7.2 -> 7.3 => data version/dump problem

Hello,

I just made a mistake of upgrading from
7.2(.1 or .2) to 7.3.1, forgetting that some
data format has changed.
When I tried starting postmaster I now get:

[root(at)linux2 pgsql]#
/etc/rc.d/init.d/postgresql start

An old version of the database format was
found.\nYou need to upgrade the data format
before using PostgreSQL.\nSee (Your System's
documentation
directory)/postgresql-7.3/README.rpm-dist
for more information.

The file mentioned does exist, but does not
mention how to deal with the data format change.
I found some references online that mention
that one needs to dump the database and then
reimport it.
So I tried using pg_dump to do that, but
that seems to require that the server be
running:

[root(at)linux2 pgsql]# pg_dump MyDB
pg_dump: [archiver (db)] connection to
database "MyDB" failed: could not connect to
server: No such file or directory
Is the server running locally and
accepting
connections on Unix domain socket
"/tmp/.s.PGSQL.5432"?

'MyDB' is correct (that is, I used the real
DB name in place of MyDB).

Looks like a circular dependency to me.
Can anyone help me with this. Searching
this list is impossible - searches take over
a minute.
I am using Red Hat 8.0.

Thanks,
Otis

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