Any ideas???

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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/>