RE: Improve SQLRPGLE performance -- RPG400-L

Mark,

OK, that gave me a VIEW, but the system still needs an access path, which
a view doesn't provide.  Running the program in debug after creation of
the view, still gives the same result: Access path built from keyed file
RFLOGX1 (which doesn't even have the timestamp field in its keys).

Thanks anyway.

Peter



mwalter@xxxxxxxxxxxxxxx
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04/08/2004 15:44
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RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>


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RE: Improve SQLRPGLE performance







CREATE VIEW myView AS SELECT DATE(myTimeStamp) as myDate, otherfields FROM
myPF

Thanks,

Mark

Mark D. Walter
Senior Programmer/Analyst
CCX, Inc.
mwalter@xxxxxxxxxx
http://www.ccxinc.com



                      "Peter Colpaert"
                      <Peter.Colpaert@ho        To:       RPG programming
on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>
                      nda-eu.com>               cc:
                      Sent by:                  Subject:  RE: Improve
SQLRPGLE performance
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                      08/04/2004 09:38
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                      the AS400 /
                      iSeries






Rick,

OK, I'll bite your bait.

How do you create a field in an LF that's the date portion of a timestamp
field in the PF?  I had already thought of that also, but I couldn't find
any keyword to do that.  And simply doing a RENAME() with datatype 'L' is
not allowed.

And you were right about iSeries Nav: it gave me the exact same info as
debug.

Thanks,

Peter



<Rick.Chevalier@xxxxxxxxxxxxxxx>
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RE: Improve SQLRPGLE performance






Peter,

You might try a DDS logical with the date portion of the timestamp defined
as a separate field.

Another option is to use the SQL analyzer in Ops Navigator to analyze your
statement.  If you have used debug I don't think this will give any
different information.

Rick

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Peter Colpaert
Sent: Wednesday, August 04, 2004 3:05 AM
To: RPG400-L@xxxxxxxxxxxx
Subject: Improve SQLRPGLE performance


Hi group,

I made an inquiry SQLRPGLE program where I have to do a count of records
in a file, whereby one of the group-by fields is the date portion of a
timestamp field.  The data is presented in a panelgroup application.

The performance, when running in production over a 600.000-record file, is

very VERY bad.

When I debug the program, it says that arrival sequence is used to build
the access path.

Is there a way to improve the performance, such as by creating an index
that has only the date portion of the timestamp field?

Thanks in advance.

Peter Colpaert
iSeries Application Developer

Honda Europe NV
Langerbruggestraat 104
B-9000 GENT
Belgium
Peter.Colpaert@xxxxxxxxxxxx
Tel: +32 9 2501 334
Fax: +32 9 2501 231
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