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Michael Paquier b4529005fd Revert "Add single-item cache when looking at topmost XID of a subtrans XID" 
This reverts commit 06f5295 as per issues with this approach, both in
terms of efficiency impact and stability.  First, contrary to the
single-item cache for transaction IDs in transam.c, the cache may finish
by not be hit for a long time, and without an invalidation mechanism to
clear it, it would cause inconsistent results on wraparound for
example.  Second, the use of SubTransGetTopmostTransaction() for the
caching has a limited impact on performance.  SubTransGetParent() could
have more impact, though the benchmarking of the single-item approach
still needs to be proved, particularly under the conditions where SLRU
lookups are stressed in parallel with overflowed snapshots (aka more
than 64 subxids generated, for example).

After discussion with Andres Freund.

Discussion: https://postgr.es/m/20220524235250.gtt3uu5zktfkr4hv@alap3.anarazel.de
2022-05-28 15:02:08 +09:00
config Pre-beta mechanical code beautification. 2022-05-12 15:17:30 -04:00
contrib Add a new shmem_request_hook hook. 2022-05-13 09:31:06 -04:00
doc In CREATE FOREIGN TABLE syntax synopsis, fix partitioning stuff. 2022-05-26 12:54:33 -04:00
src Revert "Add single-item cache when looking at topmost XID of a subtrans XID" 2022-05-28 15:02:08 +09:00
.cirrus.yml Make upgradecheck a no-op in MSVC's vcregress.pl 2022-04-02 12:06:11 +09:00
.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 23e7b38bf to git-blame-ignore-revs. 2022-05-12 15:22:20 -04:00
.gitattributes Remove trailing whitespace from *.sgml files. 2022-04-20 11:04:49 -04:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Stamp 15beta1. 2022-05-16 17:10:42 -04:00
configure.ac Stamp 15beta1. 2022-05-16 17:10:42 -04:00
COPYRIGHT Update copyright for 2022 2022-01-07 19:04:57 -05:00
GNUmakefile.in add missing tag from commit b8c4261e5e 2021-07-01 15:47:46 -04:00
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

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/.