From: hubert depesz lubaczewski <depesz@depesz.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: pgsql-general <pgsql-general@lists.postgresql.org>
Subject: Re: Can we get rid of repeated queries from pg_dump?
Date: Mon, 30 Aug 2021 16:45:51 +0200
Message-ID: <20210830144551.GA27054@depesz.com> (raw)
In-Reply-To: <1349119.1630332682@sss.pgh.pa.us>
References: <20210826084430.GA26282@depesz.com>
<648517.1629986527@sss.pgh.pa.us>
<20210826140827.GA15868@depesz.com>
<649446.1629987629@sss.pgh.pa.us>
<20210826160644.GA3120@depesz.com>
<e6a7503afd115d111fbb96c5787906d73cfe2605.camel@cybertec.at>
<896732.1630099403@sss.pgh.pa.us>
<20210830074442.GB15241@depesz.com>
<1349119.1630332682@sss.pgh.pa.us>
On Mon, Aug 30, 2021 at 10:11:22AM -0400, Tom Lane wrote:
> I don't suppose you could send me a schema-only dump of that
> database, off-list? I'm now quite curious.
Asked the owners for their permission.
> > The thing is - even though it was called 1804 times, dump contains data only
> > about 107 functions (pg_restore -l schema.dump | grep -c FUNCTION), so it kinda
> > seems that 94% of these calls is not needed.
> Hm. It's not doing that for *every* row in pg_proc, at least.
> I speculate that it is collecting and then not printing the info
> about functions that are in extensions --- can you check on
> how many there are of those?
> (Actually, if you've got a whole lot of objects inside extensions,
> maybe that explains the 5000 calls?)
Well, not sure if that's a lot, but:
there are 15 extensions, including plpgsql.
SELECT
count(*)
FROM
pg_catalog.pg_depend
WHERE
refclassid = 'pg_catalog.pg_extension'::pg_catalog.regclass
AND deptype = 'e';
return 2110 objects:
SELECT
classid::regclass,
count(*)
FROM
pg_catalog.pg_depend
WHERE
refclassid = 'pg_catalog.pg_extension'::pg_catalog.regclass
AND deptype = 'e'
GROUP BY
1
ORDER BY
1;
classid │ count
─────────────────────────┼───────
pg_type │ 31
pg_proc │ 1729
pg_class │ 61
pg_foreign_data_wrapper │ 1
pg_cast │ 30
pg_language │ 1
pg_opclass │ 73
pg_operator │ 111
pg_opfamily │ 73
(9 rows)
Best regards,
depesz
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To: pgsql-general@postgresql.org
Cc: depesz@depesz.com, tgl@sss.pgh.pa.us, laurenz.albe@cybertec.at, pgsql-general@lists.postgresql.org
Subject: Re: Can we get rid of repeated queries from pg_dump?
In-Reply-To: <20210830144551.GA27054@depesz.com>
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