chain jobs not working properly

 Hi,

BEGIN

  DBMS_SCHEDULER.CREATE_PROGRAM (

   program_name           => 'p1',

   program_action         => '/home/oracle/p1.sh',

   program_type           => 'EXECUTABLE',

   comments               => 'My comments here');

END;

/

BEGIN

  DBMS_SCHEDULER.CREATE_PROGRAM (

   program_name           => 'p2',

   program_action         => '/home/oracle/p2.sh',

   program_type           => 'EXECUTABLE',

   comments               => 'My comments here');

END;

/

BEGIN

DBMS_SCHEDULER.CREATE_CHAIN (

   chain_name          => 'mychain',

   rule_set_name       => NULL,

   evaluation_interval => NULL,

   comments            => 'My first chain');

END;

/

BEGIN

  DBMS_SCHEDULER.DEFINE_CHAIN_STEP (

   chain_name      =>  'mychain',

   step_name       =>  'step1',

   program_name    =>  'p1');

  DBMS_SCHEDULER.DEFINE_CHAIN_STEP (

   chain_name      =>  'mychain',

   step_name       =>  'step2',

   program_name    =>  'p2');