RE: Archive files and their Management

[Fink, Dan]

Title: Archive files and their Management

The key to the issue is very simple, Redo Logs (including archived) contain information that cannot be recovered by other means (unless you capture EVERY statement issued). As such, they are to be protected at all costs. The vast majority of unrecoverable databases that I have dealt with have not been because of data files or control file problems, but archived redo logs. If you have redo logs, you can recreate database files that are empty and apply all tx to them. If you are missing a log or it cannot be read, your recovery stops at that point. It is possible to open a database with out having recovered all tx, but this is not a production level scenario...it is a 'we have tried everything else and if this doesn't work I'm Flipping Burgers at McDonalds.

 

So, off my soapbox...

 

Uncompressed archive logs are on at least 2 different backup tapes/alternate media

Compressed archive logs are on at least 3 different backup tapes/alternate media

Once an archive log has been backed up 5 times, it can be deleted.

 

Dan Fink

-----Original Message-----
From: Denham Eva [mailto:[EMAIL PROTECTED]]
Sent: Friday, October 18, 2002 4:29 AM
To: Multiple recipients of list ORACLE-L
Subject: Archive files and their Management

Greetings Gurus

Just wondering.......
Our archive log's directory has grown substantially and space is becoming an issue.
How do you know which archive files is safe to delete?
In other words...
Do you delete all archive files older than the last backup?
Should you keep all archive files until it is obviously pointless?

Please advise.
Many thanks
Denham Eva
Oracle DBA
"UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity."
Dennis Ritchie.

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