Oracle Database Tips by Donald BurlesonMarch 25, 2015

RMAN - Backing up a Database Running in Noarchivelog Mode

Although Oracle strongly recommends running the production database in archivelog mode, there will likely be some circumstances where the database needs to be run in noarchivelog mode.  The obvious case is that when running the data warehouse system, archived redo logs should not have to be created for each of the running batch jobs.  By running the database in noarchivelog mode, we automatically refuse any recover process because we will not have any archived redo logs to apply to the restored datafiles. 

The only option will be reverting the database to the last full backup and with that, all changes made after the full backup will be lost.  This type of backup is called cold backup.  If archived redo log filesbeing generated is not desired and the data to the database that was changed after the last full backup can be easily loaded, then running the noarchivelog database may be an option. 

To create a cold backup of the database running in noarchivelog mode using RMAN, the database should be mounted but not opened.  If the database is backed up in the open state, the following error will appear:

RMAN> backup database;
<....... output trimmed .......>
<....... output trimmed .......>
RMAN-00571: ===========================================================
RMAN-00569: =============== error message stack follows ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ORA_DISK_1 channel at
03/09/2010 02:01:14
ORA-19602: cannot backup or copy active file in noarchivelog mode

The following script shuts down the database and start it in mount mode, and then creates a backup of the database:

RMAN> run
2> {
3> shutdown immediate
4> startup mount
5> backup database;
6> }

 

M Please note that Oracle does not recommend running the          database in noarchivelog mode!

 

 

 
 
 
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