Skip site navigation (1) Skip section navigation (2)

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

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(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: 2010-04-28 18:21:53
Message-ID: 3998.1272478913@sss.pgh.pa.us (view raw, whole thread or download thread mbox)
Thread:
Lists: pgsql-hackers
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?)

> Not a configuration I would recommend
> for high availability, but should be fine for setting up a streaming
> replication standby for testing etc. If we don't allow
> pg_start/stop_backup() with archive_mode=off and max_wal_senders>0,
> there's no way to bootstrap a streaming replication standby without
> archiving.

Right.  +1 for weakening the tests, then.  Is there any use in looking
at wal_keep_segments as part of this test?

			regards, tom lane

In response to

Responses

pgsql-hackers by date

Next:From: Robert HaasDate: 2010-04-28 18:21:57
Subject: Re: Add column if not exists (CINE)
Previous:From: Kevin GrittnerDate: 2010-04-28 18:21:49
Subject: explicit (void *) casts

Privacy Policy | About PostgreSQL
Copyright © 1996-2018 The PostgreSQL Global Development Group