wal archive peak during pg_dump

From: Willy-Bas Loos <willybas(at)gmail(dot)com>
To: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: wal archive peak during pg_dump
Date: 2014-01-09 10:42:42
Message-ID: CAHnozTh7cLteg4RCmW_tpWroTVBmym5DdrA5H1P1KQNwbEFS9g@mail.gmail.com
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Hi,

I've set up hot standby slaves for a couple of clusters.
The wal is cleaned up after use, i don't use it as a backup (yet).
It seems that the amount of wal peaks shortly after midnight, when pg_dump
is running.

It doesn't seem logical to me that pg_dump should generate wal, but i
haven't been able to find a different explanation so far.
So to make sure, i want to ask you people: can it be that running pg_dump
creates a lot of wal?

Cheers,

WBL

--
"Quality comes from focus and clarity of purpose" -- Mark Shuttleworth

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