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Alvaro Herrera a85045cccb Make autovacuum more selective about temp tables to keep 
When temp tables are in danger of XID wraparound, autovacuum drops them;
however, it preserves those that are owned by a working session.  This
is desirable, except when the session is connected to a different
database (because the temp tables cannot be from that session), so make
it only keep the temp tables only if the backend is in the same database
as the temp tables.

This is not bulletproof: it fails to detect temp tables left by a
session whose backend ID is reused in the same database but the new
session does not use temp tables.  Commit 943576bddc fixes that case
too, for branches 11 and up (which is why we don't apply this fix to
those branches), but back-patching that one is not universally agreed
on.

Discussion: https://postgr.es/m/20181214162843.37g6h3txto43akrb@alvherre.pgsql
Reviewed-by: Takayuki Tsunakawa, Michaël Paquier
2018-12-27 16:00:39 -03:00
config Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:51 -05:00
contrib Fix hstore hash function for empty hstores upgraded from 8.4. 2018-11-24 21:17:09 +00:00
doc Doc: fix ancient mistake in search_path documentation. 2018-12-20 13:55:11 -05:00
src Make autovacuum more selective about temp tables to keep 2018-12-27 16:00:39 -03:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Add functions for dealing with PGP armor header lines to pgcrypto. 2014-10-01 16:03:39 +03:00
.gitignore Improve speed of make check-world 2015-04-23 08:59:52 -04:00
aclocal.m4 Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:51 -05:00
configure Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:51 -05:00
configure.in Back-patch updated thread flags tests into 9.4 and 9.5. 2018-11-19 14:24:51 -05:00
COPYRIGHT Update copyright for 2018 2018-01-02 23:30:12 -05:00
GNUmakefile.in Fix distclean/maintainer-clean targets to remove top-level tmp_install dir. 2015-05-13 18:48:05 -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 00:57:31 -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

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/.