×
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.
No - the term DERIVED INDEX means a select./omit - I suggest doing a
google search on the term below and find all you can - I think the
explanations are clear and worth looking.
This value controls whether the optimizer will be the new query engine
or the old one, when there are select/omit logicals against the physical
file you are querying.
Remember, you should almost never use a logical file in you SELECT
statement. Although it forces you to the old query engine, it is OK to
use a select/omit in your SELECT if you want to take advantage of its
selectivity. It is probably less confusing, however, to put that
selectivity into a WHERE clause, so that it is explicitly stated, and
use the based-on PF. Hey, SQL just might use the S/O logical!!
Regards
Vern
David FOXWELL wrote:
-----Message d'origine-----
[mailto:midrange-l-bounces@xxxxxxxxxxxx] De la part de Elvis Budimlic
- even when querying PFs, mere existence of an S/O LF may
cause a query to be routed to CQE. That is, unless there is
an IGNORE_DERIVED_INDEX setting in QUSRSYS/QAQQINI set to
*YES, or you're on V6R1 (that's the default setting for that
version of the OS), or your S/O LF is defined with the DYNSLT keyword
I'm not sure if I understand that : does IGNORE_DERIVED_INDEX stop the use of all indexes if I just reference the PF in the SQL instruction?
As an Amazon Associate we earn from qualifying purchases.
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.