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Andres Freund 408209d6a9 Avoid edge case in pg_visibility test with small shared_buffers 
Since 82a4edabd2 we can bulk extend relations. The bulk relation extension
logic has a heuristic component. Normally the heurstic does not trigger in the
occasionally-failing test case, as the relation is only extended once. But
with very small shared_buffers the limits for the number of buffers pinned at
once prevent the extension from happening at once. With the second "bulk"
extension, the heuristic kicks in, and the relation ends up one block bigger.
That's ok from a correctness perspective, but changes the results of the test
query due to one additional block.

We discussed a few more expansive fixes, but for now have decided to avoid
this by making the table a bit smaller.

Author: Heikki Linnakangas <hlinnaka@iki.fi>
Reported-by:
Discussion: https://postgr.es/m/29c74104-210b-ef39-2522-27a6aa7a704f@iki.fi
Discussion: https://postgr.es/m/20230916000011.2ugpkkkp7bpp4cfh@awork3.anarazel.de
Backpatch: 16-, where the new relation extension logic was added
2024-03-25 20:20:34 -07:00
config Log LLVM library version in configure output. 2023-10-22 14:23:11 +13:00
contrib Avoid edge case in pg_visibility test with small shared_buffers 2024-03-25 20:20:34 -07:00
doc doc: Clarify requirements for SET ROLE. 2024-03-24 15:24:09 -05:00
src Clarify comment for LogicalTapeSetBlocks(). 2024-03-25 12:00:30 -07:00
.cirrus.star ci: Prepare to make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.cirrus.tasks.yml ci: macos: Choose python version 2024-03-25 13:14:28 -07:00
.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 b334612b8 to .git-blame-ignore-revs. 2023-06-20 09:52:52 -04:00
.gitattributes Remove non-existing file from .gitattributes 2024-02-16 11:40:53 +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 Fix gai_strerror() thread-safety on Windows. 2024-02-12 11:14:42 +13:00
configure.ac Fix gai_strerror() thread-safety on Windows. 2024-02-12 11:14:42 +13:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:04 -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
meson.build meson: macos: Avoid warnings on Sonoma 2024-03-13 01:40:48 -07:00
meson_options.txt meson: Attach colon to keyword argument 2023-06-29 12:53:41 +02:00
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

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/.