Provided by: postgresql-doc-10_10.23-0ubuntu0.18.04.2_all 

NAME
dblink_disconnect - closes a persistent connection to a remote database
SYNOPSIS
dblink_disconnect() returns text
dblink_disconnect(text connname) returns text
DESCRIPTION
dblink_disconnect() closes a connection previously opened by dblink_connect(). The form with no arguments
closes an unnamed connection.
ARGUMENTS
connname
The name of a named connection to be closed.
RETURN VALUE
Returns status, which is always OK (since any error causes the function to throw an error instead of
returning).
EXAMPLES
SELECT dblink_disconnect();
dblink_disconnect
-------------------
OK
(1 row)
SELECT dblink_disconnect('myconn');
dblink_disconnect
-------------------
OK
(1 row)
PostgreSQL 10.23 2022 DBLINK_DISCONNECT(3)