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  3. May 2006

Re: Stored Procedures vs. SQL Statements vs. CHAIN

Hi Brian
This strikes me as another "it depends". If you can do multiple updates with a single SQL statement, it is probably faster. You mention CHAINs, so you must have some useful indexes (LFs) over the data that SQL could take advantage of. It's hard to know where the break-even point is - generally SQL is for multiple-row, mass changes. Native IO is still ideal for one-at-a-time, for the most part. But a good set of indexes can swing it either way.
Another consideration is ease of maintenance - not a daily performance issue, however.
You can find IBM's stuff on SQL any of the recent Infocenters - www.iseries.ibm.com/infocenter - pick the V5R4 version, eg., click on the "Database" link, find the "Related information" link, and there you find the relevant Redbooks, among other things. One of them is entitled "Stored Procedures, Triggers and User Defined Functions on DB2 Universal Database for iSeries" - link is 

http://www.redbooks.ibm.com/abstracts/sg246503.html
You can also find stuff at www.iseries.ibm.com/db2 - there under the support tab are code samples, tech articles, etc. That link is on the same "Related information" page, as well as lots of other good stuff. Even a link to porting to iSeries from other systems - it's the link near the bottom with "enable" in it, I think. 

HTH
Vern

At 07:17 AM 5/5/2006, you wrote:


Hi All,



Can someone tell me in terms of speed which method would be best when
working with multiple records?  Right now my code uses a series of SQL
statements to update several hundred records in one shot.  I'm thinking
about moving these statements to a stored procedure instead, but I
wanted to weigh my choices against a good old CHAIN command as well.



Anyone have any thoughts or comments?



Also, can someone please recommend a good Redbook that discusses Stored
Procedures on the i5?



Thanks!



Brian.



-=-=-=-=-=-=-=-=-=-=-=-=-=-

Brian Piotrowski

Specialist - I.T.

Simcoe Parts Service, Inc.

PH: 705-435-7814

FX: 705-435-6746

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