Dbms_Job problem...........urgent

Question

I have scheduled a job, which should get fired after every 10 sec. Code as follows:
SQL> begin
2 dbms_job.submit(:jobno,
3 'my_pgm;',
4 SYSDATE + 10/86400,
5 'SYSDATE + (10/86400)',
6 FALSE);
7 COMMIT;
8 end;
9 /
PL/SQL procedure successfully completed.
Problem here is : It does not get fired automatically after ever 10 sec. But if I execute explicitly i.e.
Execute Dbms_job.run(21); -- 21 is Job no for above scheduled job.
This was it works fine.
Additional info :
select last_date,last_sec ,NEXT_DATE,next_sec ,failures,broken from user_jobs
where job = 21;
Output is :
LAST_DATE LAST_SEC NEXT_DATE NEXT_SEC FAILURES B
04-MAR-2002 11:59:27 04-MAR-2002 11:59:37 0 N
Can anybody help me? Why it is not getting fired automatically? What should be done more?

Answer 1

An SNP process can run one job at a time with a maximum of ten SNP processes
running simultaneously. The INIT.ORA initialization file contains three
parameters that control the behavior of the SNP processes:
Parameters
JOB_QUEUE_PROCESSES
How many processes to start.
If set to zero, no jobs are executed.
Default is 0. Range is 0..10.
JOB_QUEUE_INTERVAL
How long an interval the process will sleep before checking for a new job.
Default is 60 sec. Range is 1..3600 sec.
JOB_QUEUE_KEEP_CONNECTIONS
Controls whether an SNP process closes any remote database connections. Default is False. Range is True/False.