Re: Any ideas???

["Denis Robitaille" <denis_robitaille@xxxxxxxxxxxx>]

You could try the following: Extract the earliest and latest date from
each file. Then, analyze the dates in your request and if they fall
within one file, build your SQL request acordingly.

>>> fabrizio.gurrieri@bartolini.it 06/26/02 02:51am >>>
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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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