51.23. 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 51.23. pg_foreign_data_wrapper Columns

Column Type


oid oid

Row identifier

fdwname name

Name of the foreign-data wrapper

fdwowner oid (references pg_authid.oid)

Owner of the foreign-data wrapper

fdwhandler oid (references 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 (references 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 Section 5.7 for details

fdwoptions text[]

Foreign-data wrapper specific options, as keyword=value strings