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No Vern, no problems or situations that I'm hiding. I'm just doing my homework before attempting to convince others that this method is a viable solution to our re-org window issues.

Part of that issue, however, is that the 3rd-party re-org tool from our HA provider that we have been using fails to successfully accommodate SQL views and such...they never get re-created. They are dis-continuing the product and we are faced with using IBM's RGZPFM or trying to avoid it by invoking REUSEDLT(*YES).

So far, the biggest concerns that are being voiced is performance considerations. My biggest worry are the unknown impacts of RRN processing in the applications...but this can be dealt with via code.

Steve Needles


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Vern Hamberg
Sent: Tuesday, September 10, 2013 1:03 PM
To: Midrange Systems Technical Discussion
Subject: Re: REUSEDLT(*NO) vs. REUSEDLT(*YES)

I see no problems with this - seems to me, that you could end up with a smaller file - only active records, for the most part, no wasted space for deleted records.

Just curious, do you have something in mind that might cause problems?

Vern

----- Original Message -----
What about re-using deleted record space with a file that is setup as *NOMAX.


On Tue, Sep 10, 2013 at 1:33 PM, Needles,Stephen J < SNEEDLES@xxxxxxxxxxxxxxxx> wrote:

We are having an internal debate to reuse deleted records or not. The
most recent info I can find on the subject dates back to V5R4, we are
on V7R1.

Here are a few of the issues that I am aware of REUSEDLT(*YES) will...


- Cause arrival sequence processing to require attention.


- SQL cursors without an ORDER BY will give data in seemingly
random order according to the SQE's implementation of the request
(don't ask how we were bit by this :))


- May cause problems concerning access path maintenance, thus
potentially impacting performance (as of V5R4, this did not appear to
be an issue any longer?).


- Modernizing the DB to DDL (from DDS) will result in tables that
are REUSEDLT(*YES) by default as the CREATE TABLE SQL does not have
provision for restricting deleted row reuse.


- Does not completely exclude the need for periodic RGZPFM to be
run on the tables.

The question is... with enhancements to the SQE in V7R1 and
such...will
REUSEDLT(*YES) provide a significant lessening of the need for RGZPFM
(perhaps annually or monthly versus weekly on select tables) without a
performance problem over time?

Steve Needles

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