SQL & PL/SQL

I have stored procedure called “extract_every_day”, I want this procedure to run automatically at 7:00 PM every day.

I used DBMS_JOB.SUBMIT to achieve this, below is pl/sql block

DECLARE
v_jobno number ;
BEGIN
DBMS_JOB.SUBMIT
(v_jobno,
' extract_every_day ',
TRUNC (SYSDATE) + 1 + 9/24,
'TRUNC (SYSDATE) + 1 + 9/24');
COMMIT;
END;
/

When I run above pl/sql block is that mean procedure “extract_every_day” executes every day and what is the significance of “job” OUT parameter in “DBMS_JOB.SUBMIT “ procedure. Also how can I see list of jobs submitted.

Any help is appreciated.

Thanks