| From: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
|---|---|
| To: | Michael Paquier <michael(at)paquier(dot)xyz> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: predefined role(s) for VACUUM and ANALYZE |
| Date: | 2022-09-20 23:31:17 |
| Message-ID: | 20220920233117.GA378596@nathanxps13 |
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| Lists: | pgsql-hackers |
On Tue, Sep 20, 2022 at 11:05:33AM -0700, Nathan Bossart wrote:
> On Tue, Sep 20, 2022 at 02:45:52PM +0900, Michael Paquier wrote:
>> Any impact for the column sizes of the catalogs holding ACL
>> information? Just asking while browsing the patch set.
>
> Since each aclitem requires 16 bytes instead of 12, I assume so. However,
> in my testing, I hit a "row is too big" error with the same number of
> aclitems in a pg_class row before and after the change. I might be missing
> something in my patch, or maybe I am misunderstanding how arrays of
> aclitems are stored on disk.
Ah, it looks like relacl is compressed. The column is marked "extended,"
but pg_class doesn't appear to have a TOAST table, so presumably no
out-of-line storage can be used. I found a couple of threads about this
[0] [1] [2].
[0] https://postgr.es/m/17245.964897719%40sss.pgh.pa.us
[1] https://postgr.es/m/200309040531.h845ViP05881%40candle.pha.pa.us
[2] https://postgr.es/m/29061.1265327626%40sss.pgh.pa.us
--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com
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