don't think so. here an extract from man pages
To dump a database:
$ pg_dump mydb > db.out
To reload this database:
$ psql -d database -f db.out
bye
matthias
-----Original Message-----
From: Christopher Kings-Lynne [mailto:chriskl@familyhealth.com.au]
Sent: Wed 6/15/2005 5:48 PM
To: operationsengineer1@yahoo.com
Cc: pgsql-php@postgresql.org
Subject: Re: [PHP] pg_dump
Only problem is you need to stop PostgreSQL from running to do it...
operationsengineer1@yahoo.com wrote:
> i read that you can copy the contents of pgsql's data
> directory to create a backup, too. in order to
> restore the db, you clean out the data directory and
> then copy the "backed up" files back in to the data
> directory.
>
> i have no experience using this method, but i thought
> i'd mention it to see if anyone else has done this.
>
> --- Christopher Kings-Lynne
> <chriskl@familyhealth.com.au> wrote:
>
>
>>pg_dumpall <dbname> > backup.sql
>>
>>Chris
>>
>>enzo venegas palacios wrote:
>>
>>>hi, i don't know use the pg_dump instruccion and i
>>
>>need create a backup,
>>
>>>please someone has an example.
>>>thanks
>>>enzo
>>>
>>
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match