× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



Of course, it is highly recommended that one does not specify an LF in a SELECT (unless occasionally for Select-Omit) - the optimizer will just go out to the PF and see what the indexes are for it, then choose what it thinks best.


On Select-Omit - those are in the class of things called derived-key indexes. I've looked around some on this QAQQINI setting - recent documentation doesn't even include IGNORE_DERIVED_INDEX. The default at first was *NO, then it was changed to *YES at 6.1 of the OS. Maybe these days, this setting is ignored - someone else would need to day. Of course, we now can define indexes to include a WHERE clause - analogous to S/O LFs - how do those work with SQE? This is a sandbox I've not played in.


Cheers
Vern


On Fri, 13 Oct, 2023 at 8:34 AM, Charles Wilt <charles.wilt@xxxxxxxxx<mailto:charles.wilt@xxxxxxxxx>> wrote:


To: midrange systems technical discussion

That has never been the case.

And now-a-days, pretty much everything goes through the SQE.

Originally, if you referenced a LF on an SQL statement, you forced the use
of the CQE.

Perhaps that's what you're thinking of. But again, even that is no longer
the case.


Charles

On Fri, Oct 13, 2023 at 6:52 AM Gavin Inman <midrangelist@xxxxxxxxxxxxxx<mailto:midrangelist@xxxxxxxxxxxxxx>>
wrote:

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

[Logo]<https://www.totalbizfulfillment.com/><https://www.totalbizfulfillment.com></a>> Greg Wilburn
Director of IT
301.895.3792 ext. 1231
301.895.3895 direct
gwilburn@xxxxxxxxxxxxxxxxxxxxxxx<mailto:gwilburn@xxxxxxxxxxxxxxxxxxxxxxx><mailto:gwilburn@xxxxxxxxxxxxxxxxxxxxxxx<mailto:gwilburn@xxxxxxxxxxxxxxxxxxxxxxx>>
1 Corporate Dr
Grantsville, MD 21536
www.totalbizfulfillment.com<http://www.totalbizfulfillment.com><http://www.totalbizfulfillment.com<http://www.totalbizfulfillment.com>>


--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@xxxxxxxxxxxxxxxxxx<mailto:MIDRANGE-L@xxxxxxxxxxxxxxxxxx>
To subscribe, unsubscribe, or change list options,
visit: https://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxxxxxxxx<mailto:MIDRANGE-L-request@xxxxxxxxxxxxxxxxxx>
Before posting, please take a moment to review the archives
at https://archive.midrange.com/midrange-l.

Please contact support@xxxxxxxxxxxxxxxxxxxx<mailto:support@xxxxxxxxxxxxxxxxxxxx> for any subscription related
questions.



As an Amazon Associate we earn from qualifying purchases.

This thread ...

Follow-Ups:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.