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IDS Forum

Re: Restore + Logical log - caution

Posted By: Fernando Nunes
Date: Friday, 20 January 2012, at 6:58 p.m.

In Response To: Re: Restore + Logical log - caution (Cesar Inacio Martins)

Cesar.... sorry.... But what commands did you run?
AFAIK a simple "ontape -r" will restore and will not ask for the tape where
the "old" log is. It will ask you if you have more log tapes...
I'd like to understand how the restore is being done... It was not clear to
me on the PMR, but I confess it is a bit long and I was working on
something while looking into this...
Regards

On Fri, Jan 20, 2012 at 9:59 PM, Cesar Inacio Martins <
cesar_inacio_martins@yahoo.com.br> wrote:

> I will comment/answering the messages of Fernando , Madson and Art...
>
> Fernando, I will try keep simple...
> When you take a Archive Level 0 , as far I know the idea is, all logical
> logs backuped (file/tape) before this archive could be lost and you
> don`t need to worry because all you need is inside of your archive level
> 0 (physical and logical logs).
> But when you restore your database with logs, the engine reclaim for
> logical logs backuped before the archive (the same logical logs what
> already is inside of the same archive level 0). So if you don`t have the
> tape/files of this logical logs you will have a big problem...
>
> Madson, I understand what you said and I agree, but the logical log
> requested by the ontape (during the logical log restore) already is
> available on archive restored (I checked with onstat -l + onlog)... so
> why reclaim for a tape/file what you already have?
>
> Art, on my situation I checked and all logical logs from the "oldest"
> open TX are available when the physical restore finished (checked with
> onstat -l + onlog)... so , what Madson says will works fine. The problem
> is, if you want continue restoring more logical logs backuped after this
> archive, you will need the files/tapes of logical logs backuped since
> the "oldest" TX open (here is the problem) and this logs you already
> have restored and available...
>
> On 01/20/2012 05:28 PM, Fernando Nunes wrote:
> > Cesar: When you say "restore" can you explain the sequence of commands
> you
> > used?
> > Thanks!
> >
> > On Fri, Jan 20, 2012 at 6:50 PM, Fernando Nunes<domusonline@gmail.com
> >wrote:
> >
> >> I will try to check this. Thanks for the APAR. I don't understand it...
> You
> >> can backup the logical log with an open transaction, but it will not be
> >> re-used... As such, it's in the level 0...
> >> Why do you need to provide something that's still in the engine?
> >> I suppose I'm missing something.... If anybody spots what it is,don't
> >> hesitate to clarify... meanwhile I'll take a look at the APAR...
> >>
> >> Regards
> >>
> >> On Fri, Jan 20, 2012 at 12:26 PM, Cesar Inacio Martins<
> >> cesar_inacio_martins@yahoo.com.br> wrote:
> >>
> >>> 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.
> >>>>
> >>>
> >>>
> >>>
> >>
> >
>
> *******************************************************************************
> >>> Forum Note: Use "Reply" to post a response in the discussion forum.
> >>>
> >>>
> >> --
> >> Fernando Nunes
> >> Portugal
> >>
> >> http://informix-technology.blogspot.com
> >> My email works... but I don't check it frequently...
> >>
> >> --00248c769136d0879e04b6fa26b7
> >>
> >>
> >>
> >>
> >
>
> *******************************************************************************
> >> Forum Note: Use "Reply" to post a response in the discussion forum.
> >>
> >>
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Fernando Nunes
Portugal

http://informix-technology.blogspot.com
My email works... but I don't check it frequently...

--20cf303b42d3f92da204b6fe7507

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