×
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.
Are all tables referenced in your statement the actual PF objects? Does
the needed index for FILEB use select/omit logic? Does Visual Explain
say it's using SQE or CQE?
-Eric
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
franz400@xxxxxxxxxxxx
Sent: Monday, August 30, 2010 1:33 PM
To: midrange-l@xxxxxxxxxxxx
Subject: sql join performance issue
Reviewing a performance issue, .net app opening a cursor that has sql
selects that are inserted into a temp table. Two large orders files
(FILEA & FILEB) and a temp file (FILEC) with the single record of the
Cust and Region selected.
FILEA inner join FILEB on aORDER = bORDER inner join FILEC on aCUST =
cCUST,aREGION = cREGION
Visual Explain is saying FILEB is a table scan even though it has an
index of ORDER (there is 1 rec per order in "a" and also "b").
Not understanding why it needed a table scan of a million recs to get 80
records for a cust/region
Jim Franz
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.
midrange.com
