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Andres Freund 5a1e1d8302 Use correct horizon when vacuuming catalog relations. 
In dc7420c2c9 I (Andres) accidentally used
RelationIsAccessibleInLogicalDecoding() as the sole condition to use the
non-shared catalog horizon in GetOldestNonRemovableTransactionId(). That is
incorrect, as RelationIsAccessibleInLogicalDecoding() checks whether wal_level
is logical.

The correct check, as done e.g. in GlobalVisTestFor(), is to check
IsCatalogRelation() and RelationIsAccessibleInLogicalDecoding().

The observed misbehavior of this bug was that there could be an endless loop
in lazy_scan_prune(), because the horizons used in heap_page_prune() and the
individual tuple liveliness checks did not match. Likely there are other
potential consequences as well.

A later commit will unify the determination which horizon has to be used, and
add additional assertions to make it easier to catch a bug like this.

Reported-By: Justin Pryzby <pryzby@telsasoft.com>
Diagnosed-By: Matthias van de Meent <boekewurm+postgres@gmail.com>
Author: Matthias van de Meent <boekewurm+postgres@gmail.com>
Discussion: https://postgr.es/m/CAEze2Wg32Y9+WJfw=aofkRx1ZRFt_Ev6bNPc4PSaz7PjSFtZgQ@mail.gmail.com
2021-06-21 05:13:46 -07:00
config Update config.guess and config.sub 2021-04-21 16:33:40 +02:00
contrib amcheck: Fix code comments 2021-06-21 11:17:49 +02:00
doc Finish rename of PQtraceSetFlags() to PQsetTraceFlags(). 2021-06-21 02:48:11 -07:00
src Use correct horizon when vacuuming catalog relations. 2021-06-21 05:13:46 -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
.gitattributes gitattributes: Add new entry to silence whitespace error 2021-06-05 07:57:31 +02:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Remove configure-time probe for DocBook DTD. 2020-11-30 15:24:13 -05:00
configure Stamp 14beta1. 2021-05-17 16:11:18 -04:00
configure.ac Stamp 14beta1. 2021-05-17 16:11:18 -04:00
COPYRIGHT Update copyright for 2021 2021-01-02 13:06:25 -05:00
GNUmakefile.in Make install-tests target work with vpath builds 2020-05-31 18:33:00 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
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/.