Oracle - Listener

Examples:

-- SQL> ALTER SYSTEM SET service_names='svr_oracle_prd.com.br' SCOPE=MEMORY SID='orcl_prd';

-- SQL> show parameter service_names;

NAME     TYPE VALUE
------------------------------------ ----------- ------------------------------
service_names     string svr_oracle_prd.com.br




oracle@svr-oracle01 trace]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 28-NOV-2013 10:05:19

Copyright (c) 1991, 2011, Oracle.  All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date                27-NOV-2013 01:08:38
Uptime                    1 days 8 hr. 56 min. 40 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/grid/11.2.0/grid/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/svr-oracle01/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.20.57)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.20.21)(PORT=1521)))

Edit: 

vim | vi  $ORACLE_HOME/network/admin/tnsnames.ora

NAME_ALIAS_BASE =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = IP_BASE )(PORT = PORT_LISTENER ))
    (CONNECT_DATA =
    (SERVER = DEDICATED)
   (SERVICE_NAME = SERVICE_NAMES )
             )
    )