Oracle Database Discussions

Hi Sybrand,
thanks for your answer. But I can't get the listener name from listener.ora. This file looks like-

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = ARDHENDU-1C3844)(PORT = 1521))
)
)

and pls tell me how to know what listener is running, means the sql query.

thanks.