From: Jerry Sievers <gsievers19@comcast.net>
To: Stephen Frost <sfrost@snowman.net>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Ray Stell <stellr@vt.edu>
Cc: pgsql-admin\@postgresql.org <pgsql-admin@postgresql.org>
Subject: Re: 9.4 pg_dump use on 9.0 db
Date: Tue, 13 Jan 2015 12:06:16 -0600
Message-ID: <86a91m5zdz.fsf@jerry.enova.com> (raw)
In-Reply-To: <20150113153610.GR3062@tamriel.snowman.net>
References: <54B52E9B.8020208@vt.edu>
<11235.1421162639@sss.pgh.pa.us>
<20150113153445.GQ3062@tamriel.snowman.net>
<20150113153610.GR3062@tamriel.snowman.net>
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Stephen Frost <sfrost@snowman.net> writes:
> * Stephen Frost (sfrost@snowman.net) wrote:
>
>> Looking at pg_dump, for my 2c anyway, it'd be nicer if we threw an error
>> on parallel dump request when the major version doesn't support
>> synchronized snapshots, unless the user explicitly passed
>> --no-synchronized-snapshots, indicating that they don't care.
>
> Ah, bah, we do that already. Good on us. I was looking at where the
> snapshot is actually taken and didn't notice the earlier check.
The OP didn't mention if the DB is huge and/or inconvenient to quiesce.
But in any case, doing a --jobs N dump from a per-snapshot origin system
requuires the system be quiescent just long enough to get the pg_dump
master process and all workers connected.
I assume this is due to pg_dump running all of its N workers each using
a persistent connection and in a serialized transaction.
Thus --jobs --no-sync-snap is very slick indeedy!!
FYI
>
> Nevermind me.
>
> Thanks,
>
> Stephen
--
Jerry Sievers
Postgres DBA/Development Consulting
e: postgres.consulting@comcast.net
p: 312.241.7800
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To: pgsql-admin@postgresql.org
Cc: gsievers19@comcast.net, sfrost@snowman.net, tgl@sss.pgh.pa.us, stellr@vt.edu
Subject: Re: 9.4 pg_dump use on 9.0 db
In-Reply-To: <86a91m5zdz.fsf@jerry.enova.com>
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