Internal fragmentations statistics Was: VACUUM FULL memory requirements

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Is there a command/tool that will report on how FULL a table is getting?
If there is, how intrusive is it? How computationally heavy is it?

We have a database that is approx 100 million rows with
approx 2 million insert/updates per day. Each day old data
is purged from the database. The end result is a mostly static
footprint with regards to disk space used, but I would like to
know how much room is usable inside the tables as well as the
OS file system (that part is easy).

--
Evan Rempel

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