Home Page for the TeradataForum
 
https:

Archives of the TeradataForum

Message Posted: Thu, 05 Apr 2012 @ 13:39:23 GMT


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


Subj:   Re: How Hashing algorithm works?
 
From:   Danti Naga Dhana Lakshmi Parupudi

Hello Sughesh,

Input to the Hashing Algorithm is the Primary Index (PI) value of a row.

The output from the algorithm is the Row Hash,a 32-bit binary value.

The first 16 bits of a Row Hash is the Destination Selection Word (DSW).

The DSW points to one entry Hash map(A one-dimensional array that associates DSW values with specific AMPs)

The referenced Hash Map entry identifies the AMP for the row hash.


Thanks,

Dhana Lakshmi



     
  <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: 28 Jun 2020