Queue Concurrent Processing using PL/SQL notification

Question

I have a queue that I need to have the processing done concurrently no matter how many messages are in the queue.  Currently one 1 message is processed at a time, but I need at least 10 processed at once.  Each message could take up to 3 minutes to process so doing one at a time is taking too long when the number of messages grows to more than 5 or 10.  How can this be done?
begin
  DBMS_AQADM.CREATE_QUEUE_TABLE
  ( queue_table => 'z3.health_check_qtab',
    queue_payload_type =>  'z3.sil_queue_msg_typ',
    multiple_consumers => TRUE );
  DBMS_AQADM.CREATE_QUEUE
  ( queue_name => 'HEALTH_CHECK_Q',
    queue_table => 'z3.health_check_qtab');
  DBMS_AQADM.START_QUEUE
  (  queue_name => 'HEALTH_CHECK_Q');
end;
begin
  dbms_aqadm.add_subscriber
  ( queue_name => 'Z3.HEALTH_CHECK_Q',
    subscriber => sys.aq$_agent( 'HC_recipient1', null, null ) );
end;
BEGIN
  dbms_aq.register
  ( sys.aq$_reg_info_list(
    sys.aq$_reg_info('Z3.HEALTH_CHECK_Q:HC_RECIPIENT1',
                     DBMS_AQ.NAMESPACE_AQ,
                    'plsql://Z3.Z_IMPACT_LIST_PKG.DEQUEUE_HEALTH_CHECK',
                    HEXTORAW('FF')) ) ,
  1 );
end;
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

Answer 1

I'm also looking into how to do this (on 10gR2 RAC). I would like to enqueue say 1,000,000 requests and have 10-30 (configurable) worker 'threads' dequeueing and executing a PL/SQL procedure during certain parts of the day.