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Windows Oracle Job Schedulers examples

Oracle Database Tips by Donald Burleson

Oracle Windows Job Schedulers examples


The AT command can be used to schedule commands and programs on Windows NT, Windows 2000, Windows XP and Windows 2003.  For the command to work, the scheduler service must be running.  On Windows 2000, this can be done using the services dialog (Start Programs Administrative Tools Services) or from the command line using the net command:

net stop "Task Scheduler"
net start "Task Scheduler"

The at /? command produces the following:

AT [\\computername] [ [id] [/DELETE] | /DELETE [/YES]]
AT [\\computername] time [/INTERACTIVE]
    [ /EVERY:date[,...] | /NEXT:date[,...]] "command"
\\computername     Specifies a remote computer. Commands are scheduled on the
                   local computer if this parameter is omitted.
id                 Is an identification number assigned to a scheduled
/delete            Cancels a scheduled command. If id is omitted, all the
                   scheduled commands on the computer are canceled.
/yes               Used with cancel all jobs command when no further
                   confirmation is desired.
time               Specifies the time when command is to run.
/interactive       Allows the job to interact with the desktop of the user
                   who is logged on at the time the job runs.
/every:date[,...]  Runs the command on each specified day(s) of the week or
                   month. If date is omitted, the current day of the month
                   is assumed.
/next:date[,...]   Runs the specified command on the next occurrence of the
                   day (for example, next Thursday).  If date is omitted, the
                   current day of the month is assumed.
"command"          Is the Windows NT command, or batch program to be run.


A couple of simple examples of its use include:

C:> at 21:00 /every:m,t,th,f "c:\jobs\MyJob.bat"
Added a new job with job ID = 1
C:> at 6:00 /next:20 "c:\jobs\MyJob.bat"
Added a new job with job ID = 2


The first example schedules a job which runs the c:\jobs\MyJob.bat script at 9:00 p.m. on Mondays, Tuesdays, Thursdays and Fridays.  The second example schedules a job that runs the script at 6:00 a.m. on the next 20th of the month.

The current list of jobs can be displayed by issuing the at command with no parameters:


Status ID   Day                     Time          Command Line
        1   Each M T Th F           21:00 PM      c:\jobs\MyJob.bat
        2   Next 20                 06:00 AM      c:\jobs\MyJob.bat
Jobs can be deleted using the /delete option:
C:\>at 1 /delete
C:\>at 2 /delete
There are no entries in the list.

The AT scheduler has been at the heart of Windows scheduling for some years, but recent Windows versions have introduced simpler and more flexible alternatives, which will be covered in the following section.

For more details, see the book Oracle Job Scheduling: Creating robust task management with dbms_job and Oracle 10g  dbms_scheduler, by Dr. Timothy Hall



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