\dx
                                    List of installed extensions
      Name       | Version |   Schema   |                        Description                         
-----------------+---------+------------+------------------------------------------------------------
 dist_fdw        | 1.0     | pg_catalog | foreign-data wrapper for distfs access
 file_fdw        | 1.0     | pg_catalog | foreign-data wrapper for flat file access
 gms_tcp         | 1.0     | public     | provides TCP/IP client=side access functionality in PL/SQL
 hstore          | 1.1     | pg_catalog | data type for storing sets of (key, value) pairs
 log_fdw         | 1.0     | pg_catalog | Foreign Data Wrapper for accessing logging data
 plpgsql         | 1.0     | pg_catalog | PL/pgSQL procedural language
 security_plugin | 1.0     | pg_catalog | provides security functionality
(7 rows)