Home » RDBMS Server » Backup & Recovery » from which point does recovery start ??
from which point does recovery start ?? [message #186314] Mon, 07 August 2006 07:44 Go to next message
tridentadm
Messages: 142
Registered: March 2006
Senior Member
if instance crashes at a particular point in time, from where does the recovery begin. ?

or how much is exactly recovered ??

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Re: from which point does recovery start ?? [message #186652 is a reply to message #186314] Tue, 08 August 2006 21:43 Go to previous messageGo to next message
ebrian
Messages: 2794
Registered: April 2006
Senior Member
You need to be more specific. There are various forms of crashes and recovery; this may help with any questions you have Backup and Recovery Concepts.

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Re: from which point does recovery start ?? [message #186691 is a reply to message #186652] Wed, 09 August 2006 02:03 Go to previous messageGo to next message
tridentadm
Messages: 142
Registered: March 2006
Senior Member
suppose user is updating a table x with 1 record.
and there is a problem where the instance just crashes.

i haven issued a commit yet.

so will that particular record be recovered ??

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Re: from which point does recovery start ?? [message #186764 is a reply to message #186691] Wed, 09 August 2006 07:14 Go to previous message
ebrian
Messages: 2794
Registered: April 2006
Senior Member
If the true cause of the crash is due to simply the instance failure, then Oracle will automatically recover the changes associated with the transaction. When the instance is restarted, it will roll forward any data that was committed but hasn't been recorded in the datafiles and will then rollback any transactions that were still active at the time of failure.

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