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Tom Lane 60690a6fe8 Make stats regression test robust in the face of parallel query. 
Historically, the wait_for_stats() function in this test has simply checked
for a report of an indexscan on tenk2, corresponding to the last command
issued before we expect stats updates to appear.  However, with parallel
query that indexscan could be done by a parallel worker that will emit
its stats counters to the collector before the session's main backend does
(a full second before, in fact, thanks to the "pg_sleep(1.0)" added by
commit 957d08c81f).  That leaves a sizable window in which an
autovacuum-triggered write of the stats files would present a state in
which the indexscan on tenk2 appears to have been done, but none of the
write updates performed by the test have been.  This is evidently the
explanation for intermittent failures seen by me and on buildfarm member
mandrill.

To fix, we should check separately for both the tenk2 seqscan and indexscan
counts, since those might be reported by different processes that could be
delayed arbitrarily on an overloaded test machine.  And we need to check
for at least one update-related count.  If we ever allow parallel workers
to do writes, this will get even more complicated ... but in view of all
the other hard problems that will entail, I don't feel a need to solve this
one today.

Per research by Rahila Syed and myself; part of this patch is Rahila's.
2016-03-04 16:20:49 -05:00
config Install our "missing" script where PGXS builds can find it. 2015-12-11 16:15:05 -05:00
contrib postgres_fdw: When sending ORDER BY, always include NULLS FIRST/LAST. 2016-03-04 11:37:42 -05:00
doc Improve support of Hunspell in ispell dictionary. 2016-03-04 20:08:47 +03:00
src Make stats regression test robust in the face of parallel query. 2016-03-04 16:20:49 -05:00
.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 Add .gitignore entries for AIX-specific intermediate build artifacts. 2015-07-08 20:44:22 -04:00
aclocal.m4 Replace our hacked version of ax_pthread.m4 with latest upstream version. 2015-07-08 20:36:06 +03:00
configure Add support for systemd service notifications 2016-02-02 21:04:29 -05:00
configure.in Add support for systemd service notifications 2016-02-02 21:04:29 -05:00
COPYRIGHT Update copyright for 2016 2016-01-02 13:33:40 -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 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/.