CREATE ORACLE DATABASE SERVICES/SERVICE_NAME

dbms_service.create_service :  

We can call dbms_service.create_service procedure to create new service names , then start these service names for user connections. The procedure dbms_service.create_service requires the service name and service network name, use the service name to manage the service name. 

oracle@LINUX201:[~] $ sqlplus /"As sysdba"

SQL*Plus: Release 11.2.0.4.0 Production on Tue Apr 5 13:17:50 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select SERVICE_ID,name from V$SERVICES;

SERVICE_ID NAME
---------- ----------------------------------------------------------------
         4 ORCL
         1 SYS$BACKGROUND
         2 SYS$USERS

************************************************************

LEST CREATE A NEW DB SERVICE 

************************************************************

SAMPLE :

BEGIN

DBMS_SERVICE.CREATE_SERVICE(service_name=>'QPDEV',

 network_name=>'QPDEV.WORLD'); (or)  network_name=>'QPDEV');

 END;

 /


SQL> begin
 dbms_service.create_service('ORCLTEST','ORCLTEST');
end;
/

PL/SQL procedure successfully completed.

SQL> select SERVICE_ID,name from V$SERVICES;

SERVICE_ID NAME
---------- ----------------------------------------------------------------
         4 ORCL
         1 SYS$BACKGROUND
         2 SYS$USERS

SQL> begin
 DBMS_SERVICE.START_SERVICE('ORCL');
end;
/  2    3    4

PL/SQL procedure successfully completed.

************************************************************

CHECK IF THE SERVICE IS CREATED AND STARTED

************************************************************

SQL> select SERVICE_ID,name from V$SERVICES;

SERVICE_ID NAME
---------- ----------------------------------------------------------------
         7 ORCLTEST
         4 ORCL
         1 SYS$BACKGROUND
         2 SYS$USERS

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

oracle@LINUX201:[~] $ cd $ORACLE_HOME/network/admin

oracle@LINUX201:[/u01/app/oracle/product/11.2.0/db_1/network/admin] $ ls
samples  shrept.lst  tnsnames.ora

************************************************************

LETS ADD THIS NEW SERVICE IN TO TNSNAMES FILE:

************************************************************

oracle@LINUX201:[/u01/app/oracle/product/11.2.0/db_1/network/admin] $ vi tnsnames.ora
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/11.2/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = LINUX201.world.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = ORCLTEST)
    )
  )

************************************************************

LETS TEST IT :

************************************************************

oracle@LINUX201:[/u01/app/oracle/product/11.2.0/db_1/network/admin] $ tnsping ORCLTEST

TNS Ping Utility for Linux: Version 11.2.0.4.0 - Production on 05-APR-2016 13:21:31

Copyright (c) 1997, 2013, Oracle.  All rights reserved.

Used parameter files:


Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = LINUX201)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = ORCLTEST)))
OK (10 msec)
oracle@LINUX201:[/u01/app/oracle/product/11.2.0/db_1/network/admin] $ sqlplus atoorpu@ORCLTEST

SQL*Plus: Release 11.2.0.4.0 Production on Tue Apr 5 13:21:46 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Enter password:

You can also use more advanced features like failover parameters like below

Examples

DBMS_SERVICE.CREATE_SERVICE('ORCL','ORCL.WORLD');

DECLARE
   params dbms_service.svc_parameter_array;
   BEGIN
      params('FAILOVER_TYPE')            :='TRANSACTION';
      params('REPLAY_INITIATION_TIMEOUT'):=1800;
      params('RETENTION_TIMEOUT')        :=86400;
      params('FAILOVER_DELAY')           :=10;
      params('FAILOVER_RETRIES')         :=30;
      params('commit_outcome')           :='true';
      params('aq_ha_notifications')      :='true';
      DBMS_SERVICE.MODIFY_SERVICE('GOLD',params);
   END;