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Message Posted: Fri, 02 Jul 2004 @ 13:04:51 GMT

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Subj:   Re: Duplication followed by Merge Join
From:   David Clough

Thanks for your comments Martin and Sanjaya.

I now see the telling line in the Explain :

We do an all-AMPs RETRIEVE step from PRODCOE_T.CONENTRY by way of an all-rows scan with a condition of ("PRODCOE_T.CONENTRY.COU_ID_ACC = 'NL '") into Spool 4 (all_amps), which is built locally on the AMPs.

Then we do a SORT to order Spool 4 by row hash.

The result spool file will not be cached in memory. The size of Spool 4 is estimated with high confidence to be 22,574,687 rows.

Dave Clough
Database Designer
Database Design Group

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