dbms_job.submit问题
SQL>    create   table   t1   (id   number);   
 Table   created.   
 SQL>    create   sequence   seq   start   with   1001   increment   by   1;   
 Sequence   created.   
 SQL>    insert   into   t1   values(seq.nextval);   
 1   row   created.   
 SQL>    commit;   
 Commit   complete.   
 SQL>    variable   n   number; 
 SQL>    begin 
 2   dbms_job.submit(:n, 'add_t1 ',sysdate, 'sysdate+1/1440/2 '); 
 3   commit; 
 4   end; 
 5   / 
 begin 
 * 
 ERROR   at   line   1:  
ORA-06550:   line   1,   column   100: 
 PLS-00103:   Encountered   the   symbol    "END "   when   expecting   one   of   the   following: 
 :=   .   (   @   %   ; 
 The   symbol    "; "   was   substituted   for    "END "   to   continue. 
 ORA-06512:   at    "SYS.DBMS_JOB ",   line   79 
 ORA-06512:   at    "SYS.DBMS_JOB ",   line   136 
 ORA-06512:   at   line   2 
 是什么错误   怎么解决啊   本人菜鸟   刚学   ....   
------解决方案--------------------dbms_job.submit(:n, 'add_t1 ',sysdate, 'sysdate+1/1440/2 ')   
 注意分号, 'add_t1; '
------解决方案--------------------BEGIN 
   VARIABLE n NUMBER; 
   dbms_job.submit(:n,  'add_t1 ', SYSDATE,  'sysdate+1/1440/2 '); 
   COMMIT; 
 END;
------解决方案--------------------http://www.bitscn.com/oracle/optimize/200604/19366.html