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		8 months ago
config	jit: Remove {llvm-config,clang}-N configure probes.	2 years ago
contrib	Fix re-distributing previously distributed invalidation messages during logical decoding.	9 months ago
doc	doc: Remove dead link to NewbieDoc Docbook Guide	8 months ago
src	Test that vacuum removes tuples older than OldestXmin	8 months ago
.cirrus.star	Remove duplicate words in docs and code comments.	2 years ago
.cirrus.tasks.yml	ci: Upgrade FreeBSD image	12 months ago
.cirrus.yml	ci: Make compute resources for CI configurable	3 years ago
.dir-locals.el	…
.editorconfig	…
.git-blame-ignore-revs	Add commit `7229ebe011` to .git-blame-ignore-revs.	1 year ago
.gitattributes	Exclude LLVM files from whitespace checks	1 year ago
.gitignore	Update top-level .gitignore.	3 years ago
COPYRIGHT	Align organization wording in copyright statement	10 months ago
GNUmakefile.in	Allow selecting the git revision to be packaged by "make dist".	2 years ago
HISTORY	…
Makefile	Adapt REL_17_STABLE to its new status as a stable branch	2 years ago
README.md	Adapt REL_17_STABLE to its new status as a stable branch	2 years ago
aclocal.m4	autoconf: Move export_dynamic determination to configure	3 years ago
configure	Make our usage of memset_s() conform strictly to the C11 standard.	10 months ago
configure.ac	Make our usage of memset_s() conform strictly to the C11 standard.	10 months ago
meson.build	meson: Fix meson warning	8 months ago
meson_options.txt	Allow selecting the git revision to be packaged by "make dist".	2 years ago

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.

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/.