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Tom Lane 48c7d9f6ff Improve GIN indexscan cost estimation. 
The better estimate requires more statistics than we previously stored:
in particular, counts of "entry" versus "data" pages within the index,
as well as knowledge of the number of distinct key values.  We collect
this information during initial index build and update it during VACUUM,
storing the info in new fields on the index metapage.  No initdb is
required because these fields will read as zeroes in a pre-existing
index, and the new gincostestimate code is coded to behave (reasonably)
sanely if they are zeroes.

Teodor Sigaev, reviewed by Jan Urbanski, Tom Lane, and Itagaki Takahiro.
2010-10-17 20:52:32 -04:00
config Add/fix caching on some configure checks 2010-09-29 22:38:04 +03:00
contrib Fix sloppy usage of TRIGGER_FIRED_BEFORE/TRIGGER_FIRED_AFTER. 2010-10-08 13:27:31 -04:00
doc Document that translate() removes characters in "from" that don't have 2010-10-16 01:15:10 -03:00
src Improve GIN indexscan cost estimation. 2010-10-17 20:52:32 -04:00
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Add/fix caching on some configure checks 2010-09-29 22:38:04 +03:00
configure.in Add/fix caching on some configure checks 2010-09-29 22:38:04 +03:00
COPYRIGHT Update copyright for the year 2010. 2010-01-02 16:58:17 +00:00
GNUmakefile.in Rename README.CVS to README.git and change references in it. 2010-09-21 12:40:16 +02:00
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 Remove extra newlines at end and beginning of files, add missing newlines 2010-08-19 05:57:36 +00:00
README.git Trivial typo fix. 2010-09-21 14:16:00 -04:00

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/.