Following up on this, part of my confusion on this was that we were hitting a
bug with 11g dbs but it was fixed by 12c, related to archivelogs getting
repeatedly backed up after passing their recovery window goal. Working with
our outsourcing team we've come up with backups using:
backup incremental level 1 cumulative device type sbt filesperset = 1 section
size 64G database plus archivelog not backed up filesperset = 8 delete all
input;
... and a separte archivelog cleanup job using:
DELETE NOPROMPT ARCHIVELOG ALL BACKED UP 1 TIMES TO DEVICE TYPE 'SBT_TAPE'
COMPLETED BEFORE 'SYSDATE-2';
Regards,
Dave
From: Herring, Dave
Sent: Friday, August 21, 2020 4:48 PM
To: 'oracle-l@xxxxxxxxxxxxx' <oracle-l@xxxxxxxxxxxxx>
Subject: Archivelog deletion w/ ZDLRA
For those of you who are using ZDLRAs and have RTRT (real-time redo transport)
configured, how are you identifying archivelogs that are OK to delete (on the
protected-database side, not the RA, obviously)?
Every log switch creates an archivelog in ASM (disk) and another sent to the RA
(sbt). Actually, the RA copy is considered a backup based on output from "list
backup of archivelog all;". I can view the disk copies using "list copy of
archivelog all;". All good so far.
But, the disk copies aren't expired. I've set:
RMAN> CONFIGURE ARCHIVELOG DELETION POLICY TO BACKED UP 1 TIMES TO DEVICE TYPE
SBT_TAPE;
RMAN> CROSSCHECK ARCHIVELOG ALL;
RMAN> LIST ARCHIVELOG EXPIRED;
... and get no rows. I also tried "CONFIGURE ARCHIVELOG ... APPLIED TO ALL
STANDBY;" but still no rows expired. The archivelogs might be obsolete, but
Oracle RMAN documentation for the DELETE command states "... The
DELETE...OBSOLETE command cannot be used when backups are stored to Zero Data
Loss Recovery Appliance, commonly known as Recovery Appliance."
If "DELETE EXPIRED ARCHIVELOG" doesn't return any rows and I can't use "DELETE
...OBSOLETE", what version of "DELETE" should be used? Do most people do
something like "DELETE ...UNTIL SYSDATE-1" and hope that RMAN would raise an "
RMAN-08137: warning: archived log not deleted, needed for standby or upstream
capture process" if an archive gets selected but hadn't made it to the RA for
some reason?
I guess I'm having trust issues.
Regards,
Dave
