Appendix F. Additional Supplied Modules
Table of Contents
- F.1. adminpack
- F.2. amcheck
- F.3. auth_delay
- F.4. auto_explain
- F.5. bloom
- F.6. btree_gin
- F.7. btree_gist
- F.8. chkpass
- F.9. citext
- F.10. cube
- F.11. dblink
-
- dblink_connect - opens a persistent connection to a remote database
- dblink_connect_u - opens a persistent connection to a remote database, insecurely
- dblink_disconnect - closes a persistent connection to a remote database
- dblink - executes a query in a remote database
- dblink_exec - executes a command in a remote database
- dblink_open - opens a cursor in a remote database
- dblink_fetch - returns rows from an open cursor in a remote database
- dblink_close - closes a cursor in a remote database
- dblink_get_connections - returns the names of all open named dblink connections
- dblink_error_message - gets last error message on the named connection
- dblink_send_query - sends an async query to a remote database
- dblink_is_busy - checks if connection is busy with an async query
- dblink_get_notify - retrieve async notifications on a connection
- dblink_get_result - gets an async query result
- dblink_cancel_query - cancels any active query on the named connection
- dblink_get_pkey - returns the positions and field names of a relation's primary key fields
- dblink_build_sql_insert - builds an INSERT statement using a local tuple, replacing the primary key field values with alternative supplied values
- dblink_build_sql_delete - builds a DELETE statement using supplied values for primary key field values
- dblink_build_sql_update - builds an UPDATE statement using a local tuple, replacing the primary key field values with alternative supplied values
- F.12. dict_int
- F.13. dict_xsyn
- F.14. earthdistance
- F.15. file_fdw
- F.16. fuzzystrmatch
- F.17. hstore
- F.18. intagg
- F.19. intarray
- F.20. isn
- F.21. lo
- F.22. ltree
- F.23. pageinspect
- F.24. passwordcheck
- F.25. pg_buffercache
- F.26. pgcrypto
- F.27. pg_freespacemap
- F.28. pg_prewarm
- F.29. pgrowlocks
- F.30. pg_stat_statements
- F.31. pgstattuple
- F.32. pg_trgm
- F.33. pg_visibility
- F.34. postgres_fdw
- F.35. seg
- F.36. sepgsql
- F.37. spi
-
- F.37.1. refint - Functions for Implementing Referential Integrity
- F.37.2. timetravel - Functions for Implementing Time Travel
- F.37.3. autoinc - Functions for Autoincrementing Fields
- F.37.4. insert_username - Functions for Tracking Who Changed a Table
- F.37.5. moddatetime - Functions for Tracking Last Modification Time
- F.38. sslinfo
- F.39. tablefunc
- F.40. tcn
- F.41. test_decoding
- F.42. tsm_system_rows
- F.43. tsm_system_time
- F.44. unaccent
- F.45. uuid-ossp
- F.46. xml2
This appendix and the next one contain information regarding the modules that
can be found in the
contrib
directory of the
PostgreSQL
distribution.
These include 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.
This appendix covers extensions and other server plug-in modules found in
contrib
.
Appendix G
covers utility
programs.
When building from the source distribution, these components are not built automatically, unless you build the "world" target (see Step 2 ). You can build and install all of them by running:
makemake install
in the
contrib
directory of a configured source tree;
or to build and install
just one selected module, do the same in that module's subdirectory.
Many of the modules have regression tests, which can be executed by
running:
make checkbefore installation or
make installcheckonce you have a PostgreSQL server running.
If you are using a pre-packaged version of
PostgreSQL
,
these modules are typically made available as a separate subpackage,
such as
postgresql-contrib
.
Many modules 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. In PostgreSQL 9.1 and later, this is done by executing a CREATE EXTENSION command. In a fresh database, you can simply do
CREATE EXTENSION module_name;
This command must be run by a database superuser. This registers the
new SQL objects in the current database only, so you need to run this
command in each database that you want
the module's facilities to be available in. Alternatively, run it in
database
template1
so that the extension will be copied into
subsequently-created databases by default.
Many modules allow you to install their objects in a schema of your
choice. To do that, add
SCHEMA
to the
schema_name
CREATE EXTENSION
command. By default, the objects will be placed in your current creation
target schema, which in turn defaults to
public
.
If your database was brought forward by dump and reload from a pre-9.1 version of PostgreSQL , and you had been using the pre-9.1 version of the module in it, you should instead do
CREATE EXTENSION module_name FROM unpackaged;
This will update the pre-9.1 objects of the module into a proper extension object. Future updates to the module will be managed by ALTER EXTENSION . For more information about extension updates, see Section 37.15 .
Note, however, that some of these modules are not " extensions " in this sense, but are loaded into the server in some other way, for instance by way of shared_preload_libraries . See the documentation of each module for details.