IBM does not recommend it, but does allow it, i.e. let the SQE execute queries where a DDS described logical file is specified.

Mit freundlichen Grüßen / Best regards

Birgitta Hauser

"Shoot for the moon, even if you miss, you'll land among the stars." (Les Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them and keeping them!"

-----Ursprüngliche Nachricht-----
Von: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von Charles Wilt
Gesendet: Friday, 04.9 2015 15:29
An: Midrange Systems Technical Discussion
Betreff: Re: SQL sort

On Fri, Sep 4, 2015 at 1:06 AM, Birgitta Hauser <Hauser@xxxxxxxxxxxxxxx>
wrote:

Specifying a DDS described logical file in a SQL statement is not a
good idea (and never was).


Actually, IBM does recommend it now...
http://www.mcpressonline.com/tips-&-techniques/sql/techtip-boost-sql-performance-on-dds-databases.html




There is a nice whitepaper about indexing and statitisc strategies
written by Kent Milligan and Mike Cain, which should be learned "by heart".
Here is the link:

https://www-304.ibm.com/partnerworld/wps/servlet/ContentHandler/stg_as
t_sys_
wp_db2_i_indexing_methods_strategies


​That's a great white paper, but it hasn't been updated since 2011..

It appears IBM has move the information into Infocenter and kept it updated..

https://www-01.ibm.com/support/knowledgecenter/ssw_ibm_i_72/rzajq/rzajqprint.htm

Charles
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