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Re: Avoiding unnecessary reads in recovery

From: "Zeugswetter Andreas ADI SD" <ZeugswetterA(at)spardat(dot)at>
To: "Jim Nasby" <decibel(at)decibel(dot)org>,"Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>
Cc: "pgsql-hackers Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Avoiding unnecessary reads in recovery
Date: 2007-04-26 14:10:56
Message-ID: (view raw or whole thread)
Lists: pgsql-hackers
> So what happens if a backend is running with full_page_writes 
> = off, someone edits postgresql.conf to turns it on and 
> forgets to reload/ restart, and then we crash? You'll come up 
> in recovery mode thinking that f_p_w was turned on, when in 
> fact it wasn't.
> ISTM that we need to somehow log what the status of 
> full_page_writes is, if it's going to affect how recovery works.

Optimally recovery should do this when confronted with a full page image
only. The full page is in the same WAL record that first touches a page,
so this should not need to depend on a setting.


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