× 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.



That's true too!

Clare

----- Original Message -----
From: <Jderham2@xxxxxx>
To: <midrange-l@xxxxxxxxxxxx>
Sent: Thursday, March 25, 2004 9:42 AM
Subject: Re: Query optimizer tells me to build an access path that
alreadyexists


> In a message dated 3/25/2004 3:54:46 AM Eastern Standard Time,
> Clare.Holtham@xxxxxxxxxxxxxx writes:
> > That's one of the indexes you ALWAYS want to build. The Optimizer may
well
> > use it for statistics (data skew). Or it may want to use an index from
index
> > access method or whatever.
> > Or do you mean you have already created the index? That can happen too.
When
> > the optimizer looks for an index, it may use different criteria or time
out
> > before it gets to the right one. These rules are different depending
which
> > version of the OS/400 you have. Sometimes it searches fifo, sometimes
the
> > other way, etc.
> > If the file is really huge you could also try creating an EVA index.
> > If you are on V5R2 there are now two different SQL Optimizers with
different
> > rules, and a new statistics gatherer.
> > If you're in the US, I believe IBM do workshops on this subject....
> >
> > cheers,
> >
> > Clare
> >
> > Clare Holtham
> > Director, Small Blue Ltd - Archiving for BPCS
> > Web: www.smallblue.co.uk
> > IBM Certified AS/400 Systems Professional
> Rumor has it that if you create the index with SQL rather then with DDS
that
> the SQL will like it more better.
> Jack D.
>
> _______________________________________________
> This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
list
> To post a message email: MIDRANGE-L@xxxxxxxxxxxx
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/midrange-l
> or email: MIDRANGE-L-request@xxxxxxxxxxxx
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/midrange-l.
>



As an Amazon Associate we earn from qualifying purchases.

This thread ...

Replies:

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.