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.
pg_foreign_data_wrapper Columns
| Column Type | Description |
|---|---|
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; |
fdwoptions text[] | Foreign-data wrapper specific options, as “keyword=value” strings |