RE: APYJRNCHG

["Bale, Dan" <D.Bale@xxxxxxxxxxxxx>]

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Do incremental SAVCHGOBJ's complicate the deleted objects issue I raised
yesterday?  Try out this scenario:

Sunday night:  Full backup (SAVLIB ...)
Monday:        Delete FILE123
Monday night: SAVCHGOBJ
Tuesday:       Create FILE123
Tuesday night:  SAVCHGOBJ
Wednesday:  Some sort of disaster requiring total restore.

After restoring Monday night's SAVCHGOBJ, we determined yesterday that
FILE123 would still be on the system, even though it was deleted on
Monday.  When we restore Tuesday night's SAVCHGOBJ, will the restore
balk at restoring an object that it shows having a creation date after
the one found on the system (restored from the Sunday night backup)?
How about other object attributes?  A change in the record format?

Another scenario...  Logical files.  If you were restoring a bunch of
incremental backups, would you have the option to specify that (and I'd
guess this would only apply if you used the default ACCPTH(*NO) on your
saves) access paths not be rebuilt for all but the last restore?  It
seems almost mandatory that if your recovery plan includes restoring
from incremental backups, you'd better be saving your access paths.

Learning a lot from this thread!

Dan Bale
IT - AS/400
Handleman Company
248-362-4400  Ext. 4952
D.Bale@Handleman.com

> -----Original Message-----
> From: R. Bruce Hoffman, Jr. [SMTP:rbruceh@attglobal.net]
> Sent: Thursday, August 23, 2001 9:32 AM
> To:   midrange-l@midrange.com
> Subject:      Re: APYJRNCHG
>
>
> -----Original Message-----
> From: oliver.wenzel@cibavision.novartis.com
> <oliver.wenzel@cibavision.novartis.com>
> To: midrange-l@midrange.com <midrange-l@midrange.com>
> Date: Thursday, August 23, 2001 4:08 AM
> Subject: AW: APYJRNCHG
>
>
> ---snip---
> re savchgobj: I'll have a full backup on sunday and daily savchg. If I
> loose
> the system on saturday I'll need 6 different
> tapes to do the reload, right? What happens if one of the daily tapes
> is
> damaged? As Murphy says, it sure will be the
> monday tape...
>
> ---snip---
>
> This is a common misconception. The answer is "it depends". Once an
> object
> goes changed it remains changed, so long as the save change object
> uses the
> same reference date.
>
> In that case, where you are not creating and deleting files and
> members, no,
> you only need the full and the latest save changed object tapes.
>
> Under a product like BRMS, or your own program, you can specify that
> you
> want incremental changes which then substitutes the last changes save
> date
> and time on the reference of the save changed object command.
>
> In this case, yes, you need them all for restore.
>
> The trade off is much shorter windows for each save against a more
> complicated restore. The questions are: which one will you be doing
> most
> often (save or restore) and how much of a save window do you have, how
> much
> lead time on recovery do you have and how long do you have to recover?
>
> ===========================================================
> R. Bruce Hoffman, Jr.