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Message Posted: Thu, 04 Dec 2003 @ 11:55:52 GMT


     
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Subj:   Re: Primary Index
 
From:   Claybourne Barrineau

Denis,

Assuming the Optimizer considers Table 2 (with the 3 part UPI) too large to duplicate to all AMPs, then the Optimizer will have to redistribute Table 1 (with 15 part UPI) to all AMPs inorder to perform an AMP local merge on the 3 part UPI.

If the Optimizer does duplicate Table 2 to all AMPs, then it will leave Table1 in place and perform a merge or memory hash join (depending on the size of Table 2 and your Hash Join settings) on the 3 part UPI of Table 2.


Hope this helps,

Clay



     
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