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In-Reply-To: <20150211104038.5402756.43145.2247@gmail.com>
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 <20150211104038.5402756.43145.2247@gmail.com>
Date: Wed, 11 Feb 2015 10:49:07 -0000
Subject: Re: Advisory locks
From: "Tom Paynter" <tompaynter@tdpe.co.uk>
To: pgsql-sql@postgresql.org
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Thank you S=E1ndor,

Just out of interest, is the following done just to make sure a row exists:
SELECT pg_advisory_lock(table_a_id) FROM table_a WHERE table_a_id=3D5;

As opposed to:
SELECT pg_advisory_lock(5);

Cheers,
Tom


On Wed, February 11, 2015 10:40 am, daku.sandor@gmail.com wrote:
> The parameter of the pg_advisory_lock is a simple bigint and of course it
> is completely unaware of the source of the value.
>
> Regards,
> S=E1ndor Daku
>
>
> =A0 Original Message =A0
> From: Tom Paynter
> Sent: 2015. febru=E1r 11., szerda 11:33
> To: pgsql-sql@postgresql.org
> Subject: [SQL] Advisory locks
>
>
> Hello All,
>
>
> I have a quick question about advisory locks, that I have not been able
> to figure out from the documentation.
>
>
> Say I have two tables:
> CREATE TABLE table_a
> (
> table_a_id serial primary key, some more rows.... );
>
>
> CREATE TABLE table_b
> (
> table_b_id serial primary key, some more rows.... );
>
>
>
> And I execute the following lines (from separate sessions):
> SELECT pg_advisory_lock(table_a_id) FROM table_a WHERE table_a_id=3D5;
> SELECT pg_advisory_lock(table_b_id) FROM table_b WHERE table_b_id=3D5;
>
>
>
> Will this try to acquire the same lock?
> Or is the id tied to the table somehow?
>
>
>
> Thanks for your time.
> Tom
>
>
>
>
> --
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>


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