RE: Do any of you have a policy on rebuilding indexes?

Since RPG now allows partial keys, it is notlonger useful to have indexes for shorter keys.

RPG allowed always to access the data with a partial key!

Just for your information if you have shorter indexes with the same key fields in the same sequence
... SQL builts 2 indepenent access path which both have to be maintained, i.e. access path is only shared if there are 2 indexes with exactly the same keys in the same order.
... logical files (with the same or less key fields in the same order) can share access paths if the LF with the more key fields are generated first.

Mit freundlichen Grüßen / Best regards

Birgitta Hauser
Modernization – Education – Consulting on IBM i

IBM Champion since 2020

"Shoot for the moon, even if you miss, you'll land among the stars." (Les Brown)
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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Raul Alberto Jager Weiler
Sent: Thursday, 30 March 2023 23:52
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Do any of you have a policy on rebuilding indexes?

Since RPG now allows partial keys, it is notlonger useful to have indexes for shorter keys.

El jue, 30 de mar de 2023, 10:26, Rob Berendt <robertowenberendt@xxxxxxxxx>
escribió:

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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