如何在Oracle中建立作业

如何在Oracle中建立作业？好象在SQL Server中的作业那样。

------解决方法--------------------------------------------------------
下面是详细的使用job的实例：

SQL> create table a(a date);
Table created
创建一个过程
create or replace procedure kill_inactivate_SESSION is
cursor cur_session is
select s.sid, s.serial#
from v$session s, v$session_wait sw
where s.sid = sw.sid
and s.status = 'INACTIVE'
--and s.username in (select user_name from gusermgr.gbs_user_tbl)
and s.last_call_et >= 3600
and sw.event = 'SQL*Net message from client';
v_sid v$session.sid%type;
v_serial v$session.serial#%type;
v_sqlstr varchar2(63);
v_errmsg varchar2(63);
begin
v_sqlstr := 'alter system kill session ''';
v_errmsg := 'is killed because it is INACTIVE for longer than 1 hour.';
open cur_session;
loop
fetch cur_session into v_sid, v_serial;
exit when cur_session%NOTFOUND;
execute immediate v_sqlstr||v_sid||', '||v_serial||'''';
DBMS_OUTPUT.PUT_LINE('SESSION('||v_sid||', '||v_serial||') '||v_errmsg);
end loop;
close cur_session;
return;
end kill_inactivate_SESSION;

Procedure created


提交作业
SQL> variable n number;
SQL> begin
2 dbms_job.submit(:n,'kill_inactivate_session;',sysdate,'sysdate+1');
3 commit;
4 end;
5 /

PL/SQL procedure successfully completed
n
---------
514



运行作业
SQL> begin
2 dbms_job.run(514);
3 end;
4 /
PL/SQL procedure successfully completed
删除作业
SQL> begin
2 dbms_job.remove(514);
3 end;
4 /
PL/SQL procedure successfully completed
SQL> commit;
Commit complete

job change//修改作业
execute dbms_job.change(186,null,null,'sysdate+3');
execute dbms_job.change(186,'scott.test(update)');


Sysdate＋1/1440 ――每1分钟执行一次
Sysdate＋5/1440 ――每5分钟执行一次
trunc(sysdate+1)+2/24 ――下一天的2点（凌晨）执行一次
'SYSDATE + 7'
exactly seven days from the last execution
最后一次执行的7天之后执行
'SYSDATE + 1/48'
every half hour
每半个小时执行一次
'NEXT_DAY(TRUNC(SYSDATE),
''MONDAY'') + 15/24'
every Monday at 3PM
每个礼拜一的下午3点执行
'NEXT_DAY(ADD_MONTHS(TRUNC(SYSDATE, ''Q''), 3),
''THURSDAY'')'
first Thursday of each quarter 每个季度的第一个星期四