Why job queue can't start?

Question

DB: Oracle 9i Enterprise Edition Release 9.2.0.5.0
Platform: Windows 2003 Server
I imported several job queues from another oracle DB, after submit them, it seems everything is ok. But it can't start automatically upon reach time. (Should be run every 2 minutes)
I check the dba_jobs view, BROKEN = N, INTERVAL = ‘sysdate + 2/60/24’,FAILUERS=0. And I can successfully execute the job by DBMS_JOB.RUN(job_no), but it won't start again after next time reach.
CONNECT, RESOURCE and SELECT_CATALOG_ROLE privilege were granted to job owner, and JOB_QUEUE_PROCESSES parameter was set to 10. JOB_QUEUE_INTERVAL wasn't set in init.ora file.
no relative error was found in alter.log file.
Thanks.

Answer 1

even there's no job runing you should still see this process after you set
JOB_QUEUE_PROCESSES
if you select from v$process you should see some process like this
oracle@yourhost (J000)
I don't have a Window platform to test this, because in windows Oracle is threaded instead of having seperate processes
How Jobs Execute
Jnnn processes execute jobs. To execute a job, the process creates a session to run the job. When a Jnnn process runs a job, the job is run in the same environment in which it was submitted and with the owner's default privileges. The owner must be explicitly granted the necessary object privileges for all objects referenced within the job definition.
When you force a job to run using the procedure DBMS_JOB.RUN, the job is run by your user process and with your default privileges only. Privileges granted to you through roles are unavailable. You must be explicitly granted the necessary object privileges for all objects referenced within the job definition.
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96521/jobq.htm#991