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PostgreSQL extensions

Enabling extensions

  1. Enable the root user.
  2. Log in to the database as root.
  3. Use the following command to enable extensions: 
    CREATE EXTENSION $EXTENSION_NAME ;
  4. Disable root once you're done enabling extensions.

Currently available extensions

If there are extensions missing here that you would like to see available in Pukki, please contact the CSC Service Desk. Note that the extension list is based on the latest PostgreSQL version, the available extensions might differ in older versions.

Extension name Extension description
address_standardizer Used to parse an address into constituent elements. Generally used to support geocoding address normalization step.
address_standardizer-3 Used to parse an address into constituent elements. Generally used to support geocoding address normalization step.
address_standardizer_data_us Address Standardizer US dataset example
address_standardizer_data_us-3 Address Standardizer US dataset example
amcheck functions for verifying relation integrity
autoinc functions for autoincrementing fields
bloom bloom access method - signature file based index
btree_gin support for indexing common datatypes in GIN
btree_gist support for indexing common datatypes in GiST
citext data type for case-insensitive character strings
cube data type for multidimensional cubes
dblink connect to other PostgreSQL databases from within a database
dict_int text search dictionary template for integers
dict_xsyn text search dictionary template for extended synonym processing
earthdistance calculate great-circle distances on the surface of the Earth
file_fdw foreign-data wrapper for flat file access
fuzzystrmatch determine similarities and distance between strings
h3 H3 bindings for PostgreSQL
h3_postgis H3 PostGIS integration
hstore data type for storing sets of (key, value) pairs
insert_username functions for tracking who changed a table
intagg integer aggregator and enumerator (obsolete)
intarray functions, operators, and index support for 1-D arrays of integers
isn data types for international product numbering standards
lo Large Object maintenance
ltree data type for hierarchical tree-like structures
moddatetime functions for tracking last modification time
pageinspect inspect the contents of database pages at a low level
pg_buffercache examine the shared buffer cache
pg_freespacemap examine the free space map (FSM)
pg_prewarm prewarm relation data
pg_stat_statements track planning and execution statistics of all SQL statements executed
pg_surgery extension to perform surgery on a damaged relation
pg_trgm text similarity measurement and index searching based on trigrams
pg_visibility examine the visibility map (VM) and page-level visibility info
pg_walinspect functions to inspect contents of PostgreSQL Write-Ahead Log
pgcrypto cryptographic functions
pgrowlocks show row-level locking information
pgstattuple show tuple-level statistics
plpgsql PL/pgSQL procedural language
postgis PostGIS geometry and geography spatial types and functions
postgis-3 PostGIS geometry and geography spatial types and functions
postgis_raster PostGIS raster types and functions
postgis_raster-3 PostGIS raster types and functions
postgis_sfcgal PostGIS SFCGAL functions
postgis_sfcgal-3 PostGIS SFCGAL functions
postgis_tiger_geocoder PostGIS tiger geocoder and reverse geocoder
postgis_tiger_geocoder-3 PostGIS tiger geocoder and reverse geocoder
postgis_topology PostGIS topology spatial types and functions
postgis_topology-3 PostGIS topology spatial types and functions
postgres_fdw foreign-data wrapper for remote PostgreSQL servers
refint functions for implementing referential integrity (obsolete)
seg data type for representing line segments or floating-point intervals
sslinfo information about SSL certificates
tablefunc functions that manipulate whole tables, including crosstab
tcn Triggered change notifications
tsm_system_rows TABLESAMPLE method which accepts number of rows as a limit
tsm_system_time TABLESAMPLE method which accepts time in milliseconds as a limit
unaccent text search dictionary that removes accents
uuid-ossp generate universally unique identifiers (UUIDs)
xml2 XPath querying and XSLT

Parameters that users can modify

The DBaaS allows users to modify some of the parameters. If there are some parameters that you think you should be able to modify, please contact us and we'll see if we can make it possible. By default, we assume that default parameters are sane and that users should not, under normal circumstances, modify any of these parameters.

Parameters Default Requires restart Comments
maintenance_work_mem 64MB No
max_connections 100 Yes It is usually recommended to use connection pools instead of modifying this value
work_mem 4MB No
log_statement false No This is useful if you want to figure out more how your database is utilized
log_statement_stats false No This will also collect stats from your database, this is recommended to keep as false since it might affect performance

Some useful commands

List available extensions

SELECT name, default_version, comment FROM pg_available_extensions ORDER BY name;

List enabled extensions

SELECT * from pg_extension ORDER BY extname;

Create extension

CREATE EXTENSION ${EXTENSION_NAME};

Disable extension 

SELECT * FROM table1 LIMIT 1 \gx