Re: Improving SQL Update perfomance -- MIDRANGE-L

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Bill,

Thanks for your answer. That is one of those things that
are really obvious after you are told about them :-)

In a (informal) test running in a old 270 (V5R3) I "shaved"
8 seconds updating a 168,000 records table (1 min. 46 secs
vs 1 min. 54 secs)

Thanks for the tip,

Luis

--- midrange-l-request@xxxxxxxxxxxx wrote:
----------------------------------------------------------------------

message: 1
date: Thu, 29 Nov 2007 11:45:51 -0800
from: "Bill" <brobins3d@xxxxxxxxx>
subject: Re: Improving SQL Update perfomance

Luis Rodriguez wrote:

UPDATE LIBNAME/TABLE SET
Field1 = round(field1 / 1000, 2),
Field2 = round(field2 / 1000, 2),
...
Fieldn = round(fieldn / 1000, 2);

You may get a small improvement by changing to
multiplication

Update libname/table set field1=round(field1 * .001, 2),
. . .

Bill

Luis Rodriguez

IBM Certified Systems Expert
eServer i5 iSeries Technical Solutions

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