Why keep the Archivelogs after Archivelog backups?

Greetings. I'm a long time SQL Server DBA operating on the dark side.

So we are taking (AL) Archivelog backups every 30 minutes. However, it seems that it is not "empty" the former AL the way in which SQL Server would be "empty" when it backs up the transaction log. They still exist, consume space of course.

The excerpt below shows me that it is not necessary for the latter to retain once they are saved. Of course this would free up space, but I guess there is a good reason not to want to delete them as well? My belief is that a restoration can occur faster with them still existing locally, but hoped someone could confirm / deny here? If this isn't the case, otherwise why would we want to keep them once they are saved?

Thank you!

http://docs.Oracle.com/CD/B19306_01/backup.102/b14192/bkup003.htm

4.3.7.1.2 using BACKUP ARCHIVELOG with ENTRY REMOVE or REMOVE all THE ENTRIES

You can specify the DELETE INPUT or DELETE ALL INPUT clauses for the BACKUP ARCHIVELOG command to delete the log files archived once they are saved, eliminating the separate step of manually delete the archived redo logs.

> I guess that there is a good reason not to want to delete them as well

No, not really. you do not raise a point that if you had to do a restore/recovery operation, it would be faster if they are already there, but this should be a rare operation?

You may want to delete all saved archivelog 2 times (or 3 or 4, etc.) where your backup is bad - this way you ensure that you have several copies autour.

Tags: Database

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