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From: Yeb Havinga <[email protected]>
To: Kevin Grittner <[email protected]>
Cc: [email protected]
Cc: Greg Stark <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: Bruce Momjian <[email protected]>
Cc: Michael Tharp <[email protected]>
Cc: [email protected]
Cc: Craig Ringer <[email protected]>
Subject: Re: no universally correct setting for fsync
Date: Tue, 11 May 2010 10:00:21 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Kevin Grittner wrote:
> "Joshua D. Drake" <[email protected]> wrote:
>  
>   
>> The answer to this is:
>>
>> PostgreSQL.org recommends that this setting be left on at all
>> times.  Turning it off, may lead to data corruption.
>>
>> Anything else is circumstantial and based on knowledge and facts
>> we don't have about environmental factors. 
>>     
>  
> Perhaps Josh's language for fsync could be modified to work here
> (we're now talking about full_page_writes, for anyone who's lost
> track):
>  
> | it is only advisable to turn off fsync if you can easily recreate
> | your entire database from external data.
>  
> That covers bulk loads to an empty or just-backed-up database and
> entirely redundant databases.  Saying it should never be turned off
> would tend to make one wonder why we have the setting at all.
>   
Would the term "entirely redundant databases" include (synchronously) 
replicated databases? (ps: I did indeed lose track about whether this is 
about fsync or full_page_writes and did not get on the track again)

regards,
Yeb Havinga

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