R: Any ideas???

It looks like this:

C/EXEC SQL
C+ declare C2 cursor for
C+ select XXXXX00F.*, tasaas*10000+tasmgs
C+ from XXXXX00F where tasnrs >= :parnrs and
C+ tastsp <> :partsp and
C+ tasaas*10000+tasmgs between :p75ds1 and :p75ds2
C+ union
C+ select XXXXX10F.*, tasaas*10000+tasmgs
C+ from XXXXX10F where tasnrs >= :parnrs and
C+ tastsp <> :partsp and
C+ tasaas*10000+tasmgs between :p75ds1 and :p75ds2
C+ union
C+ select XXXXXP0F.*, tasaas*10000+tasmgs
C+ from XXXXXP0F where tasnrs >= :parnrs and
C+ tastsp <> :partsp and
C+ tasaas*10000+tasmgs between :p75ds1 and :p75ds2
C+ order by tasaas, taslnp, tasnrs
C+ for fetch only
C/END-EXEC

XXXXX00F =>  3.500.000 records
XXXXX10F => 24.000.000 records
XXXXXP0F => 35.000.000 records

p75ds* are date in format 20020101


Any ideas???



Fabrizio Gurrieri - BARTOLINI SPA
Via E.Mattei  42 - 40138 BOLOGNA (Italy)
Tel:+39 051 6015593 - Fax:+39 051 530365
E-Mail: Fabrizio.Gurrieri@bartolini.it
Internet: http://www.bartolini.it



-----Messaggio originale-----
Da: Wills, Mike N. (TC) [mailto:MNWills@taylorcorp.com]
Inviato: mercoledì 26 giugno 2002 16.52
A: 'rpg400-l@midrange.com'
Oggetto: RE: Any ideas???


What does your statement look like?

-----Original Message-----
From: Gurrieri Fabrizio [mailto:fabrizio.gurrieri@bartolini.it]
Sent: Wednesday, June 26, 2002 1:51 AM
To: rpg400-l@midrange.com
Subject: Any ideas???


This is a multi-part message in MIME format.
--
[ Picked text/plain from multipart/alternative ]
Hi,
   I have 3 big files with the same record format, they are divided by date
=> the first are the most recent records, the second the old records and the
third the historical records (totally are 63 milion of records). Now I have
to run SQL (into an SQLRPGLE) on all of these three files order by date and
other three fields with some selection and I've the problem below:
when I run SQL for a period that is completely included in the first file
the SQL (it works using UNION) read all three files and naturally it works
for for too much hours.
How can I optimize my SQL statement, any ideas???

Thanks a lot


Fabrizio Gurrieri - BARTOLINI SPA
Via E.Mattei  42 - 40138 BOLOGNA (Italy)
Tel:+39 051 6015593 - Fax:+39 051 530365
E-Mail: Fabrizio.Gurrieri@bartolini.it
Internet: http://www.bartolini.it <http://www.bartolini.it/>


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