Re: dbsize & pg_dump

From: "mcelroy, tim" <tim(dot)mcelroy(at)bostonstock(dot)com>
To: "'pgsql-admin(at)postgresql(dot)org'" <pgsql-admin(at)postgresql(dot)org>
Subject: Re: dbsize & pg_dump
Date: 2006-04-25 21:06:24
Message-ID: 0C4841B42F87D51195BD00B0D020F5CB044B2586@MORPHEUS
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Please disregard this question. I'm using pg_dump -F c which compresses the
data a it backs it up.

Tim


-----Original Message-----
From: pgsql-admin-owner(at)postgresql(dot)org
[mailto:pgsql-admin-owner(at)postgresql(dot)org]On Behalf Of mcelroy, tim
Sent: Tuesday, April 25, 2006 4:40 PM
To: 'pgsql-admin(at)postgresql(dot)org'
Subject: [ADMIN] dbsize & pg_dump

Good afternoon,
Probably an easy question but why are the file sizes differ so much between
these two tools?
For example:
A backup using pg_dump of our largest DB creates a file 384MB in size
Using the following SQL code utilizing dbsize I get the following:
FIX1=# SELECT D1.pg_size_pretty AS "FIX1_DB_SIZE"
FIX1-# FROM (SELECT pg_size_pretty(database_size('FIX1'))) D1;
FIX1_DB_SIZE
--------------
3832 MB
(1 row)
Is it safe to assume that pg_dump does a compression of the data?
Thanks
Tim

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