postgresql

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Tom Lane 0d01c5b932 Fix postmaster's handling of a startup-process crash. Ordinarily, a failure (unexpected exit status) of the startup subprocess should be considered fatal, so the postmaster should just close up shop and quit. However, if we sent the startup process a SIGQUIT or SIGKILL signal, the failure is hardly "unexpected", and we should attempt restart; this is necessary for recovery from ordinary backend crashes in hot-standby scenarios. I attempted to implement the latter rule with a two-line patch in commit `442231d7f7`, but it now emerges that that patch was a few bricks shy of a load: it failed to distinguish the case of a signaled startup process from the case where the new startup process crashes before reaching database consistency. That resulted in infinitely respawning a new startup process only to have it crash again. To handle this properly, we really must track whether we have sent the current startup process a kill signal. Rather than add yet another ad-hoc boolean to the postmaster's state, I chose to unify this with the existing RecoveryError flag into an enum tracking the startup process's state. That seems more consistent with the postmaster's general state machine design. Back-patch to 9.0, like the previous patch.		2015-07-09 13:22:23 -04:00
config	Remove configure check prohibiting threaded libpython on OpenBSD.	2015-05-26 22:14:59 -04:00
contrib	Replace use of "diff -q".	2015-07-08 20:44:26 -04:00
doc	Fix another broken link in documentation.	2015-07-09 16:12:38 +03:00
src	Fix postmaster's handling of a startup-process crash.	2015-07-09 13:22:23 -04:00
.dir-locals.el	Update Emacs configuration	2013-08-13 20:08:44 -04:00
.gitattributes	gitattributes: Ignore time zone data files for whitespace checks	2014-07-22 00:12:28 -04:00
.gitignore	Add *.pot to .gitignore	2013-10-19 10:56:52 -04:00
aclocal.m4	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
configure	Make numeric form of PG version number readily available in Makefiles.	2015-07-05 12:01:01 -04:00
configure.in	Make numeric form of PG version number readily available in Makefiles.	2015-07-05 12:01:01 -04:00
COPYRIGHT	Update copyright for 2015	2015-01-06 11:43:46 -05:00
GNUmakefile.in	Add TAP tests for client programs	2014-04-14 21:33:46 -04:00
HISTORY	Improve text of stub HISTORY file.	2014-02-12 18:16:17 -05:00
Makefile	Allow make check in PL directories	2011-02-15 06:52:12 +02:00
README	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -05:00
README.git	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -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:

	http://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
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.