Home Page for the TeradataForum
 

Archives of the TeradataForum

Message Posted: Fri, 19 Dec 2003 @ 17:39:49 GMT


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


Subj:   Re: can anyone help me out here
 
From:   Terry Stover

One thing to note, the optimizer is smart enough to use the nusi for values that are selective and skip the nusi for frequently occuring values. R5 has sparse nusi's, which allows you to avoid creating index rows for values where the index won't be useful anyway.

A nusi takes 8+ bytes per row and secondary indexes are A LOT less useful than on Teradata than on other rdbms's. Try collecting stats on a column before you try a nusi.



     
  <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