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Tom Lane 217dc525c0 Fix oversight in EvalPlanQualFetch: after failing to lock a tuple because 
someone else has just updated it, we have to set priorXmax to that tuple's
xmax (ie, the XID of the other xact that updated it) before looping back to
examine the next tuple.  Obviously, the next tuple in the update chain should
have that XID as its xmin, not the same xmin as the preceding tuple that we
had been trying to lock.  The mismatch would cause the EvalPlanQual logic to
decide that the tuple chain ended in a deletion, when actually there was a
live tuple that should have been found.

I inserted this error when recently adding logic to EvalPlanQual to make it
lock tuples before returning them (as opposed to the old method in which the
lock would occur much later, causing a great deal of work to be wasted if we
only then discover someone else updated it).  Sigh.  Per today's report from
Takahiro Itagaki of inconsistent results during pgbench runs.
 		2010-01-08 02:44:00 +00:00
config Make configure check the version of Perl we're building with, and reject 2010-01-07 01:41:11 +00:00
contrib Add buffer access counters to pg_stat_statements. 2010-01-08 00:38:20 +00:00
doc Add buffer access counters to pg_stat_statements. 2010-01-08 00:38:20 +00:00
src Fix oversight in EvalPlanQualFetch: after failing to lock a tuple because 2010-01-08 02:44:00 +00:00
COPYRIGHT Update copyright for the year 2010. 2010-01-02 16:58:17 +00:00
GNUmakefile.in Build bzip2 tarball in dist target as well 2009-11-03 21:28:10 +00:00
Makefile Revert brainfart: Of course the wildcard only works in GNU make itself. 2009-12-23 19:42:15 +00:00
README Point to our download URL, rather than listing interface in the README 2008-05-06 22:02:12 +00:00
README.CVS Fix the makefiles to fail cleanly if Perl is needed but not present. This 2009-06-23 03:46:00 +00:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Fail in a nicer way if we have --with-perl and no Perl. 2010-01-07 03:24:57 +00:00
configure.in Fail in a nicer way if we have --with-perl and no Perl. 2010-01-07 03:24:57 +00:00

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.  Changes between all PostgreSQL releases are recorded in the
file HISTORY.  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/.