Problem with pg_dump

Hi!
I´m start to work with postgresql, and I have some problema when I try
to run pg_dump.

If  I execute:

pg_dump mibd -U postgres > midb.out

Don´t receive any error message, but midb.out is empty.... (0 kb)

I can create databases, searchs, imports, etc...

My postgresql´s version is 8.1.2 and the SO  is RHL 4 and the packages
installed (by rpm) were:  postgresql,  postgresqlcontrib,
postgresqlserver, postgresqllibs

I hope, that someone can help me...
Thanks a lot!

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