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Andres Freund fc02e6724f Fix race condition between relation extension and vacuum. In `e6799d5a53` I removed vacuumlazy.c trickery around re-checking whether a page is actually empty after acquiring an extension lock on the relation, because the page is not PageInit()ed anymore, and entries in the FSM ought not to lead to user-visible errors. As reported by various buildfarm animals that is not correct, given the way to code currently stands: If vacuum processes a page that's just been newly added by either RelationGetBufferForTuple() or RelationAddExtraBlocks(), it could add that page to the FSM and it could be reused by other backends, before those two functions check whether the newly added page is actually new. That's a relatively narrow race, but several buildfarm machines appear to be able to hit it. While it seems wrong that the FSM, given it's lack of durability and approximative nature, can trigger errors like this, that seems better fixed in a separate commit. Especially given that a good portion of the buildfarm is red, and this is just re-introducing logic that existed a few hours ago. Author: Andres Freund Discussion: https://postgr.es/m/20190128222259.zhi7ovzgtkft6em6@alap3.anarazel.de		2019-01-28 15:44:12 -08:00
config	configure: More use of AC_ARG_VAR	2019-01-18 08:38:34 +01:00
contrib	In the planner, replace an empty FROM clause with a dummy RTE.	2019-01-28 17:54:23 -05:00
doc	doc: Add link from sslinfo to pg_stat_ssl	2019-01-28 14:41:38 +01:00
src	Fix race condition between relation extension and vacuum.	2019-01-28 15:44:12 -08:00
.dir-locals.el	Make Emacs perl-mode indent more like perltidy.	2019-01-13 11:32:31 -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 copyright for 2019	2019-01-02 12:44:25 -05:00
GNUmakefile.in	Process EXTRA_INSTALL serially, during the first temp-install.	2018-12-31 13:54:38 -08:00
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	Second try at fixing ecpglib thread-safety problem.	2019-01-21 16:17:10 -05:00
configure.in	Second try at fixing ecpglib thread-safety problem.	2019-01-21 16:17:10 -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/.