Archives Gone Wild! Or: what is a mandatory archive destination?

We had a situation where our DBs were configured with log_archive_dest_1 set to a destination of local file system, and log_archive_dest_2 has been set to a standby dataguard. dest_2 has been delayed and the broker turned off due to some work of DR site.

Everything was humming... until due to a miscommunication gross/misunderstanding, a DBA has added log_archive_dest_3, which has been specified like this:

ALTER SYSTEM SET log_archive_dest_3 = ' LOCATION = / nas/database_name "SCOPE = BOTH;

log_archive_dest_state_3 has already been fixed and the DB immediately began trying to archive in/nas/DBNAME, who was on the NAS. We have never designed for it, and worse still, similar orders were given in other databases on the same server that are all very busy. We have four production servers busy trying to archives on the NAS. Very quickly (30-45 minutes), archiving could not follow, again filled and databases stopped accepting transactions. I have no solid evidence (yet) that the NAS performance caused the problem, but certainly we have the sequence of events where each DB seized 30 to 45 minutes after the change of dest_3 was made (and he exhausted his recovery online).

The DBs include three 10.1.0.4 a 10.2.0.4 9.2.0.8 and another on another server that had the same problem.

In the post-mortem analysis, a question is asked. If things were defined as I mentioned, why was not considered dest_3 as OPTIONAL? What I saw in the papers a lot of contention inter-archiver with a single ARCn process on hold for another. Each DB has 10 archivers. log_archive_min_succeed_dest is set to 1 on all databases. I don't think that even dest_1 is MANDATORY, although I guess min_succeed could ensure.

So here are my questions:

(1) IF you say log_archive_min_succeed_dest = 1 and have two local destinations (not DataGuard), does oracle pick dest_1 that must succeed? Or should I say "as long as the two succeed?

(2) I have a theory that each ARC began trying to write on the NAS and got a bottleneck. I see that they began to "create...". "but I saw no message 'done '. Therefore, the DB has failed to ARCs. What sounds plausible? I know that I would need a few data network / NAS who really make a strong case.

(3) the default value is OPTIONAL for destinations, right? So why the DB would wait on the NAS? Or is the case he had simply run out of ARCs?

Because you have multiple (too?) Archivers, each Redo Log was taken over by an other archiver and each archiver chose not to take DEST_3 as the target to copy to.

It is more likely that with less archiveurs, DEST_1 would have been picked up. For example, with 2 archivers, if ARC1 chose to write SEQ 15363 to DEST_3, ARC2 could choose to write SEQ. 15364 DEST_1
(but then again, you might say ' what needs to prevent ARC2 also choose to write to DEST_3 and blocked on this issue? ")

Hemant K Collette

Tags: Database

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WOW 8.0.6.
Maybe you can run a cross?

change archivelog than any overlap;

Update
Found some docs online for 8.0
http://download.Oracle.com/docs/CD/A58617_01/server.804/a58396/TOC.htm
She does not mention the overlap.
With the change command, you should be able to do the cleaning as well.
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Kind regards
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