RE: ORA-0214, controlfile updates question

From: Kevin Closson <kevinc_at_polyserve.com>
Date: Wed, 30 Aug 2006 14:15:11 -0700
Message-ID: <5D2570CAFC98974F9B6A759D1C74BAD0E5AE9B@ex2.ms.polyserve.com>

 

so, admins create multiplexed CF because one is good, so more must be better! :-)        

---

	From: Tuomas Pystynen [mailto:tuomas.pystynen_at_deepbase.com] 
	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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Received on Wed Aug 30 2006 - 16:15:11 CDT