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Message Posted: Tue, 02 Mar 2004 @ 20:17:31 GMT


     
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Subj:   Re: Calculating the Efficiency Of compression
 
From:   Victor Sokovin

On Tue, 2 Mar 2004 10:48:32 -0800, Rick Davis wrote:

  What is this "table header bytes used by compressed column " , where can I get this info ? , is this same as column length  


  2) row_header_space = table_cardinality * (presence_octets -1)  


  how to calculate "presence octets" ? where can I get this info ?  



These concepts are described in "Database Design", doc ID=B035-1094-083A (November 2003). You should find examples there as well.


Regards,

Victor



     
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