Re: [ROOT] how compression is done in ROOT branch

From: Rene Brun (Rene.Brun@cern.ch)
Date: Wed Nov 27 2002 - 16:04:55 MET 

Hi HP,

On Wed, 27 Nov 2002, HP Wei wrote:

> hi,  
>    I am trying to understand how the compression in 
>    a ROOT branch is done.
>    Block by block ? And there is no relation between
>    blocks ???
>    
Compression is block by block, no relations between blocks

>    In particular, suppose I have a branch with
>    billions of entries.
>    will there be time difference between the time
>    for accessing, say, 1000 entries 
>    in the beginning of the branch
>    and near the end of the branch ?
>   
  Should be the same time in a first approximation.

Rene Brun

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