Jobs are not working/running .....

CBSDB1$ sqlplus /nolog

SQL*Plus: Release 11.2.0.3.0 Production on Tue Jul 28 23:06:10 2015

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

SQL> conn /as sysdba
Connected.
SQL> show parameter job_queue_processes

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
job_queue_processes                  integer     0
SQL> alter system set job_queue_processes=1000 scope=both;

System altered.

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
CBSDB1$