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Message Posted: Wed, 08 Feb 2006 @ 17:30:39 GMT


     
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Subj:   Optimizer won't use PPI
 
From:   Summers, Scott

Seems there's a known issue with PPI not being used when dates in a BETWEEN are manipulated with date arithmetic or the dates come from another table. Anyone have a way to force the optimizer to use the PPI under these conditions? I don't want to hard code dates in my query.

For a simple example I have some SQL where I create a single row volatile table with a dynamically determined beg_date and end_date which is duplicated on all the amps then product joined to the large table but the PPI is not being used and the full table scan is very expensive.

I hear this won't be fixed till maybe V2R7...any suggestions for the meantime?

These do not use the PPI and do a full table scan:

     select * from really_big_table, my_dates
        WHERE table_date BETWEEN beg_of_month and end_of_month;

     select * from really_big_table
        WHERE table_date BETWEEN date-10 and date;

This does use the PPI:

     select * from really_big_table
        WHERE table_date BETWEEN '2006-01-01' and '2006-01-31';

Table my_date has two columns and one row:

     beg_of_month    end_of_month
     '2006-01-01'  '2006-01-31'

Table really_big_table has 4+ billion rows.



     
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