pg_foreign_data_wrapper
The system catalog table pg_foreign_data_wrapper stores foreign-data wrapper definitions. A foreign-data wrapper is a mechanism by which you access external data residing on foreign servers.
| column | type | references | description |
|---|---|---|---|
fdwname | name | Name of the foreign-data wrapper. | |
fdwowner | oid | pg_authid.oid | Owner of the foreign-data wrapper. |
fdwhandler | oid | pg_proc.oid | A reference to 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 | A reference to a validator function that is responsible for checking the validity of the options provided to the foreign-data wrapper. This function also checks the 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. |