Re: predefined role(s) for VACUUM and ANALYZE

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