Alexander Korotkov ca307d5cec Keep WAL segments by slot's last saved restart LSN The patch fixes the issue with the unexpected removal of old WAL segments after checkpoint, followed by an immediate restart. The issue occurs when a slot is advanced after the start of the checkpoint and before old WAL segments are removed at the end of the checkpoint. The patch introduces a new in-memory state for slots: last_saved_restart_lsn, which is used to calculate the oldest LSN for removing WAL segments. This state is updated every time with the current restart_lsn at the moment when the slot is saved to disk. This fix changes the shared memory layout. It's applied to HEAD only because we don't have to preserve ABI compatibility during the beta stage. Another fix that doesn't affect the ABI is committed to back branches. Discussion: https://postgr.es/m/1d12d2-67235980-35-19a406a0%4063439497 Author: Vitaly Davydov <v.davydov@postgrespro.ru> Author: Alexander Korotkov <aekorotkov@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>		8 months ago
.github	Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md.	2 years ago
config	oauth: Move the builtin flow into a separate module	9 months ago
contrib	Fix squashing algorithm for query texts	8 months ago
doc	psql: Reword help message and docs for WATCH_INTERVAL	8 months ago
src	Keep WAL segments by slot's last saved restart LSN	8 months ago
.cirrus.star	Remove duplicate words in docs and code comments.	2 years ago
.cirrus.tasks.yml	ci: Check for missing dependencies in meson builds	10 months ago
.cirrus.yml	ci: Test NetBSD and OpenBSD	12 months ago
.dir-locals.el	…
.editorconfig	Add script to keep .editorconfig in sync with .gitattributes	12 months ago
.git-blame-ignore-revs	Add commit `4672b6223` to .git-blame-ignore-revs.	8 months ago
.gitattributes	Add script to keep .editorconfig in sync with .gitattributes	12 months ago
.gitignore	…
.mailmap	Add a Git .mailmap file	1 year ago
COPYRIGHT	Align organization wording in copyright statement	8 months ago
GNUmakefile.in	Allow selecting the git revision to be packaged by "make dist".	2 years ago
HISTORY	…
Makefile	Remove AIX support	2 years ago
README.md	Revise the style of a paragraph in README.md.	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.	8 months ago
configure.ac	Make our usage of memset_s() conform strictly to the C11 standard.	8 months ago
meson.build	Make our usage of memset_s() conform strictly to the C11 standard.	8 months ago
meson_options.txt	Add support for basic NUMA awareness	10 months 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/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/.