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Melanie Plageman 3399c26554 Remove unneeded VM pin from VM replay 
Previously, heap_xlog_visible() called visibilitymap_pin() even after
getting a buffer from XLogReadBufferForRedoExtended() -- which returns a
pinned buffer containing the specified block of the visibility map.

This would just have resulted in visibilitymap_pin() returning early
since the specified page was already present and pinned, but it was
confusing extraneous code, so remove it. It doesn't seem worth
backporting, though.

It appears to be an oversight in 2c03216.

While we are at it, remove two VM-related redundant asserts in the COPY
FREEZE code path. visibilitymap_set() already asserts that
PD_ALL_VISIBLE is set on the heap page and checks that the vmbuffer
contains the bits corresponding to the specified heap block, so callers
do not also need to check this.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reported-by: Melanie Plageman <melanieplageman@gmail.com>
Reported-by: Kirill Reshke <reshkekirill@gmail.com>
Reviewed-by: Kirill Reshke <reshkekirill@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>

Discussion: https://postgr.es/m/CALdSSPhu7WZd%2BEfQDha1nz%3DDC93OtY1%3DUFEdWwSZsASka_2eRQ%40mail.gmail.com
2025-09-08 10:22:42 -04:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Improve prep_buildtree 2025-08-04 14:06:58 +02:00
contrib bufmgr: Remove freelist, always use clock-sweep 2025-09-05 12:25:59 -04:00
doc Allow to log raw parse tree. 2025-09-06 07:49:51 +09:00
src Remove unneeded VM pin from VM replay 2025-09-08 10:22:42 -04:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml ci: Explicitly enable Meson features 2025-09-03 07:54:24 -07:00
.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 Add script to keep .editorconfig in sync with .gitattributes 2025-02-01 10:09:45 +01:00
.git-blame-ignore-revs Add commit 1d1612aec7 to .git-blame-ignore-revs. 2025-07-29 10:32:53 -05:00
.gitattributes Fix git whitespace warning 2025-08-15 10:32:35 +02:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.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 Raise C requirement to C11 2025-08-26 11:50:46 +02:00
configure.ac Raise C requirement to C11 2025-08-26 11:50:46 +02:00
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 Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build oauth: Explicitly depend on -pthread 2025-08-26 14:16:31 -07:00
meson_options.txt Add support for basic NUMA awareness 2025-04-07 23:08:17 +02:00
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/.