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0fdab27ad6
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Andres Freund 0fdab27ad6 Allow logical decoding on standbys 
Unsurprisingly, this requires wal_level = logical to be set on the primary and
standby. The infrastructure added in 26669757b6 ensures that slots are
invalidated if the primary's wal_level is lowered.

Creating a slot on a standby waits for a xl_running_xact record to be
processed. If the primary is idle (and thus not emitting xl_running_xact
records), that can take a while.  To make that faster, this commit also
introduces the pg_log_standby_snapshot() function. By executing it on the
primary, completion of slot creation on the standby can be accelerated.

Note that logical decoding on a standby does not itself enforce that required
catalog rows are not removed. The user has to use physical replication slots +
hot_standby_feedback or other measures to prevent that. If catalog rows
required for a slot are removed, the slot is invalidated.

See 6af1793954 for an overall design of logical decoding on a standby.

Bumps catversion, for the addition of the pg_log_standby_snapshot() function.

Author: "Drouvot, Bertrand" <bertranddrouvot.pg@gmail.com>
Author: Andres Freund <andres@anarazel.de> (in an older version)
Author: Amit Khandekar <amitdkhan.pg@gmail.com> (in an older version)
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: FabrÌzio de Royes Mello <fabriziomello@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-By: Robert Haas <robertmhaas@gmail.com>
2023-04-08 02:20:05 -07:00
config autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
contrib Introduce PG_IO_ALIGN_SIZE and align all I/O buffers. 2023-04-08 16:34:50 +12:00
doc Allow logical decoding on standbys 2023-04-08 02:20:05 -07:00
src Allow logical decoding on standbys 2023-04-08 02:20:05 -07:00
.cirrus.yml Allow to use system CA pool for certificate verification 2023-04-05 23:22:17 +02:00
.dir-locals.el
.editorconfig
.git-blame-ignore-revs Add b6dfee28 to .git-blame-ignore-revs 2023-03-09 19:26:03 +09:00
.gitattributes gitattributes: Ignore imported pg_bsd_indent code for whitespace checks 2023-02-22 09:00:28 +01:00
.gitignore
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure libpq: Add sslcertmode option to control client certificates 2023-03-24 13:34:26 +09:00
configure.ac libpq: Add sslcertmode option to control client certificates 2023-03-24 13:34:26 +09:00
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
Makefile
meson_options.txt meson: docs: Allow configuring simple/website style 2023-04-04 21:31:27 -07:00
meson.build meson: add docs, docs_pdf options 2023-04-04 21:29:39 -07:00
README
README.git

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/.