dblink_send_query sends a query to be executed
asynchronously, that is, without immediately waiting for the result.
There must not be an async query already in progress on the
After successfully dispatching an async query, completion status
can be checked with
dblink_is_busy, and the results
are ultimately collected with
It is also possible to attempt to cancel an active async query
Name of the connection to use.
The SQL statement that you wish to execute in the remote database, for example select * from pg_class.