Re: Vacuum ERRORs out considering freezing dead tuples from before OldestXmin

Melanie Plageman <melanieplageman@gmail.com>

From: Melanie Plageman <melanieplageman@gmail.com>

To: Peter Geoghegan <pg@bowt.ie>

Cc: Pg Hackers <pgsql-hackers@postgresql.org>, Andres Freund <andres@anarazel.de>, Noah Misch <noah@leadboat.com>

Date: 2024-07-31T21:46:54Z

Lists: pgsql-hackers

Commits

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

Test that vacuum removes tuples older than OldestXmin
- 2c0bc4765741 17.6 landed
- 303ba0573ce6 18.0 landed
- 80c34692e8e6 17.0 landed
- aa607980aee0 18.0 landed
Lower minimum maintenance_work_mem to 64kB
- 2eda3df9ad53 17.0 landed
- bbf668d66fbf 18.0 landed
Add accidentally omitted test to meson build file
- 9d198f4d3e3b 16.4 landed
Use DELETE instead of UPDATE to speed up vacuum test
- 924a08b76f5d 14.13 landed
- 9744fe24118b 15.8 landed
- 571e0ee40ebd 16.4 landed
Revert "Test that vacuum removes tuples older than OldestXmin"
- efcbb76efe40 18.0 landed
- 1a3e90948b50 17.0 landed
Ensure vacuum removes all visibly dead tuples older than OldestXmin
- fd4f12df5e46 17.0 landed
- 83c39a1f7f3f 18.0 landed

On Wed, Jul 31, 2024 at 4:38 PM Peter Geoghegan <pg@bowt.ie> wrote:
>
> On Thu, Jun 20, 2024 at 7:42 PM Melanie Plageman
> <melanieplageman@gmail.com> wrote:
> > In back branches starting with 14, failing to remove tuples older than
> > OldestXmin during pruning caused vacuum to infinitely loop in
> > lazy_scan_prune(), as investigated on this [1] thread.
>
> Shouldn't somebody remove the entry that we have for this issue under
> https://wiki.postgresql.org/wiki/PostgreSQL_17_Open_Items#Older_bugs_affecting_stable_branches?

Thanks for the reminder. Done!

- Melanie