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Melanie Plageman b4c1b2be30 Update FSM during prune/freeze replay even if freespace is zero 
add323da40 started updating the visibility map in the same WAL record
as pruning and freezing. This included updating the freespace map during
replay of a record setting the VM, which we've done since ab7dbd681.

add323da40, however, conditioned doing so on there being > 0 freespace
on the page, which differed from the previous state for records updating
the VM.

The FSM is not WAL-logged and is instead updated heuristically on
standbys. In rare cases, this heuristic could lead to pages with 0
freespace having outdated entries in the FSM. If the standby is later
promoted and vacuum skips these pages because they are marked
all-visible/all-frozen, overly optimistic values would be propagated up
the FSM tree, causing slowness when searching for freespace for new
tuples.

Fix it by always updating the FSM during replay when setting VM bits.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reported-by: Alexey Makhmutov <a.makhmutov@postgrespro.ru>
Discussion: https://postgr.es/m/ead2f110-c736-48f5-99e1-023dc9acbf0b%40postgrespro.ru
2026-04-16 12:10:47 -04:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Update config.guess and config.sub 2026-04-09 11:26:14 +02:00
contrib Fix pg_overexplain to emit valid output with RANGE_TABLE option. 2026-04-16 13:47:07 +09:00
doc doc PG 19 relnotes: update author 2026-04-16 11:23:55 -04:00
src Update FSM during prune/freeze replay even if freespace is zero 2026-04-16 12:10:47 -04:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml Enable test_cplusplusext with MSVC 2026-04-01 07:48:47 +02:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:54:03 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.git-blame-ignore-revs Add a couple of commits to .git-blame-ignore-revs. 2026-04-08 13:41:22 -05:00
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.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Add errdetail() with PID and UID about source of termination signal. 2026-04-07 10:22:33 -04:00
configure.ac Add errdetail() with PID and UID about source of termination signal. 2026-04-07 10:22:33 -04:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -05:00
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 Restore AIX support. 2026-02-23 13:34:22 -05:00
meson.build MSVC: Turn missing function declaration into an error 2026-04-16 09:53:03 +02:00
meson_options.txt Revert "Add built-in fuzzing harnesses for security testing." 2026-04-10 09:53:58 -04:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

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/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/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/.