PG_FOREIGN_DATA_WRAPPER¶
PG_FOREIGN_DATA_WRAPPER records foreign-data wrapper definitions. A foreign-data wrapper is the mechanism by which external data, residing on foreign servers, is accessed.
Name | Type | Reference | 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. Its value is 0 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. Its value is 0 if no validator is provided. |
fdwacl | aclitem[] |
| Access permissions |
fdwoptions | text[] |
| Option used for foreign data wrappers. It is a keyword=value string. |