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Updated on 2025-10-09 GMT+08:00
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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.

Table 1 PG_FOREIGN_DATA_WRAPPER columns

Name

Type

Reference

Description

OID

OID

N/A

Row identifier (hidden attribute; displayed only when explicitly selected)

fdwname

Name

N/A

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[]

N/A

Access permissions

fdwoptions

Text[]

N/A

Option used for foreign data wrappers. It is a keyword=value string.
Parent Topic: System Catalogs