Introduction
If you’re using an Oracle database, you may need to schedule jobs to run at specific times. One way to do this is by using the DBMS_JOB package. In this article, we’ll go over how to run DBMS_JOB in Oracle manually.
What is DBMS_JOB?
DBMS_JOB is an Oracle package that allows you to schedule jobs to run at specific times. These jobs can be anything from database maintenance tasks to data extraction and transformation processes.
Why Run DBMS_JOB Manually?
While you can use Oracle Enterprise Manager or other tools to schedule jobs, there may be times when you need more control over the scheduling process. Running DBMS_JOB manually gives you the flexibility to schedule jobs exactly when you need them.
Prerequisites
Before you can run DBMS_JOB manually, you’ll need to make sure that you have the necessary privileges. You’ll need the CREATE JOB and CREATE ANY JOB system privileges to create and manage jobs.
Step-by-Step Guide to Running DBMS_JOB Manually
Step 1: Create the Job
To create a job using DBMS_JOB, you’ll need to use the DBMS_JOB.SUBMIT procedure. Here’s an example:
DECLARE
jobno number;
BEGIN
dbms_job.submit(jobno, ‘my_job();’, sysdate, ‘sysdate+1/24’);
commit;
END;
This code creates a job that will run the “my_job” procedure at the current time and then every hour after that.
Step 2: Check the Job Status
Once you’ve created the job, you can check its status using the DBMS_JOB.BROKEN procedure. This procedure will return TRUE if the job has failed or FALSE if it’s still running.
DECLARE
jobno number;
is_broken boolean;
BEGIN
jobno := 1;
dbms_job.broken(jobno, is_broken);
if is_broken then
dbms_output.put_line(‘Job ‘ || jobno || ‘ is broken.’);
else
dbms_output.put_line(‘Job ‘ || jobno || ‘ is running.’);
end if;
END;
Step 3: Modify the Job
If you need to modify the job, you can use the DBMS_JOB.CHANGE procedure. This procedure allows you to change the job’s parameters or reschedule it.
DECLARE
jobno number;
BEGIN
jobno := 1;
dbms_job.change(jobno, ‘sysdate+2/24, my_job();’);
commit;
END;
This code changes the job to run two hours after the current time and then every hour after that.
Step 4: Remove the Job
To remove a job, you can use the DBMS_JOB.REMOVE procedure.
DECLARE
jobno number;
BEGIN
jobno := 1;
dbms_job.remove(jobno);
commit;
END;
Frequently Asked Questions
- What is DBMS_JOB?
- DBMS_JOB is an Oracle package that allows you to schedule jobs to run at specific times.
- What privileges do I need to use DBMS_JOB?
- You’ll need the CREATE JOB and CREATE ANY JOB system privileges to create and manage jobs.
- How do I create a job using DBMS_JOB?
- You can create a job using the DBMS_JOB.SUBMIT procedure.
- How do I check the status of a job?
- You can check the status of a job using the DBMS_JOB.BROKEN procedure.
- How do I modify a job?
- You can modify a job using the DBMS_JOB.CHANGE procedure.
- How do I remove a job?
- You can remove a job using the DBMS_JOB.REMOVE procedure.
Conclusion
Running DBMS_JOB manually gives you more control over the scheduling process in your Oracle database. With the steps and tips provided in this article, you’ll be able to create, manage, and modify jobs with ease. Remember to always check the status of your jobs and remove them when they’re no longer needed to keep your database running smoothly.
