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Dump size bigger than pgdata size?

From: "Nicola Mauri" <Nicola(dot)Mauri(at)saga(dot)it>
To: pgsql-admin(at)postgresql(dot)org
Subject: Dump size bigger than pgdata size?
Date: 2006-06-21 14:30:17
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
[sorry if this was previously asked: list searches seem to be down]

I'm using pg_dump to take a full backup of my database using a compressed 
     $  pg_dump  -Fc  my_db > /backup/my_db.dmp

It produces a 6 GB file whereas the pgdata uses only 5 GB of disk space:
     $ ls -l /backup
     -rw-r--r--     6592715242   my_db.dmp
     $ du -b /data
     5372269196   /data

How could it be?
As far as I know, dumps should be smaller than filesystem datafile since 
they do not store indexes, etc. 

Database contains about one-hundred-thousands binary images, some of which 
may be already compressed. So i tried the --compress=0 option but this 
produces a dump that does not fit on my disk (more than 11 GB).
I'm using postgres 8.1.2 on RHEL4.

So, what can I do to diagnose the problem?
Thanks in advance,



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