RE: ORA-0214, controlfile updates question
- From: "Kevin Closson" <kevinc@xxxxxxxxxxxxx>
- To: "ORACLE-L" <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 30 Aug 2006 14:15:11 -0700
so, admins create multiplexed CF because one is good, so more must
be better! :-)
________________________________
From: Tuomas Pystynen [mailto:tuomas.pystynen@xxxxxxxxxxxx]
Sent: Wednesday, August 30, 2006 1:34 PM
To: Kevin Closson
Cc: OakTable List
Subject: Re: ORA-0214, controlfile updates question
I agree. After a crash there is no recovery before controlfiles
are opened (and ORA-214 is signalled). Oracle can not write atomically
to multiple controlfiles.
Some important controlfile updates (such as add datafile) are
logged to redo. But it doesn't help here. The redo can not be applied
before controlfiles are opened (redo log names are there). I believe
redo is applied to controlfiles only during media recovery when using
backup controlfile.
Tuomas
Kevin Closson wrote:
>>>Due bugs that show them in extreme circumstances -
why not?
(I have to admit though that I haven't
seen any corruption
cases yet where the cause would have
been determined as lost
writes and nothing else).
I'm not saying it it impossible, I'm saying that in this
case it is MUCH more likely that Oracle's "transaction"
areound this type of multiplexing is a bit questionable.
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