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Michael Paquier d6e171fed6 Keep replication slot statistics on invalidation 
The code path in charge of invalidating a replication slot includes a
call to pgstat_drop_replslot(), which would result in removing the
statistics of the slot once invalidated.  However, there is no need to
remove the statistics of an invalidated slot as one could still be
interested in looking at them to understand the activity of the slot
until its actual removal.

The initial design of the feature committed in be87200efd used the
approach to drop the slots, which is likely why the statistics were
still removed during the invalidation.

Another problem with this operation is that it was done without holding
ReplicationSlotAllocationLock, leaving it unprotected on concurrent
activity.  This part is arguably a bug, but that's a limited problem in
practice so no backpatch is done.

In passing, this commit adds a test to check this behavior.  The only
remaining code path where slot statistics are dropped now related to the
slot getting dropped.

Author: Bertrand Drouvot
Discussion: https://postgr.es/m/ZermH08Eq6YydHpO@ip-10-97-1-34.eu-west-3.compute.internal
2024-03-12 14:22:31 +09:00
config Remove AIX support 2024-02-28 15:17:23 +04:00
contrib Fix deparsing of Consts in postgres_fdw ORDER BY 2024-03-11 12:27:11 +13:00
doc reindexdb: Allow specifying objects to process in all databases. 2024-03-11 15:42:27 -05:00
src Keep replication slot statistics on invalidation 2024-03-12 14:22:31 +09:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: Add test coverage of different pg_upgrade modes 2024-02-19 09:31:23 +01:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.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 a few recent commits to .git-blame-ignore-revs. 2024-03-05 14:15:06 -06:00
.gitattributes Remove non-existing file from .gitattributes 2024-02-16 11:39:09 +01:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Add --copy-file-range option to pg_upgrade. 2024-03-06 12:01:01 +13:00
configure.ac Add --copy-file-range option to pg_upgrade. 2024-03-06 12:01:01 +13:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
GNUmakefile.in Combine headerscheck and cpluspluscheck scripts 2024-03-10 07:56:17 +01:00
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 Add --copy-file-range option to pg_upgrade. 2024-03-06 12:01:01 +13:00
meson_options.txt Add backend support for injection points 2024-01-22 10:15:50 +09:00
README.md Convert README to Markdown. 2024-02-28 14:53:52 -06:00

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/.