PostgreSQL: Documentation: devel: F.11. dblink — connect to other PostgreSQL databases

Documentation → PostgreSQL devel (2025-04-29 03:39:37 - git commit 9807617a929)

Supported Versions: Current (17) / 16 / 15 / 14 / 13

Development Versions: devel

Unsupported versions: 12 / 11 / 10 / 9.6 / 9.5 / 9.4 / 9.3 / 9.2 / 9.1 / 9.0 / 8.4 / 8.3

This documentation is for an unsupported version of PostgreSQL.
You may want to view the same page for the current version, or one of the other supported versions listed above instead.

F.11. dblink — connect to other PostgreSQL databases
Prev	Up	Appendix F. Additional Supplied Modules and Extensions	Home	Next

F.11. dblink — connect to other PostgreSQL databases #

dblink_connect — opens a persistent connection to a remote database
dblink_connect_u — opens a persistent connection to a remote database, insecurely
dblink_disconnect — closes a persistent connection to a remote database
dblink — executes a query in a remote database
dblink_exec — executes a command in a remote database
dblink_open — opens a cursor in a remote database
dblink_fetch — returns rows from an open cursor in a remote database
dblink_close — closes a cursor in a remote database
dblink_get_connections — returns the names of all open named dblink connections
dblink_error_message — gets last error message on the named connection
dblink_send_query — sends an async query to a remote database
dblink_is_busy — checks if connection is busy with an async query
dblink_get_notify — retrieve async notifications on a connection
dblink_get_result — gets an async query result
dblink_cancel_query — cancels any active query on the named connection
dblink_get_pkey — returns the positions and field names of a relation's primary key fields
dblink_build_sql_insert — builds an INSERT statement using a local tuple, replacing the primary key field values with alternative supplied values
dblink_build_sql_delete — builds a DELETE statement using supplied values for primary key field values
dblink_build_sql_update — builds an UPDATE statement using a local tuple, replacing the primary key field values with alternative supplied values

dblink is a module that supports connections to other PostgreSQL databases from within a database session.

dblink can report the following wait events under the wait event type Extension.

DblinkConnect: Waiting to establish a connection to a remote server.
DblinkGetConnect: Waiting to establish a connection to a remote server when it could not be found in the list of already-opened connections.
DblinkGetResult: Waiting to receive the results of a query from a remote server.

See also postgres_fdw, which provides roughly the same functionality using a more modern and standards-compliant infrastructure.

Prev	Up	Next
F.10. cube — a multi-dimensional cube data type	Home	dblink_connect