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8.2

How can I delete archived redo logs not needed to flash back to a guaranteed restore point?

Asked by cholman in Oracle 10.x

Tags: oracle 10g, flashback database, delete redo logs

In a test environment, we set guaranteed restore points at various points in an update process, so we can flash the database back to a selected state and re-test a portion of the code.  I had two restore points established, both created with the 'guarantee flashback database' option.

 We are short on disk space on this particular test server, and I needed to clean up the old, unneeded redo logs.  I selected the 'current_scn' from v$restore_point, and used RMAN to 'delete archivelog until SCN', and gave it an SCN a little earlier than the earliest 'current_SCN' from v$restore_point.  

We had flashed back to the second restore point point several times.  Each time, I dropped and re-created that restore point so subsequent flashbacks would go quicker.  (Necessary?  I have no idea.  I'm still learning how all this works.)  

Finally we wanted to start again from the top, so I issued the command to flash back to the first restore point.  It failed due to a missing redo log.  I checked the archived redo logs, and there are tons out there older than the timestamp I was trying to flash back to.  That's odd, and I still don't understand it.

Here's my question:  How can I reliably determine which redo logs are needed to support a guaranteed restore point, and which ones I can safely remove?

One thing that may be important here:  We have the archive log destination configured separate from the db_recovery_file_dest.  I won't muddy the waters with why, although I'm happy to go into it if it will help answer my question.

Thanks for your help -

[+][-]09/07/09 05:15 AM, ID: 25274484Accepted Solution

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Zone: Oracle 10.x
Tags: oracle 10g, flashback database, delete redo logs
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Solution Provided By: cholman
Participating Experts: 1
Solution Grade: A
 
[+][-]09/03/09 11:07 PM, ID: 25257114Assisted Solution

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[+][-]09/04/09 03:42 AM, ID: 25258205Author Comment

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[+][-]09/04/09 10:00 AM, ID: 25261421Expert Comment

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[+][-]09/04/09 10:17 AM, ID: 25261596Author Comment

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