upstream/postgresql
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2026-04-20 22:00:13 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions
Base de données relationnelle
29500 commits 38 branches 679 tags 842 MiB
C 84.5%
PLpgSQL 6.1%
Perl 4.9%
Yacc 1.2%
Meson 0.7%
Other 2.4%
Find a file
Tom Lane 3f56ca1d49 Reduce the rescan cost estimate for Materialize nodes to cpu_operator_cost per 
tuple, instead of the former cpu_tuple_cost.  It is sane to charge less than
cpu_tuple_cost because Materialize never does any qual-checking or projection,
so it's got less overhead than most plan node types.  In particular, we want
to have the same charge here as is charged for readout in cost_sort.  That
avoids the problem recently exhibited by Teodor wherein the planner prefers
a useless sort over a materialize step in a context where a lot of rescanning
will happen.  The rescan costs should be just about the same for both node
types, so make their estimates the same.

Not back-patching because all of the current logic for rescan cost estimates
is new in 9.0.  The old handling of rescans is sufficiently not-sane that
changing this in that structure is a bit pointless, and might indeed cause
regressions.
2010-02-19 21:49:10 +00:00
config Support inlining various small performance-critical functions on non-GCC 2010-02-13 02:34:16 +00:00
contrib Stamp HEAD as 9.0devel, and update various places that were referring to 8.5 2010-02-17 04:19:41 +00:00
doc Revert version stamping in wrong branch 2010-02-19 18:42:30 +00:00
src Reduce the rescan cost estimate for Materialize nodes to cpu_operator_cost per 2010-02-19 21:49:10 +00:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Revert version stamping in wrong branch 2010-02-19 18:42:30 +00:00
configure.in Revert version stamping in wrong branch 2010-02-19 18:42:30 +00:00
COPYRIGHT Update copyright for the year 2010. 2010-01-02 16:58:17 +00:00
GNUmakefile.in Fix thinko in new installcheck-world target 2010-01-29 01:06:18 +00:00
Makefile Add new make targets "world", "install-world" and "installcheck-world" to build, install and check just about everything. 2010-01-28 23:59:52 +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

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/.