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Melanie Plageman 2c0bc47657 Test that vacuum removes tuples older than OldestXmin 
If vacuum fails to prune a tuple killed before OldestXmin, it will
decide to freeze its xmax and later error out in pre-freeze checks.

Add a test reproducing this scenario to the recovery suite which creates
a table on a primary, updates the table to generate dead tuples for
vacuum, and then, during the vacuum, uses a replica to force
GlobalVisState->maybe_needed on the primary to move backwards and
precede the value of OldestXmin set at the beginning of vacuuming the
table.

This test is coverage for a case fixed in 83c39a1f7f. The test was
originally committed to master in aa607980ae but later reverted in
efcbb76efe due to test instability.

The test requires multiple index passes. In Postgres 17+, vacuum uses a
TID store for the dead TIDs that is very space efficient. With the old
minimum maintenance_work_mem of 1 MB, it required a large number of dead
rows to generate enough dead TIDs to force multiple index
vacuuming passes. Once the source code changes were made to allow a
minimum maintenance_work_mem value of 64kB, the test could be made much
faster and more stable.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: John Naylor <johncnaylorls@gmail.com>
Reviewed-by: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAAKRu_ZJBkidusDut6i%3DbDCiXzJEp93GC1%2BNFaZt4eqanYF3Kw%40mail.gmail.com
Backpatch-through: 17
2025-06-24 09:21:55 -04:00
config jit: Remove {llvm-config,clang}-N configure probes. 2024-05-16 13:58:25 +12:00
contrib Fix re-distributing previously distributed invalidation messages during logical decoding. 2025-06-16 17:35:58 -07:00
doc doc: Remove dead link to NewbieDoc Docbook Guide 2025-06-24 11:49:37 +02:00
src Test that vacuum removes tuples older than OldestXmin 2025-06-24 09:21:55 -04:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: Upgrade FreeBSD image 2025-03-05 10:29:08 -05:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add commit 7229ebe011 to .git-blame-ignore-revs. 2024-09-14 20:17:30 +02:00
.gitattributes Exclude LLVM files from whitespace checks 2024-11-27 11:09:27 +01:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Make our usage of memset_s() conform strictly to the C11 standard. 2025-05-18 12:45:55 -04:00
configure.ac Make our usage of memset_s() conform strictly to the C11 standard. 2025-05-18 12:45:55 -04:00
COPYRIGHT Align organization wording in copyright statement 2025-05-16 11:20:07 -04:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Adapt REL_17_STABLE to its new status as a stable branch 2024-07-01 08:05:35 +09:00
meson.build meson: Fix meson warning 2025-06-22 14:15:35 +02:00
meson_options.txt Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
README.md Adapt REL_17_STABLE to its new status as a stable branch 2024-07-01 08:05:35 +09:00

README.md

PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.