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Tom Lane 2207df7c34 Avoid trying to write an empty WAL record in log_newpage_range(). 
If the last few pages in the specified range are empty (all zero),
then log_newpage_range() could try to emit an empty WAL record
containing no FPIs.  This at least upsets an Assert in
ReserveXLogInsertLocation, and might perhaps have bad real-world
consequences in non-assert builds.

This has been broken since log_newpage_range() was introduced,
but the case was hard if not impossible to hit before commit 3d6a98457
decided it was okay to leave VM and FSM pages intentionally zero.
Nonetheless, it seems prudent to back-patch.  log_newpage_range()
was added in v12 but later back-patched, so this affects all
supported branches.

Matthias van de Meent, per report from Justin Pryzby

Discussion: https://postgr.es/m/ZD1daibg4RF50IOj@telsasoft.com
2023-04-17 14:22:06 -04:00
config Pre-beta mechanical code beautification. 2022-05-12 15:17:30 -04:00
contrib basebackup_to_shell: Check for a NULL return from OpenPipeStream. 2023-04-12 11:51:09 -04:00
doc doc: PQinitOpenSSL and PQinitSSL are obsolete in OpenSSL 1.1.0+ 2023-04-14 10:42:08 +02:00
src Avoid trying to write an empty WAL record in log_newpage_range(). 2023-04-17 14:22:06 -04:00
.cirrus.yml ci: Use windows VMs instead of windows containers 2023-02-02 21:31:48 -08:00
.dir-locals.el
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Backpatch addition of .git-blame-ignore-revs 2022-08-05 19:36:24 +02:00
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.gitignore Add portlock directory to .gitignore 2022-11-26 07:47:01 -05:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Fix detection of unseekable files for fseek() and ftello() with MSVC 2023-04-12 09:09:53 +09:00
configure.ac Fix detection of unseekable files for fseek() and ftello() with MSVC 2023-04-12 09:09:53 +09:00
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README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

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/.