Re: Behavior of indexes after run a CLRPFM

Hi.

Im working on AS/400. The only tool I know is PRTSQLINF. Anybody knows
another?
It's very strange, the index looks ok, but the optimizer don't uses it. In
this situation, I drop the index and I create it again. After this, the
index is used by the process.
The only clue I have that perhaps causes problems is the CLRPFM that I run
in the beginnig of the process. The CLRPFM cleans the statistics of the
indexes?
Rui


On Thu, Jan 20, 2011 at 2:42 PM, <rob@xxxxxxxxx> wrote:

I think there is an explain tool available in iNav which may help. It may
decide that it was more economical to do a full table scan or some such
thing. For example, if you did a CLRPFM and inserted one row, why bother
with an index?


Rob Berendt
--
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
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http://www.dekko.com





From: Rui <rmfeliz@xxxxxxxxx>
To: midrange-l@xxxxxxxxxxxx
Date: 01/20/2011 09:22 AM
Subject: Behavior of indexes after run a CLRPFM
Sent by: midrange-l-bounces@xxxxxxxxxxxx




Hello.

Sometimes, when I run some SQL operations (like a select), the SQL
Optimizer
does not use the correct index.
Before I load the table, I run a CLRPFM over it.
Can the CLRPFM be responsable for the non-use of the indexes? The RGZPFM
fix it?

Best Regards,

Rui



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