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Re: pg_start_backup and pg_stop_backup Re: Re: [COMMITTERS] pgsql: Make CheckRequiredParameterValues() depend upon correct

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Bruce Momjian <bruce(at)momjian(dot)us>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: pg_start_backup and pg_stop_backup Re: Re: [COMMITTERS] pgsql: Make CheckRequiredParameterValues() depend upon correct
Date: 2010-04-30 17:26:46
Message-ID: AANLkTimDvFOc8sHkE_P36wHdynmPmyWtehlr6C0KsfYE@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Fri, Apr 30, 2010 at 12:22 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> Tom Lane wrote:
>> Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
>> > Tom Lane wrote:
>> >> If you aren't archiving then there's no guarantee that you'll still have
>> >> a continuous WAL series starting from the start of the backup.
>>
>> > I wasn't really thinking of this use case, but you could set
>> > wal_keep_segments "high enough".
>>
>> Ah.  Okay, that seems like a workable approach, at least for people with
>> reasonably predictable WAL loads.  We could certainly improve on it
>> later to make it more bulletproof, but it's usable now --- if we relax
>> the error checks.
>>
>> (wal_keep_segments can be changed without restarting, right?)
>
> Should we allow -1 to mean "keep all segments"?

If that's what you want to do, use archive_mode.

...Robert

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