Re: EMC Timefinder consistent split and Oracle --
- From: sathish balasubramaniam <sat0789@xxxxxxxxx>
- To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 29 Mar 2011 15:21:19 +0400
Agreed....but this is case where because of timefinder split, the clone
copy is equivalent to as if instance has been aborted.
No recovery is required other than reading online redo.
But becaue of sync is ongoing between primary and BCV archive DG, we have
few more archvie logs on the BCV side which are beyond the time when the
split happened.
I understand i don't have to do recover database , but a startup alone will
be enough to do instance recovery -- but that will not apply the new archive
logs.
My question is if i do a startup mount and do a recover database until
cancel, will my new archive logs that got generated after the split be
applied.
If the answer is yes, how does recover process know that there are new
archive logs present that we can apply.
Thanks,
On Tue, Mar 29, 2011 at 3:10 PM, Bobak, Mark <Mark.Bobak@xxxxxxxxxxxx>wrote:
> Seems to me, you are confusing instance recovery and database recovery.
> If instance crashes, and there's mo physical corruption, you'll get
> automatic instance recovery on next startup. If that happens, Oracle will
> automatically roll forward to time of crash, using active and current redo
> log. Archive logs will not be involved.
>
> If you issue 'recover database until...', now you're talking database
> recovery after restore from backup, and archive logs will need to be
> applied.
>
> Sent from my iPhone
>
> On Mar 29, 2011, at 6:55 AM, "sathish balasubramaniam" <sat0789@xxxxxxxxx>
> wrote:
>
> Basically what i am asking is i have had a database abort.
> And in this case a few more archive logs are generated after that due to
> timfinder sync.
> When i mount the database, control file is read and the locations and other
> info are verified.
> Then whe i issue recover database until command.
> I am assuming here that the recover database portion of the script will
> say and only instance recovery is required by looking at stop/start SCN and
> checkpoint SCN.
>
> So how will it know that there are few more new archive logs that need to
> be applied.
> Thanks,
> On Tue, Mar 29, 2011 at 1:05 PM, Kumar Madduri <ksmadduri@xxxxxxxxx>wrote:
>
>> Yes I think so and that should work.
>>
>>
>> On Tue, Mar 29, 2011 at 1:51 AM, sathish balasubramaniam <
>> sat0789@xxxxxxxxx> wrote:
>>
>>> How would i do that...Do i do a startup mount and say recover database
>>> until cancel and start applying archive logs generated between T1 and T2
>>> with or without cataloging in control file ??..Technically there is nothing
>>> to recover isn't it. It is an instance recovery situation.
>>> In that situation can we mount and say recover database until cancel and
>>> apply additional archive logs ??
>>>
>>> Thanks
>>>
>>> On Tue, Mar 29, 2011 at 12:19 PM, Kumar Madduri
>>> <ksmadduri@xxxxxxxxx>wrote:
>>>
>>>> Not sure why you want to catalog the archive logs in the control file.
>>>> It is possible to apply the archive logs between t1 and t2 and open the
>>>> database. If you are using bcv split then you are probably not using rman
>>>> to
>>>> restore and recover. Then I dont think you need to let the control file
>>>> know
>>>> (even with rman) about what archive logs you want to apply.
>>>>
>>>>
>>>> - kumar
>>>>
>>>> On Mon, Mar 28, 2011 at 11:59 PM, sathish balasubramaniam <
>>>> sat0789@xxxxxxxxx> wrote:
>>>>
>>>>> Hello All,
>>>>>
>>>>>
>>>>>
>>>>> I have question with regards to EMC timefinder consistent split and
>>>>> Oracle.
>>>>>
>>>>>
>>>>>
>>>>> I have 2 device groups
>>>>>
>>>>>
>>>>>
>>>>> Data which has datafile, controlfle and online redo log AND
>>>>>
>>>>> Flashback which has flashback and archive.
>>>>>
>>>>>
>>>>>
>>>>> Now I establish and sync up primary and BCV devices, then just before
>>>>> doing a split, I switch the logfile and do an timefinder consistent split
>>>>> only data device group.
>>>>>
>>>>> My flashback device group is still syncing up and accumulating new
>>>>> flashback and archive logs on the BCV side.
>>>>>
>>>>>
>>>>>
>>>>> Now assume that we have 4 new archive logs that has been generated
>>>>> after the split of data DG.
>>>>>
>>>>> Now I do an timefinder consistent split for the flashback DG.
>>>>>
>>>>>
>>>>>
>>>>> Data and redo device groups are of point in time T1 while
>>>>>
>>>>> Archive log and flashback logs are of point of time T2.
>>>>>
>>>>>
>>>>>
>>>>> I mount the BCV volumes and do a startup. At time point oracle will do
>>>>> a crash recovery and bring up the database as of point T1. – That is
>>>>> clear.
>>>>>
>>>>>
>>>>>
>>>>> My aim is to also apply the archive logs generated between T1 and T2.
>>>>>
>>>>> Now assume that instead of doing a startup, I do a startup mount and
>>>>> catalog the new archive logs in the control file and then I do a recover
>>>>> database.
>>>>> My question is will the new archive logs be applied by the recover
>>>>> process and can I bring up the database as of time T2 and open it up with
>>>>> resetlogs.
>>>>>
>>>>> Is this possbile..
>>>>>
>>>>> Appriciate your help in this regard...
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Sat
>>>>>
>>>>
>>>>
>>>
>>
>
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