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From: Justin Pryzby <[email protected]>
To: Alexander Korotkov <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Nathan Bossart <[email protected]>
Cc: Michael Banck <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: vignesh C <[email protected]>
Cc: Kumar, Sachin <[email protected]>
Cc: Robins Tharakan <[email protected]>
Cc: Jan Wieck <[email protected]>
Cc: Bruce Momjian <[email protected]>
Cc: Andrew Dunstan <[email protected]>
Cc: Magnus Hagander <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: [email protected]
Subject: Re: pg_upgrade failing for 200+ million Large Objects
Date: Fri, 26 Jul 2024 15:36:20 -0500
Message-ID: <ZqQIxIsaPWO6coil@pryzbyj2023> (raw)
In-Reply-To: <CAPpHfduUSA7c0YrTxN443SwXXCL41vmXkavYJjN8GS3Wc5Z42w@mail.gmail.com>
References: <[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<20240327150826.GB3994937@nathanxps13>
	<20240401191930.GA2302032@nathanxps13>
	<[email protected]>
	<ZqEND4ZcTDBmcv31@pryzbyj2023>
	<CAPpHfduUSA7c0YrTxN443SwXXCL41vmXkavYJjN8GS3Wc5Z42w@mail.gmail.com>

On Wed, Jul 24, 2024 at 09:17:51AM -0500, Justin Pryzby wrote:
> With partitioning, we have a lot of tables, some of them wide (126
> partitioned tables, 8942 childs, total 1019315 columns).

On Fri, Jul 26, 2024 at 10:53:30PM +0300, Alexander Korotkov wrote:
> It would be nice to identify such cases and check which memory contexts are
> growing and why.

I reproduced the problem with this schema:

SELECT format('CREATE TABLE p(i int, %s) PARTITION BY RANGE(i)', array_to_string(a, ', ')) FROM (SELECT array_agg(format('i%s int', i))a FROM generate_series(1,999)i);
SELECT format('CREATE TABLE t%s PARTITION OF p FOR VALUES FROM (%s)TO(%s)', i,i,i+1) FROM generate_series(1,999)i;

This used over 4 GB of RAM.
3114201 pryzbyj   20   0 5924520   4.2g  32476 T   0.0  53.8   0:27.35 postgres: pryzbyj postgres [local] UPDATE

The large context is:
2024-07-26 15:22:19.280 CDT [3114201] LOG:  level: 1; CacheMemoryContext: 5211209088 total in 50067 blocks; 420688 free (14 chunks); 5210788400 used

Note that there seemed to be no issue when I created 999 tables without
partitioning:

SELECT format('CREATE TABLE t%s(LIKE p)', i,i,i+1) FROM generate_series(1,999)i;

-- 
Justin






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