Why can’t you use RMAN to back up Online Redo Log Files

The Oracle database uses the three types of “live” files during its operation:datafiles,control files and online redo log files.Of these files RMAN only backs up the datafiles and the control files.You can’t use RMAN to backup the online redo log files.
If you are operating in No-Archivelog mode,then you won’t need the online redo log files ,since the database files are always consistent when you backup the database using the only permitted modes of backing up a database in No-archivelog mode,which are closed whole backups.
You won’t need the online redo log backups if you are operating in Archivelog mode either ,since RMAN is continually backing up all your archived redo logs.
However you must make sure you always multiplex the online redo log so you won’t lose all the members of a group.


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s