Home Page for the TeradataForum
 

Archives of the TeradataForum

Message Posted: Mon, 02 Nov 2015 @ 20:13:56 GMT


     
  <Prev Next>   <<First <Prev Next> Last>>  


Subj:   Re: Multiple single-column SI vs Single Multi-column SI
 
From:   Myrna, James

When the optimizer knows only some of the USI columns, then it must perform an *All AMP*, full scan of the secondary index, which in many cases is better than scanning the entire base table.


Jim



     
  <Prev Next>   <<First <Prev Next> Last>>  
 
 
 
 
 
 
 
 
  
  Top Home Privacy Feedback  
 
 
Copyright for the TeradataForum (TDATA-L), Manta BlueSky    
Copyright 2016 - All Rights Reserved    
Last Modified: 15 Jun 2023