Re: Is it possible to recover just one datafile/tablespace "until cancel"?

In <3f7a5a50$0$13656$afc38c87_at_news.optusnet.com.au> "Howard J. Rogers" <howardjr2000_at_yahoo.com.au> writes:

>Burt Peltier wrote:

>> If all you lost were archived redo logs, you should not have had to do
>> much , I think.
>>
>> Not sure what you did first, but the correct course of action might have
>> been real simple. Of course, once you do 1 wrong command, the correct
>> command may no longer work. Good reason to do a cold backup before doing
>> any recovery.
>>
>> I once had a database crash in the middle of a hot backup. It looked like
>> I needed to do some kind of recover.
>>
>> But, I think (been a while - doing this from poor memory) all I had to do
>> was 'recover database' . Basically, because the datafiles were in "begin
>> backup" mode, Oracle needed the current REDO log just to "sync" things up
>> and take the datafiles out of backup mode.
>>

>This disaster just continues to run and run, doesn't it?

>No, Burt. You didn't need to do 'recover database' at all (and if you'd just
>lost your archive logs, it wouldn't have worked in any case). All you need
>to do if you crash in the middle of a hot backup is 'alter database
>datafile x end backup'. That causes the headers of the files to be
>re-synchronised, and therefore an 'alter database open' would have worked.
>Of course there might be more than one file in hot backup mode, so a quick
>check of v$backup before doing anything is always in order.

>The tragedy of Stan's predicament is that this is *not* what he did, but
>proceeded instead to muck about with incomplete recoveries on some files,
>and not on others, followed by Lord knows what else. And as you so wisely
>put it, once you've embarked upon a failed recovery, the correct recovery
>procedures are unlikely to work when they are (eventually) tried. The
>suggestion of a cold backup before starting any recovery is an excellent
>one -though often not practical in a production 24x7 environment :-(

>And that's the particular boat Stan is now in, with offlined datafiles that
>cannot possibly be recovered, and no chance of doing an incomplete
>recovery. Data has been lost, and the situation is unrecoverable.

Thanks for the nice summary here.

-- 
"They that would give up essential liberty for temporary safety deserve
neither liberty nor safety."
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