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Heikki Linnakangas 2817525f0d Fix rare assertion failure in standby, if primary is restarted 
During hot standby, ExpireAllKnownAssignedTransactionIds() and
ExpireOldKnownAssignedTransactionIds() functions mark old transactions
as no-longer running, but they failed to update xactCompletionCount
and latestCompletedXid. AFAICS it would not lead to incorrect query
results, because those functions effectively turn in-progress
transactions into aborted transactions and an MVCC snapshot considers
both as "not visible". But it could surprise GetSnapshotDataReuse()
and trigger the "TransactionIdPrecedesOrEquals(TransactionXmin,
RecentXmin))" assertion in it, if the apparent xmin in a backend would
move backwards. We saw this happen when GetCatalogSnapshot() would
reuse an older catalog snapshot, when GetTransactionSnapshot() had
already advanced TransactionXmin.

The bug goes back all the way to commit 623a9ba79b in v14 that
introduced the snapshot reuse mechanism, but it started to happen more
frequently with commit 952365cded which removed a
GetTransactionSnapshot() call from backend startup. That made it more
likely for ExpireOldKnownAssignedTransactionIds() to be called between
GetCatalogSnapshot() and the first GetTransactionSnapshot() in a
backend.

Andres Freund first spotted this assertion failure on buildfarm member
'skink'. Reproduction and analysis by Tomas Vondra.

Backpatch-through: 14
Discussion: https://www.postgresql.org/message-id/oey246mcw43cy4qw2hqjmurbd62lfdpcuxyqiu7botx3typpax%40h7o7mfg5zmdj
2025-03-23 20:41:16 +02:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Be more paranoid in configure's checks for CRC and POPCNT intrinsics. 2025-03-20 16:23:09 -04:00
contrib Revert workarounds for -Wmissing-braces false positives on old GCC 2025-03-20 11:25:58 +01:00
doc Add GUC option to control maximum active replication origins. 2025-03-21 12:20:15 -07:00
src Fix rare assertion failure in standby, if primary is restarted 2025-03-23 20:41:16 +02:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: Remove installation of libcurl 2025-03-05 22:12:20 +01:00
.cirrus.yml ci: Test NetBSD and OpenBSD 2025-02-12 09:40:07 -05:00
.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 796bdda484 to .git-blame-ignore-revs. 2025-03-18 17:00:23 -05:00
.gitattributes Add script to keep .editorconfig in sync with .gitattributes 2025-02-01 10:09:45 +01:00
.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 Be more paranoid in configure's checks for CRC and POPCNT intrinsics. 2025-03-20 16:23:09 -04:00
configure.ac Add support for OAUTHBEARER SASL mechanism 2025-02-20 16:25:17 +01:00
COPYRIGHT Update copyright for 2025 2025-01-01 11:21:55 -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 Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build Show plperl version in the meson setup summary. 2025-03-20 18:55:29 -04:00
meson_options.txt Add support for OAUTHBEARER SASL mechanism 2025-02-20 16:25:17 +01:00
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/.