RE: Indexes vs Logical Files

The physical file does not have keys. Only the LF have keys.

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Gavin Inman
Sent: Friday, October 13, 2023 8:52 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Indexes vs Logical Files

Years ago it was explained to me that if the physical has keys, it's
forced to use the older database engine.  Unless something has changed,
I believe that's still true today.

Gavin.

On 10/13/2023 8:47 AM, Greg Wilburn wrote:

I've been using Index Advisor and Run Sql Scripts "Run and Explain" to analyze some of our queries. I'm looking for increased performance.

I have a large file/table OEBOXCBX with a logical files defined with the following keys:

LF #1: BXCOM#, BXORD#, BXREL#, BXBOX#, BXPRT#
LF #2: BXCOM#, BXORD#, BXREL#, BXBXNO, BXPRT#

I ran an SQL statement over a complex SQL view that contains this file. RSS Run and Explain recommended the following index:
CREATE INDEX ASTHHOBJ/OEBOXCBX_IDX
ON ASTHHOBJ/OEBOXCBX (BXCOM# ASC, BXORD# ASC, BXREL# ASC) UNIT ANY KEEP IN MEMORY NO;

My question is why the SQE wouldn't use one of the existing logical files as an index? As an RPG guy, this makes no sense to me.

TIA,
Greg

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