diskspace bigger after a vacuum

Hi,

I have a question, I wnat to use a postgresql database in a embedded
appliance, and thus want to keep the database as small as possible.
I'd noticed that de diskspace only grows when i do an VACUUM; or a
./vacuumdb. Can this be explained why this is? or why this can be?

i use postgresql 7.4.2 and run on fedora core 1.

greetz,
Vincent

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