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Re: pg_upgrade failing for 200+ million Large Objects

Laurenz Albe <laurenz.albe@cybertec.at>

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From: Laurenz Albe <laurenz.albe@cybertec.at>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Nathan Bossart <nathandbossart@gmail.com>, vignesh C <vignesh21@gmail.com>, "Kumar, Sachin" <ssetiya@amazon.com>, Robins Tharakan <tharakan@gmail.com>, Jan Wieck <jan@wi3ck.info>, Bruce Momjian <bruce@momjian.us>, Andrew Dunstan <andrew@dunslane.net>, Magnus Hagander <magnus@hagander.net>, Peter Eisentraut <peter.eisentraut@enterprisedb.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2024-03-17T17:57:45Z
Lists: pgsql-hackers 
On Sat, 2024-03-16 at 18:46 -0400, Tom Lane wrote:
> > Without the patch:
> > Runtime: 74.5 minutes
> 
> > With the patch:
> > Runtime: 70 minutes
> 
> Hm, I'd have hoped for a bit more runtime improvement.

I did a second run with the patch, and that finished in 66 minutes,
so there is some jitter there.

I think the reduced memory footprint and the reduced transaction ID
consumption alone make this patch worthwhile.

Yours,
Laurenz Albe

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Count individual SQL commands in pg_restore's --transaction-size mode.

  2. Reduce number of commands dumpTableSchema emits for binary upgrade.

  3. Invent --transaction-size option for pg_restore.

  4. Rearrange pg_dump's handling of large objects for better efficiency.

  5. Add temporal PRIMARY KEY and UNIQUE constraints

  6. Fix typo and case in messages