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Alexander Korotkov c952eae52a Check for conflicting queries during replay of gistvacuumpage() 
013ebc0a7b implements so-called GiST microvacuum.  That is gistgettuple() marks
index tuples as dead when kill_prior_tuple is set.  Later, when new tuple
insertion claims page space, those dead index tuples are physically deleted
from page.  When this deletion is replayed on standby, it might conflict with
read-only queries.  But 013ebc0a7b doesn't handle this.  That may lead to
disappearance of some tuples from read-only snapshots on standby.

This commit implements resolving of conflicts between replay of GiST microvacuum
and standby queries.  On the master we implement new WAL record type
XLOG_GIST_DELETE, which comprises necessary information.  On stable releases
we've to be tricky to keep WAL compatibility.  Information required for conflict
processing is just appended to data of XLOG_GIST_PAGE_UPDATE record.  So,
PostgreSQL version, which doesn't know about conflict processing, will just
ignore that.

Reported-by: Andres Freund
Diagnosed-by: Andres Freund
Discussion: https://postgr.es/m/20181212224524.scafnlyjindmrbe6%40alap3.anarazel.de
Author: Alexander Korotkov
Backpatch-through: 9.6
 		2018-12-21 02:37:37 +03:00
config Update config/ax_pthread.m4 to latest upstream version. 2018-11-19 15:05:33 -05:00
contrib Update sepgsql regression test results for commit ca4103025. 2018-12-18 11:40:10 -05:00
doc Doc: fix ancient mistake in search_path documentation. 2018-12-20 13:55:11 -05:00
src Check for conflicting queries during replay of gistvacuumpage() 2018-12-21 02:37:37 +03:00
.dir-locals.el Update documentation editor setup instructions 2018-07-13 21:23:41 +02:00
.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 copyright for 2018 2018-01-02 23:30:12 -05:00
GNUmakefile.in Remove unwanted "garbage cleanup" logic in Makefiles. 2018-08-08 14:32:29 -04:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Fix non-GNU makefiles for AIX make. 2017-11-30 00:57:22 -08:00
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 Drop support for getting signal descriptions from sys_siglist[]. 2018-12-17 13:50:16 -05:00
configure.in Drop support for getting signal descriptions from sys_siglist[]. 2018-12-17 13:50:16 -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/.