11th October 2018: PostgreSQL 11 RC 1 Released!
Supported Versions: Current (10) / 9.6 / 9.5 / 9.4 / 9.3
Development Versions: 11 / devel
Unsupported versions: 9.2 / 9.1 / 9.0 / 8.4

52.23. pg_foreign_data_wrapper

The catalog pg_foreign_data_wrapper stores foreign-data wrapper definitions. A foreign-data wrapper is the mechanism by which external data, residing on foreign servers, is accessed.

Table 52.23. pg_foreign_data_wrapper Columns

Name Type References Description
oid oid   Row identifier (hidden attribute; must be explicitly selected)
fdwname name   Name of the foreign-data wrapper
fdwowner oid pg_authid.oid Owner of the foreign-data wrapper
fdwhandler oid pg_proc.oid References a handler function that is responsible for supplying execution routines for the foreign-data wrapper. Zero if no handler is provided
fdwvalidator oid pg_proc.oid References a validator function that is responsible for checking the validity of the options given to the foreign-data wrapper, as well as options for foreign servers and user mappings using the foreign-data wrapper. Zero if no validator is provided
fdwacl aclitem[]   Access privileges; see GRANT and REVOKE for details
fdwoptions text[]   Foreign-data wrapper specific options, as keyword=value strings