Listener.ora

From Oracle FAQ

Listener.ora is a SQL*Net configuration file used to configure Oracle Database Listeners (required to accept remote connection requests).

This file normally resides in the ORACLE HOME\NETWORK\ADMIN directory.

Example listener.ora file:

# listener.ora Network Configuration File: /app/oracle/product/10.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.

# SID_LIST_LISTENER =
#   (SID_LIST =
#     (SID_DESC =
#       (SID_NAME = PLSExtProc)
#       (ORACLE_HOME = /app/oracle/product/11.1.0/db_1)
#       (PROGRAM = extproc)
#     )
#   )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
  )