× 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.


  1.  Home
  2. RPG400-L
  3. April 2011

Re: SQL Optimizer Not Using Access Path

Kent wrote:

I wrote an interactive RPG program using embedded SQL to retrieve
records from a rather large file (3 million records). It was performing
poorly and I noticed that there wasn't an access path that matched how I
was ordering the records. I created the access path and the performance
was still poor. I started debug and when I look at the debug messages
in the job log, the optimizer decided not to use the access path because
the cost to use this path was higher then creating a path on the fly. I
don't understand this. The access path keys match the order by fields.

I think an access path matching the record selection of your WHERE clause
would be more likely to get the performace you are looking for.

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.