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Thomas Munro a493f93342 Fix nextXid tracking bug on standbys (9.5-11 only). 
RecordKnownAssignedTransactionIds() should never move
nextXid backwards.  Before this commit, that could happen
if some other code path had advanced it without advancing
latestObservedXid.

One consequence is that a well timed XLOG_CHECKPOINT_ONLINE
could cause hot standby feedback messages to get confused
and report an xmin from a future epoch, potentially allowing
vacuum to run too soon on the primary.

Repair, by making sure RecordKnownAssignedTransactionIds()
can only move nextXid forwards.

In release 12 and master, this was already done by commit
2fc7af5e, which consolidated similar code and straightened
out this bug.  Back-patch to supported releases before that.

Author: Eka Palamadai <ekanatha@amazon.com>
Discussion: https://postgr.es/m/98BB4805-D0A2-48E1-96F4-15014313EADC@amazon.com
 		2020-03-12 18:06:54 +13:00
config configure: Update python search order 2019-01-13 10:24:21 +01:00
contrib Paper over bt_metap() oldest_xact bug in backbranches. 2020-03-11 14:15:00 -07:00
doc Fix the name of the first WAL segment file, in docs. 2020-03-03 12:23:45 +09:00
src Fix nextXid tracking bug on standbys (9.5-11 only). 2020-03-12 18:06:54 +13:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:36 -08:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
COPYRIGHT Update copyrights for 2020 2020-01-01 12:21:44 -05:00
GNUmakefile.in Process EXTRA_INSTALL serially, during the first temp-install. 2018-12-31 13:55:01 -08:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:40:20 +12:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Stamp 11.7. 2020-02-10 17:17:28 -05:00
configure.in Stamp 11.7. 2020-02-10 17:17:28 -05:00

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/.