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Questions on pg_dump

From: "Chris Hoover" <revoohc(at)gmail(dot)com>
To: "pgsql-admin(at)postgresql(dot)org Admin" <pgsql-admin(at)postgresql(dot)org>
Subject: Questions on pg_dump
Date: 2008-07-18 17:05:03
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
We are doing some additional testing of our backup strategy with the goal of
moving from the text dump to the custom format and have some questions about
pg_dump -Fc.

Question 1.  Why would the custom format be larger?  pg_dump -Fc -Z 0 this
morning was 88GB while the normal pg_dump last night was 82GB.  We have not
had that much growth in the few intervening hours.  We were expecting the
-Fc to be at the most the same size of the text dump, and really expecting
the -Fc to be smaller.  Any explanations?  (We are doing timing with various
levels of compression and with the use of external compression to see what
gives us the best compression/time, so that is why the -Z 0 test.)

Question 2.  With the -Fc, how can we verify a successful backup?  With the
normal pg_dump, we are examining the end of the file looking for:
-- PostgreSQL database dump complete

Is there any sort of token like that with the -Fc that can be used to verify
a successful backup?



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