Date: Wed, 28 Sep 2022 13:12:22 -0700
From: Nathan Bossart <nathandbossart@gmail.com>
To: Stephen Frost <sfrost@snowman.net>
Cc: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>,
	"David G. Johnston" <david.g.johnston@gmail.com>,
	Kyotaro Horiguchi <horikyota.ntt@gmail.com>,
	Michael Paquier <michael@paquier.xyz>,
	Robert Haas <robertmhaas@gmail.com>,
	"pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Subject: Re: predefined role(s) for VACUUM and ANALYZE
Message-ID: <20220928201222.GA1400058@nathanxps13>
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On Wed, Sep 28, 2022 at 03:09:46PM -0400, Stephen Frost wrote:
> On Wed, Sep 28, 2022 at 14:50 Nathan Bossart <nathandbossart@gmail.com>
> wrote:
>> I've been testing aclmask() with long aclitem arrays (2,000 entries is
>> close to the limit for pg_class entries), and I haven't found any
>> significant impact from bumping AclMode to 64 bits.
> 
> The max is the same regardless of the size..?  Considering the size is
> capped since pg_class doesn’t (and isn’t likely to..) have a toast table,
> that seems unlikely, so I’m asking for clarification on that. We may be
> able to get consensus that the difference isn’t material since no one is
> likely to have such long lists, but we should at least be aware.

While pg_class doesn't have a TOAST table, that column is marked as
"extended," so I believe it is still compressed, and the maximum aclitem
array length for pg_class.relacl would depend on how well the array
compresses.

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com