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IDS Forum

Re: Onbar Backup

Posted By: Jorge
Date: Tuesday, 27 May 2014, at 2:36 p.m.

In Response To: Re: Onbar Backup (Martin Fuerderer)

In the case of using ontape is the same?
I meant If I only do a level 0 backup using ontape every day, and I only need a full restore from the last day, I don't need to backup the logical logs?

Thanks in advance.

Enviado desde mi iPhone

El 27/05/2014, a las 02:37, "Martin Fuerderer" <MARTINFU@de.ibm.com> escribió:

> Hi,
>
> whatever in the end you choose to do, please test it thoroughly,
> not just by doing some backups, but also by restoring them !
>
> [ I still seem to have in mind (after several years), that ON-Bar
> may need logical log content in order to restore certain types
> of backups.
>
> This was/is mainly the case when the ON-Bar backup is not a
> whole system backup, because in this case, each dbspace
> gets backed up with its own, individual archive checkpoint.
> A system restored from such a backup is not consistent after
> the physical restore part, because of the individual archive
> checkpoints of the different dbspaces. In this case, logical log
> records are needed, to make the system logically consistent
> to a single reference point (i.e. archive checkpoint). The
> restore needs to retrieve these logical log records from the
> logical log backups. If logical logs were not backed up, then
> the restore will not be able to make the system logically
> consistent.
>
> The concept of a "whole system backup" was introduced
> relatively late for ON-Bar (whereas it always was and is the
> only mode for ontape). With a whole system backup, there
> is a) only a single archive checkpoint for all dbspaces and
> b) the logical log records needed later during restore to
> synchronize everything to this single archive checkpoint
> are contained within the backup. In this case, no logical
> log backup is needed for a restore.
>
> At least, this is what I recall. :)
> ]
>
> Regards, Martin
> --
> Martin Fuerderer
> IBM Informix Development Munich, Germany
> Information Management
>
> Read about the Informix Warehouse Accelerator:
> http://tinyurl.com/the-iwa-blog
>
> IBM Deutschland Research & Development GmbH
> Chairman of the Supervisory Board: Martina Koederitz
> Board of Management: Dirk Wittkopp
> Corporate Seat: Boeblingen, Germany
> Reg.-Gericht: Amtsgericht Stuttgart, HRB 243294
>
> From: "Art Kagel" <art.kagel@gmail.com>
> To: ids@iiug.org,
> Date: 05/27/2014 01:10
> Subject: Re: Onbar Backup [33104]
> Sent by: ids-bounces@iiug.org
>
> YES! Here's the deal. If you can afford to lose all transactions that
> committed between the archives then you don't need to back up logical
> logs.
> Most sites cannot afford to lose that data.
>
> Art S. Kagel
>
> Disclaimer: Please keep in mind that my own opinions are my own opinions
> and do not reflect on the IIUG or any other organization with which I sm
> associated either explicitely or implicitely not on individuals affiliated
>
> with those organizations.
>
> On May 26, 2014 6:57 PM, "Jorge" <jorgervt@gmail.com> wrote:
>
>> I have configured only an onbar backup level 0 every night. When I will
>> need a restore I will do a level 0 restore.
>> In this case do I need to backup the logical logs or is not necesary?
>>
>> Thanks in advance.
>>
>> Enviado desde mi iPhone
>>
>> El 26/05/2014, a las 14:56, "Jack Parker" <jack.parker4@verizon.net>
>> escribió:
>>
>>> Only if you want to roll forward from the level 0. So logs BEFORE the
> =
>>> level 0 aren=92t much use, but the ones between your backups are.
>>>
>>> j.
>>>
>>> On May 26, 2014, at 5:48 PM, Jorge <jorgervt@gmail.com> wrote:
>>>
>>>> Hi,=20
>>>> =20
>>>> If I always do a level 0 backup using onbar, Do I need to backup the
> =
>>> logical=20
>>>> logs to do a restore?=20
>>>> =20
>>>> Thanks in advance.=20
>>>> =20
>>>> Enviado desde mi iPhone=20
>>>> =20
>>>> =20
>>>> =
> **************************************************************************
> =
>
>>> *****=20
>>>> Forum Note: Use "Reply" to post a response in the discussion
> forum.=20=
>>>
>>>> =20
>
> *******************************************************************************
>
>>> Forum Note: Use "Reply" to post a response in the discussion forum.
>
> *******************************************************************************
>
>> Forum Note: Use "Reply" to post a response in the discussion forum.
>
> --14dae947322ba0451904fa55ad68
>
>
> *******************************************************************************
>
> 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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