SQL Access Path Enhancement

(Originally posted 2006-02-22.)

First reported for DB2 Version 7 APAR PK17725 documents an enhancement to the access path for EXISTS (also NOT EXISTS) queries…

Previously DB2 performed DISTINCT processing, requiring a sort. Now the sort can be avoided as DISTINCT processing is no longer done.

Fixes will be made available for Versions 7 and 8.

Published by Martin Packer

I'm a mainframe performance guy and have been for the past 35 years. But I play with lots of other technologies as well. View more posts