Re: [ EXTERNAL ] Re: Do any of you have a policy on rebuilding indexes?

May I suggest an alternative, or, rather, a middle course? Tell them you
did rebuild them, and then ask if things are running faster. Oftentimes
perception trumps reality.

On the other hand, they are the client. I assume they are paying the
bill.

I've gone both ways in the last 50+ years.

Jerry C. Adams
IBM i Programmer/Analyst
The greatest lesson in life is to know that even fools are right
sometimes. -Winston Churchill
--
NMM&D
615-585-2175


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf
Of Jim Oberholtzer
Sent: Thursday, March 30, 2023 9:48 AM
To: Midrange Systems Technical Discussion
Subject: Re: [ EXTERNAL ] Re: Do any of you have a policy on rebuilding
indexes?

Additionally: does the application reuse deleted records? Are there many
deleted records that are no longer needed if they are not reused?

I agree with Rob, just wholesale rebuilding of the indexes may not be the
wiser choice. I doubt it will hurt anything but then again that's quite a
bit of work to do with no perceived benefit.

As Ken and Rob both point out a bit of detective work is needed before too
much is done. It's likely that a simple reorg of the files in question
would fix the issue. That may require a quieced system (meaning no
applications running) so it might not be tolerable.

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On Thu, Mar 30, 2023 at 9:33 AM Ken Meade <kmeade@xxxxxxxxxxxxxxxxx>
wrote:

This raised a question for me. How could you investigation your indices
to determine last use, number of records affected, etc across all your
files.
Perhaps indices are no longer required and could be deleted and would

that

improve performance?

Ken
----- Original Message -----
From: "Rob Berendt" <robertowenberendt@xxxxxxxxx>
To: "Midrange Systems Technical Discussion" <

midrange-l@xxxxxxxxxxxxxxxxxx

Sent: Thursday, March 30, 2023 10:25:16 AM
Subject: [ EXTERNAL ] Re: Do any of you have a policy on rebuilding
indexes?

Basically, if they're going to just shotgun blast an index rebuild they

may

end up shooting themselves in the foot.

On Thu, Mar 30, 2023 at 10:22 AM Rob Berendt <

robertowenberendt@xxxxxxxxx>

wrote:

In general I do not see the benefit. However it may make a difference

in

the order the indexes were built. For example, which is the proper

order

to build these two indexes?
order, line, receipts (handles partials)
order, line
or
order, line
order, line, receipts


On Thu, Mar 30, 2023 at 8:48 AM Mark Murphy <jmarkmurphy@xxxxxxxxx>

wrote:

We have a client who wants to rebuild indexes, just because they

haven't

been built for a long time (3-4 years). They think it will improve
performance. I've never rebuilt indexes to improve performance. Does
anyone
have an opinion on this?
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