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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Alexander Lakhin <exclusion@gmail.com>
Cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #17368: Assert failed in GetSafeSnapshot() for SERIALIZABLE READ ONLY DEFERRABLE transaction
Date: Mon, 06 Mar 2023 20:16:37 -0500
Message-ID: <3777235.1678151797@sss.pgh.pa.us> (raw)
In-Reply-To: <CA+hUKG+yRrVXLzo0v+MQ=9aZcy8GFAO8MSLnJcNjBDtFU_QQrw@mail.gmail.com>
References: <17368-98a4f99e8e4b4402@postgresql.org>
	<18a116d2-7927-6a62-aa60-ab16c53183f9@gmail.com>
	<CA+hUKG+4m+fvnM_Czyp3Z_h4SaqmwR7sq9XE=k0GcaL_afEfUA@mail.gmail.com>
	<CA+hUKGKYLSa4S7cMYgZXXA+cNTdr1COWtNj1HSc-Y62jwWmv7w@mail.gmail.com>
	<3766597.1678146140@sss.pgh.pa.us>
	<CA+hUKG+yRrVXLzo0v+MQ=9aZcy8GFAO8MSLnJcNjBDtFU_QQrw@mail.gmail.com>

Thomas Munro <thomas.munro@gmail.com> writes:
> On Tue, Mar 7, 2023 at 12:42 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> What if they both touched/modified a shared catalog?

> I was assuming that that would already skip all predicate locking because:

> /*
>  * Does this relation participate in predicate locking? Temporary and system
>  * relations are exempt.
>  */

Oh, I'd forgotten about that.

> If we ever wanted to use SSI on catalogs, or allow shared relations
> that aren't catalogs, or allow cross-database access, then this
> optimisation wouldn't fly.

I suppose there are some gotchas in the way of making that happen,
so okay.

			regards, tom lane





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