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Michael Paquier 8a8661828a Fix corruption of templates after CREATE DATABASE .. STRATEGY WAL_LOG 
WAL_LOG does a scan of the template's pg_class to determine the set of
relations that need to be copied from a template database to the new
one.  However, as coded in 9c08aea, this copy strategy would load the
pages of pg_class without considering it as a permanent relation,
causing the loaded pages to never be flushed when they should.  Any
modification of the template's pg_class, mostly through DDLs, would then
be missed, causing corruptions.

STRATEGY = WAL_LOG is the default over FILE_COPY since it has been
introduced, so any changes done to pg_class on a database template would
be gone.  Updates of database templates should be a rare thing, so the
impact of this bug should be hopefully limited.  The pre-14 default
strategy FILE_COPY is safe, and can be used as a workaround.

Ryo Matsumura has found and analyzed the issue, and Nathan has written a
test able to reproduce the failure (with few tweaks from me).

Backpatch down to 15, where STRATEGY = WAL_LOG has been introduced.

Author: Nathan Bossart, Ryo Matsumura
Reviewed-by: Dilip Kumar, Michael Paquier
Discussion: https://postgr.es/m/TYCPR01MB6868677E499C9AD5123084B5E8A39@TYCPR01MB6868.jpnprd01.prod.outlook.com
Backpatch-through: 15
 		2023-02-22 10:14:52 +09:00
config autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
contrib Fix handling of escape sequences in postgres_fdw.application_name 2023-02-21 20:01:43 +09:00
doc Redesign archive modules 2023-02-17 14:26:42 +09:00
src Fix corruption of templates after CREATE DATABASE .. STRATEGY WAL_LOG 2023-02-22 10:14:52 +09:00
.cirrus.yml ci: freebsd: stop postgres instance on failure, to prevent log upload failures 2023-02-06 15:41:38 -08:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add 250c8ee07e to git-blame-ignore-revs 2023-01-13 15:33:49 -08:00
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COPYRIGHT Update copyright for 2023 2023-01-02 15:00:37 -05:00
GNUmakefile.in Integrate pg_bsd_indent into our build/test infrastructure. 2023-02-12 12:22:21 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
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meson.build Remove obsolete platforms from ps_status.c. 2023-02-17 15:18:18 +13:00
meson_options.txt Update copyright for 2023 2023-01-02 15:00:37 -05:00

README 

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.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.