From: Joe Conway <mail@joeconway.com>
To: Andrew Gierth <andrew@tao11.riddles.org.uk>
To: S. Bob <sbob@quadratum-braccas.com>
Cc: pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: Unique cluster / instance identifier?
Date: Mon, 18 Feb 2019 13:40:02 -0500
Message-ID: <da5904c4-cbe2-fb02-3a5d-42d8f18a057d@joeconway.com> (raw)
In-Reply-To: <87r2c5htm3.fsf@news-spur.riddles.org.uk>
References: <92d53982-cf1d-ce3f-c541-60a252f85aef@quadratum-braccas.com>
<87r2c5htm3.fsf@news-spur.riddles.org.uk>
On 2/18/19 1:03 PM, Andrew Gierth wrote:
>>>>>> "S" == S Bob <sbob@quadratum-braccas.com> writes:
>
> S> Hi all;
>
> S> Does PostgreSQL store a unique cluster or instance identifier that
> S> we can access to identify our instances?
>
> Yes. But it's not easy to get at: it's the "Database system identifier"
> shown in the output of pg_controldata. (pg12+ will have a function to
> get it from SQL, but released versions don't.)
Umm, that function has been there since pg 9.6
select left(version(),17), system_identifier from pg_control_system();
left | system_identifier
-------------------+---------------------
PostgreSQL 9.6.11 | 6320270156373568679
(1 row)
Joe
--
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To: pgsql-admin@postgresql.org
Cc: mail@joeconway.com, andrew@tao11.riddles.org.uk, sbob@quadratum-braccas.com
Subject: Re: Unique cluster / instance identifier?
In-Reply-To: <da5904c4-cbe2-fb02-3a5d-42d8f18a057d@joeconway.com>
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