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Tom Lane 6f10eb2111 Refactor heap_page_prune so that instead of changing item states on-the-fly, 
it accumulates the set of changes to be made and then applies them.  It had
to accumulate the set of changes anyway to prepare a WAL record for the
pruning action, so this isn't an enormous change; the only new complexity is
to not doubly mark tuples that are visited twice in the scan.  The main
advantage is that we can substantially reduce the scope of the critical
section in which the changes are applied, thus avoiding PANIC in foreseeable
cases like running out of memory in inval.c.  A nice secondary advantage is
that it is now far clearer that WAL replay will actually do the same thing
that the original pruning did.

This commit doesn't do anything about the open problem that
CacheInvalidateHeapTuple doesn't have the right semantics for a CTID change
caused by collapsing out a redirect pointer.  But whatever we do about that,
it'll be a good idea to not do it inside a critical section.
2008-03-08 21:57:59 +00:00
config Backport fixed AC_FUNC_FSEEKO 2008-02-19 18:02:30 +00:00
contrib Replace time_t with pg_time_t (same values, but always int64) in on-disk 2008-02-17 02:09:32 +00:00
doc Add: 2008-03-08 17:57:21 +00:00
src Refactor heap_page_prune so that instead of changing item states on-the-fly, 2008-03-08 21:57:59 +00:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Use our own getopt() and getopt_long() on Solaris, because that platform's 2008-02-24 05:21:54 +00:00
configure.in Use our own getopt() and getopt_long() on Solaris, because that platform's 2008-02-24 05:21:54 +00:00
COPYRIGHT Update copyrights in source tree to 2008. 2008-01-01 19:46:01 +00:00
GNUmakefile.in Replace useless uses of := by = in makefiles. 2007-02-09 15:56:00 +00:00
Makefile Remove remains of old depend target. 2007-01-20 17:16:17 +00:00
README Update libpqxx URL in top-level README, per Gurjeet Singh. 2008-03-05 17:04:24 +00:00
README.CVS Some further editorializing on README.CVS. 2004-03-28 06:09:08 +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 including some of the more
common listed below:

C++ - http://pqxx.org/development/libpqxx/
JDBC - http://jdbc.postgresql.org
ODBC - http://odbc.postgresql.org
Perl - http://search.cpan.org/~dbdpg/
PHP - http://www.php.net
Python - http://www.initd.org/
Ruby - http://ruby.scripting.ca/postgres/

Other language binding are available from a variety of contributing
parties.

PostgreSQL also has a great number of procedural languages available,
a short, incomplete list is below:

PL/pgSQL - included in PostgreSQL source distribution
PL/Perl - included in PostgreSQL source distribution
PL/PHP - http://projects.commandprompt.com/projects/public/plphp
PL/Python - included in PostgreSQL source distribution
PL/Java - http://pgfoundry.org/projects/pljava/
PL/Tcl - included in PostgreSQL source distribution

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/.