PostgreSQL: Documentation: 17: F.11. dblink — connect to other PostgreSQL databases

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

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