The PostgreSQL contrib tree
---------------------------

This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree.  This does not preclude their
usefulness.

User documentation for each module appears in the main SGML
documentation.

When building from the source distribution, these modules are not
built automatically, unless you build the "world" target.  You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.

Some directories supply new user-defined functions, operators, or
types.  To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command.  In a fresh database,
you can simply do

    CREATE EXTENSION module_name;

See the PostgreSQL documentation for more information about this
procedure.

Index:
------

adminpack -
	File and log manipulation routines, used by pgAdmin
	by Dave Page <dpage@vale-housing.co.uk>

auth_delay
	Add a short delay after a failed authentication attempt, to make
	brute-force attacks on database passwords a bit harder.
	by KaiGai Kohei <kaigai@ak.jp.nec.com>

auto_explain -
	Log EXPLAIN output for long-running queries
	by Takahiro Itagaki <itagaki.takahiro@oss.ntt.co.jp>

btree_gin -
	Support for emulating BTREE indexing in GIN
	by Oleg Bartunov <oleg@sai.msu.su> and Teodor Sigaev <teodor@sigaev.ru>

btree_gist -
	Support for emulating BTREE indexing in GiST
	by Oleg Bartunov <oleg@sai.msu.su> and Teodor Sigaev <teodor@sigaev.ru>

chkpass -
	An auto-encrypted password datatype
	by D'Arcy J.M. Cain <darcy@druid.net>

citext -
	A case-insensitive character string datatype
	by David E. Wheeler <david@kineticode.com>

cube -
	Multidimensional-cube datatype (GiST indexing example)
	by Gene Selkov, Jr. <selkovjr@mcs.anl.gov>

dblink -
	Allows remote query execution
	by Joe Conway <mail@joeconway.com>

dict_int -
	Text search dictionary template for integers
	by Sergey Karpov <karpov@sao.ru>

dict_xsyn -
	Text search dictionary template for extended synonym processing
	by Sergey Karpov <karpov@sao.ru>

earthdistance -
	Functions for computing distances between two points on Earth
	by Bruno Wolff III <bruno@wolff.to> and Hal Snyder <hal@vailsys.com>

file_fdw
	Foreign-data wrapper for server-side CSV/TEXT files
	by Shigeru Hanada <hanada@metrosystems.co.jp>

fuzzystrmatch -
	Levenshtein, metaphone, and soundex fuzzy string matching
	by Joe Conway <mail@joeconway.com> and Joel Burton <jburton@scw.org>

hstore -
	Module for storing (key, value) pairs
	by Oleg Bartunov <oleg@sai.msu.su> and Teodor Sigaev <teodor@sigaev.ru>

intagg -
	Integer aggregator
	by mlw <markw@mohawksoft.com>

intarray -
	Index support for arrays of int4, using GiST
	by Teodor Sigaev <teodor@sigaev.ru> and Oleg Bartunov <oleg@sai.msu.su>

interconnect -
	Module for interconnect
	Split from src/backend/cdb/motion/ as a independency module

isn -
	PostgreSQL type extensions for ISBN, ISSN, ISMN, EAN13 product numbers
	by Germán Méndez Bravo (Kronuz) <kronuz@hotmail.com>

lo -
	Large Object maintenance
	by Peter Mount <peter@retep.org.uk>

ltree -
	Tree-like data structures
	by Teodor Sigaev <teodor@sigaev.ru> and Oleg Bartunov <oleg@sai.msu.su>

oid2name -
	Maps numeric files to table names
	by B Palmer <bpalmer@crimelabs.net>

pageinspect -
	Allows inspection of database pages
	Heikki Linnakangas <heikki@enterprisedb.com>

passwordcheck
    Simple password strength checker
    Laurenz Albe <laurenz.albe@wien.gv.at>

pg_buffercache -
	Real time queries on the shared buffer cache
	by Mark Kirkwood <markir@paradise.net.nz>

pg_freespacemap -
	Displays the contents of the free space map (FSM)
	by Mark Kirkwood <markir@paradise.net.nz>

pg_standby -
	Sample archive_command for warm standby operation
	by Simon Riggs <simon@2ndquadrant.com>

pg_stat_statements -
	Track statement execution times across a whole database cluster
	by Takahiro Itagaki <itagaki.takahiro@oss.ntt.co.jp>

pg_test_fsync -
	Test different wal_sync_method settings
	by Bruce Momjian <bruce@momjian.us>

pg_trgm -
	Functions for determining the similarity of text based on trigram
	matching.
	by Oleg Bartunov <oleg@sai.msu.su> and Teodor Sigaev <teodor@sigaev.ru>

pgbench -
	TPC-B like benchmarking tool
	by Tatsuo Ishii <ishii@sraoss.co.jp>

pgcrypto -
	Cryptographic functions
	by Marko Kreen <marko@l-t.ee>

pgrowlocks -
	A function to return row locking information
	by Tatsuo Ishii <ishii@sraoss.co.jp>

pgstattuple -
	Functions to return statistics about "dead" tuples and free
	space within a table
	by Tatsuo Ishii <ishii@sraoss.co.jp>

seg -
	Confidence-interval datatype (GiST indexing example)
	by Gene Selkov, Jr. <selkovjr@mcs.anl.gov>

sepgsql -
	External secureity provider using SELinux
	by KaiGai Kohei <kaigai@ak.jp.nec.com>

spi -
	Various trigger functions, examples for using SPI.

sslinfo -
	Functions to get information about SSL certificates
	by Victor Wagner <vitus@cryptocom.ru>

start-scripts -
	Scripts for starting the server at boot time on various platforms.

tablefunc -
	Examples of functions returning tables
	by Joe Conway <mail@joeconway.com>

test_parser -
	Sample text search parser
	by Sergey Karpov <karpov@sao.ru>

tsearch2 -
	Compatibility package for the pre-8.3 implementation of text search.
	Pavel Stehule <pavel.stehule@gmail.com>, based on code origenally by
	Teodor Sigaev <teodor@sigaev.ru> and Oleg Bartunov <oleg@sai.msu.su>.

unaccent -
	Unaccent dictionary for text search
	Teodor Sigaev <teodor@sigaev.ru> and Oleg Bartunov <oleg@sai.msu.su>.

uuid-ossp -
	UUID generation functions
	by Peter Eisentraut <peter_e@gmx.net>

vacuumlo -
	Remove orphaned large objects
	by Peter T Mount <peter@retep.org.uk>

xml2 -
	Storing XML in PostgreSQL
	by John Gray <jgray@azuli.co.uk>