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48.23. 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 48-23. 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
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