• Subject: Re: Commitment Control
  • From: ywexler@xxxxxxx
  • Date: Tue, 14 Jul 1998 11:04:51 +0300

John,
May be the programmer arguing against CC is a good programmer (and I'm
not sure about), but certainly he does not understand the OLTP
environment.
You already decided to use journals and I advise to use the "BOTH"
option (2 images).
CC is the best and fast way to ensure transaction integrity. The other
way to do so causes a much graeter overhead, but some consevative
programmers cuntinue to use it. It was used during the early release of
CPF (S/38 OS).
The 2 images journal helps you not only to achieve a better restore in
case of disk crash but also to go back (remove changes) in case a bug is
caused data damages und you must clean your files and reinsert the
changes.
the 2 major points against journaling and CC are a, the performance
overhead and b, the disk space used by the receivers.
My experience (we use journals since S/38) shows the overhead is very
minor, and now the hardware is very cheap, and the receivers can be
detached, saved and deleted some times during the day and is very easy
to write automatic/scheduled procedures.
My opinion is based on my experience as the DP manager of an AS/400 site
serving about 1,200 interactive users in about 170 remote brances.

Joseph Wechsler  


John Hall wrote:
> 
> We are in the midst of doing some conversions to old software.  One of
> the programmer/consultants we brought in is arguing against setting up
> commitment control.  I feel that it is a feature we should be using.
> 
> He feels that there may be too much overhead on the system.  We are
> going to enable journaling on all these files anyway.
> 
> We are on a Model 170 2164.  We just moved from an F10 so we can afford
> some overhead in processing time.
> 
> What is the general feeling on this ?  If we are posting a batch of 500
> records should we commit on every record, every 10th record or after the
> entire batch ?
> 
> I think it may be a case of lack of knowlege on his part but I would
> like some other opinions.
> 
> John L. Hall
> Home Sales Co.
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