How long should we keep logs archived in the comic book?

11.2.0.4 DB Oracle Linux 6.5

We have a database whose archive generation is as follows.

Average of generation of archive log: 400 GB/day

Max log generation: 900 GB/day

Archive log diskgroup size: 4 TB

Backup strategy: we take full backups on Monday and Wednesday and Level1 for the rest of the days.

-----------------

Sunday-> level 0 backup

Monday-> level 1 backup

Tuesday-> level 1 backup

Wednesday-> level 0 backup

Thursday-> level 1 backup

Friday-> level 1 backup

Saturday-> level 1 backup

Both Level0 and Level1 scripts have MORE ARCHIVELOG; (without a clause to DELETE all THE ENTRIES )

We have archiveLog backup script that runs at 10:00 and 16:00 which does not REMOVE all ENTRIES either.

We serve the archivelogs of Level0 and Level1 backup scripts, with the following command

delete noprompt archivelog until 'SYSDATE -2";

Question1. What is the industry standard to keep (retention period), archiving within DB logs? Is there a 'formula' / rule for this? When a restore, recovery lose us not a lot of time restore backup media archivelogs. That's why we stay 2 days now archivelog within the DB.

Question2. We have 4 TB of space to store the archivelogs in this particular PB. With 900 GB Max generation arch daily newspapers, we can keep safe the last 3 days of the archivelogs. Right? I mean, is there a possibility of hitting the terrible archiver error if we increase the shelf life of the archive logs using the delete noprompt archivelog until 'SYSDATE -3';

N ° DELETE OBSOLETE removes old newspapers also all the log_archive_dest.


I could be wrong, but this is the first I hear of this and on a quick scan, I found no support in that either rman reference or guide the user to rman.  Could cite your source?

DELETE OBSOLETE is not the same thing as REMOVE EXPIRES.

-EDIT

Never mind.  I found it.

DELETE

OBSOLETE Removes backups of data files and copies stored in the repository RMAN which are obsolete, in other words, is no longer required (see example 2-66). RMAN also deletes the log of the obsolete filesand archived redo log backups.

RMAN determines what backups and copies of data files are no longer needed, which in turn determines what records (and backups of logs) are no longer needed. RMAN considers that the creation of a data file as a backup to decide which connects to keep.

Post edited by: EdStevens

Historically, I saved my archivelogs with the option to DELETE the ENTRIES, I never had reason to notice or question this behavior... a rman DELETE OBSOLETE reach out to the archivelogs themselves.   Thinking maybe it was related to the maintenance of the FRA, I just tried a little test in two ways... archivlogs wrote to FRA and archivelogs writes destined for non - FRA.  Of course, anyway DELETE OBSOLETE also deleted real archivelogs.  I don't know that I'll change my procedures as well, but it is good to know.

I learned something new today.  Can I go home now?

Tags: Database

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