RE: Improve SQLRPGLE performance -- RPG400-L

Peter,

Try this.  The first is a physical file with a timestamp field and the second 
is a logical with a date field defined and used as the key.  The gotcha is that 
the date value in the logical must be defined as input only.

     A          R TIMESTMP                   
     A            NOTE          12S 0        
     A            DATETIME        Z          


     A          R TIMESTMP                  PFILE(TIMESTMP)  
     A            DATETIME        L  I                       
      *                                                      
     A          K DATETIME                                   

HTH,

Rick
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Peter Colpaert
Sent: Wednesday, August 04, 2004 8:38 AM
To: RPG programming on the AS400 / iSeries
Subject: RE: Improve SQLRPGLE performance


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



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04/08/2004 14:45
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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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The information contained in this communication is confidential and may be 
legally privileged. It is intended solely for the use of the individual or the 
entity to whom it is addressed and others authorised to receive it. If you have 
received it by mistake, please let the sender know by e-mail reply and delete 
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the information contained in this communication nor for any delay in its 
receipt.    
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