redo backup

Can any expert explain how to backup redo log files..
nobleitAsked:
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Chakravarthi AyyalaDatabase AdministratorCommented:
i do not backup online redo logs.
but, as you asked the question:
  - if you are performing a cold backup, copy the online redo logs.
  - if you are performing an online backup and database in archive mode, you archive log the current online redo log and take the backup of the archived redo logs.
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slightwv (䄆 Netminder) Commented:
To confirm/add to what ReliableDBA posted, I'll refer you to the online docs.  Just about everything you'll ever need is typically explained in detail in the docs:

http://download.oracle.com/docs/cd/E11882_01/server.112/e10897/backrest.htm#ADMQS09111

Database Backup and Recovery Concepts

Consistent and Inconsistent Backups
A backup is either consistent or inconsistent. To make a consistent backup, your database must have been shut down cleanly and remain closed for the duration of the backup. All committed changes in the online redo log files are written to the data files during the shut down process, so the data files are in a transaction-consistent state. When you restore your data files from a consistent backup, you can open the database immediately.

If the database is in ARCHIVELOG mode, then you can make inconsistent backups that are recoverable using archived redo log files. Open database backups are inconsistent because the online redo log files contain changes not yet applied to the data files. The online redo log files must be archived and then backed up with the data files to ensure recoverability.

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gvsbnarayanaCommented:
to add to the other member's comments, RMAN never takes backup of redo logs, but will only take backup of archived redo logs when asked.
HTH
Regards,
Badri.
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