PostgreSQL contrib modules and utilities

Find the list of controb modules and extensions included in Percona Distribution for PostgtreSQL.

Name	Database superuser	Description
adminpack	Required	Support toolpack for pgAdmin to provide additional functionality like remote management of server log files.
amcheck	Required	Provides functions to verify the logical consistency of the structure of indexes, such as B-trees. It’s useful for detecting system catalog corruption and index corruption.
auth_delay	Required	Causes the server to pause briefly before reporting authentication failure, to make brute-force attacks on database passwords more difficult.
auto_explain	Required	Automatically logs execution plans of slow SQL statements. It helps in performance analysis by tracking down un-optimized queries in large applications that exceed a specified time threshold.
basebackup_to_shell		Adds a custom basebackup target called shell. This enables an administartor to make a base backup of a running PostgreSQL server to a shell archive.
basic-archive	Required	An archive module that copies completed WAL segment files to the specified directory. Can be used as a starting point for developing own archive module.
bloom	Required	Provides an index access method based on Bloom filters. A Bloom filter is a space-efficient data structure that is used to test whether an element is a member of a set.
btree_gin	Required	Provides GIN index operator classes with B-tree-like behavior. This allows you to use GIN indexes, which are typically used for full-text search, in situations where you might otherwise use a B-tree index, such as with integer or text data.
btree_gist	Required	Provides GiST (Generalized Search Tree) index operator classes that implement B-tree-like behavior. This allows you to use GiST indexes, which are typically used for multidimensional and non-scalar data, in situations where you might otherwise use a B-tree index, such as with integer or text data.
citext		Provides a case-insensitive character string type, citext. Essentially, it internally calls lower when comparing values. Otherwise, it behaves almost exactly like text.
cube		Implements a data type cube for representing multidimensional cubes
dblink	Required	Provides functions to connect to other PostgreSQL databases from within a database session. This allows for queries to be run across multiple databases as if they were on the same server.
dict_int		An example of an add-on dictionary template for full-text search. It’s used to demonstrate how to create custom dictionaries in PostgreSQL.
dict_xsyn	Required	Example synonym full-text search dictionary. This dictionary type replaces words with groups of their synonyms, and so makes it possible to search for a word using any of its synonyms.
earthdistance	Required	This module provides two different approaches to calculating great circle distances on the surface of the Earth. The fisrt one depends on the cube module. The second one is based on the built-in point data type, using longitude and latitude for the coordinates.
hstore		Implements the hstore data type for storing sets of key/value pairs within a single PostgreSQL value.
intagg		Integer aggregator and enumerator.
intarray		Provides a number of useful functions and operators for manipulating null-free arrays of integers.
isn		Provides data types for the following international product numbering standards: EAN13, UPC, ISBN (books), ISMN (music), and ISSN (serials).
lo		Provides support for managing Large Objects (also called LOs or BLOBs). This includes a data type lo and a trigger lo_manage.
ltree		Implements a data type ltree for representing labels of data stored in a hierarchical tree-like structure. Extensive facilities for searching through label trees are provided.
oldsnapshot	Required	Allows inspection of the server state that is used to implement old_snapshot_threshold.
pageinspect	Required	Provides functions that allow you to inspect the contents of database pages at a low level, which is useful for debugging purposes.
passwordcheck		Checks users’ passwords whenever they are set with CREATE ROLE or ALTER ROLE. If a password is considered too weak, it will be rejected and the command will terminate with an error.
pg_buffercache	Required	Provides the set of functions for examining what’s happening in the shared buffer cache in real time.
pgcrypto	Required	Provides cryptographic functions for PostgreSQL.
pg_freespacemap	Required	Provides a means of examining the free space map (FSM), which PostgreSQL uses to track the locations of available space in tables and indexes. This can be useful for understanding space utilization and planning for maintenance operations.
pg_prewarm		Provides a convenient way to load relation data into either the operating system buffer cache or the PostgreSQL buffer cache. This can be useful for reducing the time needed for a newly started database to reach its full performance potential by preloading frequently accessed data.
pgrowlocks	Required	Provides a function to show row locking information for a specified table.
pg_stat_statements	Required	A module for tracking planning and execution statistics of all SQL statements executed by a server. Consider using an advanced version of pg_stat_statements - pg_stat_monitor
pgstattuple	Required	Povides various functions to obtain tuple-level statistics. It offers detailed information about tables and indexes, such as the amount of free space and the number of live and dead tuples.
pg_surgery	Required	Provides various functions to perform surgery on a damaged relation. These functions are unsafe by design and using them may corrupt (or further corrupt) your database. Use them with caution and only as a last resort
pg_trgm		Provides functions and operators for determining the similarity of alphanumeric text based on trigram matching. A trigram is a contiguous sequence of three characters. The extension can be used for text search and pattern matching operations.
pg_visibility	Required	Provides a way to examine the visibility map (VM) and the page-level visibility information of a table. It also provides functions to check the integrity of a visibility map and to force it to be rebuilt.
pg_walinspect	Required	Provides SQL functions that allow you to inspect the contents of write-ahead log of a running PostgreSQL database cluster at a low level, which is useful for debugging, analytical, reporting or educational purposes.
postgres_fdw	Required	Provides a Foreign Data Wrapper (FDW) for accessing data in remote PostgreSQL servers. It allows a PostgreSQL database to interact with remote tables as if they were local.
seg		Implements a data type seg for representing line segments, or floating point intervals. seg can represent uncertainty in the interval endpoints, making it especially useful for representing laboratory measurements.
segpgsql		SELinux-, label-based mandatory access control (MAC) security module. It can only be used on Linux 2.6.28 or higher with SELinux enabled.
spi	Required	Provides several workable examples of using the Server Programming Interface (SPI) and triggers.
sslinfo	Reqjuired	Provides information about the SSL certificate that the current client provided when connecting to PostgreSQL.
tablefunc		Includes various functions that return tables (that is, multiple rows). These functions are useful both in their own right and as examples of how to write C functions that return multiple rows.
tcn		Provides a trigger function that notifies listeners of changes to any table on which it is attached.
test_decoding	Required	An SQL-based test/example module for WAL logical decoding
tsm_system_rows		Provides the table sampling method SYSTEM_ROWS, which can be used in the TABLESAMPLE clause of a SELECT command.
tsm_system_time		Provides the table sampling method SYSTEM_TIME, which can be used in the TABLESAMPLE clause of a SELECT command.
unaccent		A text search dictionary that removes accents (diacritic signs) from lexemes. It’s a filtering dictionary, which means its output is always passed to the next dictionary (if any). This allows accent-insensitive processing for full text search.
uuid-ossp	Required	Provides functions to generate universally unique identifiers (UUIDs) using one of several standard algorithms
xml2	Required	Provides XPath querying and XSLT functionality. It allows for complex querying and transformation of XML data stored in PostgreSQL.

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