Home Page for the TeradataForum
 

Archives of the TeradataForum

Message Posted: Fri, 17 Aug 2001 @ 14:47:04 GMT


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


Subj:   Integer vs Character PI
 
From:   Claybourne Barrineau

All,

I created 5 duplicate copies of a table with a single column primary index defined as an integer. When I join these tables together on their common primary index, the optimizer treats everything as an ample local process (no redistributions.)

Then, I created 5 duplicate copies of a table with a single column primary index defined as a CHAR. When I join these tables together on their common primary index, the optimizer redistributes the data after every merge join.

Can someone explain this to me?

I have collected stats on all tables. The optimizer didn't care whether the CHAR primary index was case specific or not.

I can send you all of the table ddl, dml, and explains if you would like it.


Thanks,

Claybourne Barrineau



     
  <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: 27 Dec 2016