Home Page for the TeradataForum
 

Archives of the TeradataForum

Message Posted: Wed, 06 Mar 2002 @ 11:53:14 GMT


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


Subj:   Re: What information does 'collect statistics' store?
 
From:   David Wellman

The result of the COLLECT STATISTICS command is a number of 'buckets' (I think @100) of information. For each 'bucket' the information stored is maximum value, mode value (i.e. most frequently occurring), how many rows contain this mode frequency, number of distinct non- modal values and number of rows which contain a non-modal value. This information all comes from 3Q 2001 Teradata Magazine.

As much as it 'would be nice' to store the number of rows for each value that is not practical where you have potentially millions of distinct values for a column.


Cheers,

Dave

Ward Analytics Ltd: Information in motion (www.ward-analytics.com)



     
  <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