Checking a size of a given database

I have been given a task to try a proof of concept of migrating are active databases from PostgreSQL 8.0.1 to 8.2.3

I will install and configPostgreSQL on my local w/s and replicate the database users etc etc.

I have had a look inside /var/lib/pgsql/data/base and there are numerous  files (db's) which I believe is where I can
checkdata base size. 

1  108012  114465  122407  1261267  1261963  17229  17233  17234  17235  174066  19247  205009  21272  2793694  2794334
333245  333375 

I am aware that Postgresql creates directories to keep each database in.
These directories aren't names,they are kept as the *'OID's *of each
database (oid's are*"object identifiers"*).

Previously I just run pg_dump and thus run ls -lh on the db dump. Anyway
of checking a  size of a given database I have tried
the sql using select pg_database_size ('dbaname'); but no joy.

Cheers
Chuck

--
Chuck Amadi
ROK Corporation Limited
Ty ROK,
Dyffryn Business Park,
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