Re: An idle thought

On Thu, 2010-03-18 at 14:29 +0530, Gokulakannan Somasundaram wrote:

>         If you want it to be cheaply updatable (or even cheaply
>         readable),
>         compression is not what you're going to do.
>         
>                                regards, tom lane
>         
>         
>         
> +1.. 

The visibility map itself is already an example of compression. If
visibility information were randomly distributed among tuples, the
visibility map would be nearly useless.

Regards,Jeff Davis