RE: Index advisor advising index on primary key -- MIDRANGE-L

Well it wouldn't hurt anything <grin>

But I don't know for sure....

Maybe somebody who does will explain it, or as Vern suggest call IBM.

If you do call IBM, let us know what they say!

Charles Wilt
Software Engineer
CINTAS Corporation - IT 92B
513.701.1307

wiltc@xxxxxxxxxx

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
bounces@xxxxxxxxxxxx] On Behalf Of Jeff Crosby
Sent: Friday, April 11, 2008 9:04 AM
To: Midrange Systems Technical Discussion
Subject: Re: Index advisor advising index on primary key

So even though it's the primary key, I should *still* create an index
using the primary key?

Wilt, Charles wrote:

Actually, now that I think about it....and do a little

googling....<grin>

A DDL defined table with a PK is implemented as a *FILE object with an

embedded access path, just like

a DDS defined keyed physical.

So perhaps the same scenario applies, the SQL index has some extra

statistical information that the

query engine can use.

HTH,

Charles Wilt
Software Engineer
CINTAS Corporation - IT 92B
513.701.1307

wiltc@xxxxxxxxxx

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
bounces@xxxxxxxxxxxx] On Behalf Of Wilt, Charles
Sent: Friday, April 11, 2008 8:38 AM
To: Midrange Systems Technical Discussion
Subject: RE: Index advisor advising index on primary key

Jeff,

IIRC, this will sometimes happen with a DDS defined file because an SQL
index has more statistical
information that the query engine can use.

But you say your file is a DDL defined table....so I don't know....

Is the suggested index the exact primary key? How many fields in the

PK?

Charles Wilt
Software Engineer
CINTAS Corporation - IT 92B
513.701.1307

wiltc@xxxxxxxxxx

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
bounces@xxxxxxxxxxxx] On Behalf Of Jeff Crosby
Sent: Friday, April 11, 2008 8:30 AM
To: Midrange Systems Technical Discussion
Subject: Index advisor advising index on primary key

At our LUG meeting earlier this week a fellow midranger (Thanks Rob!)
gave a presentation on things you might not have known about on the i.
One of them was iNav index advisor, which I did not know about.

I cleaned out the advice since much of it was old so it would start

fresh.

On our item master file, it is advising that I create an index on

field

ITNBR. This file is an SQL table created via DDL (not DDS) and ITNBR

is

the primary key. Does this advice make sense? Why would it advise an
index on the primary key?

Thanks.

--
Jeff Crosby
UniPro Foodservice/Dilgard
260-422-7531
Opinions expressed are my own and not necessarily those of my company.
Unless I say so.

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in correcting this error is appreciated.

--
Jeff Crosby
UniPro Foodservice/Dilgard
260-422-7531
Opinions expressed are my own and not necessarily those of my company.
Unless I say so.

--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
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