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IDS Forum

Re: Restore + Logical log - caution

Posted By: Cesar Inacio Martins
Date: Friday, 20 January 2012, at 7:26 a.m.

In Response To: RE: Restore + Logical log - caution (Dan Mueller)

Hi Dan,

Well... this is just the facts.
The support was reproduced this behave and this is the final answer what
I received.

Particularity , I agree with you. For me this is wrong but I don't have
time and patience any more to discuss with support, so I just request a
correction over the documentation what is easily to do.

On my situation I can workaround just keeping better documented and
instructing better the support team on the company where I work to keep
the logical log tapes safe...

the APAR created: IC80912
HTTP://PUBLIB.BOULDER.IBM.COM/INFOCENTER/IDSHELP/V115/INDEX.JSP?TOPIC=%2FCOM.IBM.BAR.DOC%2FIDS_BAR_479.HTM
NEEDS TO BE UPDATED
According to this document we recommend gathering logical-log tapes from
the backup after the latest level-0 backup but there are certain
scenarios where we need logical-log tapes before the level-0 backup. At
the time of the archive checkpoint, if there was an open transaction
that started in a logical log, ontape asks for the logical log prior to
the archive ckpt for the logical log roll forward.

Project IDS-11.50.xC10

Regards
Cesar

On 20/1/2012 10:05, Dan Mueller wrote:
> Excuse any misunderstanding on my part however... Isn't expected behavior such
> that the actual archive process will back up any logs that it needs to be able
> to restore as of the archive checkpoint taken at the beginning of the archive?
> I do not believe what you are explaining is expected behavior at all and would
> escalate that PMR to the next level. I just do not believe what you were told
> and would love to know where this went from here as I am sure others would
> also.
>
> Thanx,
> Dan
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Cesar
> Inacio Martins
> Sent: Friday, January 20, 2012 6:54 AM
> To: ids@iiug.org
> Subject: Restore + Logical log - caution [25984]
>
> The last weeks I discovery a behave of the engine what is something new for
> me.
> I believe others will be surprised too...
>
> IFX 11.50 FC9
>
> When you restore an archive with logical logs , maybe you needed the
> files/tapes of logical logs backuped before the Archive Level 0.
>
> The reason is open transactions.
>
> I have a situation here where for some reason a session keep they transaction
> opened up to 4 hours (probably a application failure over the control of the
> transaction). When was executed the Archive Level 0 this sessions was idle
> (with TX open) from 3 hour before.
> The "lag" between the logical log what this TX was opened and Archive are take
> is at least 100 Logical Logs (30 MB each = 3GB of Logs).
>
> So, during the restore the engine request all logical logs since this open TX.
>
> The engine include this logical logs on the archive and show the number of
> this logs when the Archive Level 0 is finished, anyway you still needed the
> tapes/files created before this archive to restore the logical backuped after
> this archive.
>
> e.g. when the the archive bellow start running, the current log is
> 129634 , the log 129537 was backuped 5 hours early. If I try restore this
> Archive with logical logs, the engine will request the files/tapes since log
> 129537.
>
> Please enter the level of archive to be performed (0, 1, or 2) 0
>
> Please mount tape 1 on /dev/rmt0 and press Return to continue ...
>
> 10 percent done.
>
> 20 percent done.
>
> 30 percent done.
>
> 40 percent done.
>
> 50 percent done.
>
> 60 percent done.
>
> 70 percent done.
>
> 80 percent done.
>
> 100 percent done.
>
> Read/Write End Of Medium enabled: blocks = 307955
>
> Please label this tape as number 1 in the arc tape sequence.
>
> This tape contains the following logical logs:
>
> 129537 - 129634
>
> Program over.
>
> A PMR was opened over this behave and answered as expected behave. Was created
> a APAR over the documentation (this behave wasn't documented before).
>
> So, if you have any policy of discarding logical logs backups take before your
> Archive... beware .
>
> Regards
> Cesar
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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