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		11 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.	12 months ago
doc	doc: Remove dead link to NewbieDoc Docbook Guide	11 months ago
src	Test that vacuum removes tuples older than OldestXmin	11 months ago
.cirrus.star	Remove duplicate words in docs and code comments.	3 years ago
.cirrus.tasks.yml	ci: Upgrade FreeBSD image	1 year ago
.cirrus.yml	ci: Make compute resources for CI configurable	3 years ago
.dir-locals.el	Make Emacs perl-mode indent more like perltidy.	7 years ago
.editorconfig	Add .editorconfig	7 years ago
.git-blame-ignore-revs	Add commit `7229ebe011` to .git-blame-ignore-revs.	2 years ago
.gitattributes	Exclude LLVM files from whitespace checks	2 years ago
.gitignore	Update top-level .gitignore.	4 years ago
COPYRIGHT	Align organization wording in copyright statement	1 year ago
GNUmakefile.in	Allow selecting the git revision to be packaged by "make dist".	2 years ago
HISTORY	Canonicalize some URLs	6 years ago
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	4 years ago
configure	Make our usage of memset_s() conform strictly to the C11 standard.	1 year ago
configure.ac	Make our usage of memset_s() conform strictly to the C11 standard.	1 year ago
meson.build	meson: Fix meson warning	11 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/.