利用sql语句创建job

写了一段例子，通过sql创建一个job，定期执行一些清除工作。在sql2005上测试通过。
sql帮助文档太零散了。这是一个完整的流程。不过注意定时执行时需要sql server agent服务器启动的。
USE msdb ;
GO
EXEC dbo.sp_add_job
@job_name = N'Clear oldest HB',
@enabled = 1,
@description = N'Clear heartbeating data older than one month',
@notify_level_eventlog = 3;
GO
EXEC sp_add_jobstep
@job_name = N'Clear oldest HB',
@step_name = N'Clear Data',
@database_name = N'HINAMIIS',
@subsystem = N'TSQL',
@command = N'DELETE from dbo.JobTest WHERE DATEDIFF(DAY, dbo.JobTest.inserttime, GETDATE()) >=30',
@retry_attempts = 1,
@retry_interval = 5 ;
GO
EXEC sp_add_schedule
@schedule_name = N'WeeklyClearJobs' ,
@freq_type = 8,
@freq_interval = 1,
@freq_recurrence_factor = 1,
@active_start_time = 100000 ;
GO
EXEC sp_attach_schedule
@job_name = N'Clear oldest HB',
@schedule_name = N'WeeklyClearJobs' ;
GO
EXEC dbo.sp_add_jobserver
@job_name = N'Clear oldest HB'
GO