Oracle Job Scheduler: Integrate Oracle Database with Redwood

Yes, Oracle provides a native job scheduling feature called Oracle Scheduler. Oracle Scheduler is a job scheduling system within the Oracle database that automates tasks and programs. Oracle Scheduler has a robust and flexible framework for creating, scheduling, and managing jobs and job chains.

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In Oracle, the scheduler_jobs table is not a standard Oracle database object. However, there is a similar object called dba_scheduler_jobs.

The dba_scheduler_jobs view contains job details like job name, job type, job actions, job schedules, and job status. DBAs can query and monitor jobs from this view for better database administration.

Some important columns in the dba_scheduler_jobs view include:

• JOB_NAME
• JOB_TYPE
• JOB_ACTION
• START_DATE
• END_DATE
• SCHEDULE_NAME
• REPEAT_INTERVAL
• JOB_CLASS

Job type can include PLSQL_BLOCK for a PL/SQL block, STORED_PROCEDURE, and EXECUTABLE. And job class refers to the class assigned to the job, if any. The job action can be a PL/SQL block, stored procedure name, or executable program.

Expressions for calendaring include BYDAY, BYHOUR, BYMINUTE, AND BYSECOND to specify when jobs will run.

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In the DBA_SCHEDULERS table, the _SCHEDULER_JOB_ID column does not exist and is not a standard column or placeholder in the Oracle database schema.

The DBA_SCHEDULERS table provides information about the schedulers defined in the Oracle database. It contains columns including SCHEDULER_NAME, SCHEDULER_TYPE, NUMBER_OF_CPUS, ACTIVE_INSTANCES, and more. These columns store details about the scheduler configurations and characteristics.

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The DBMS_SCHEDULER.CREATE_JOB procedure can be used to create a scheduler job in Oracle. The below example is designed for SQL developers and shows a job that runs minutely:

BEGIN DBMS_SCHEDULER.CREATE_JOB (
 job_name        => 'MY_SCHEDULER_JOB',
 job_type        => 'PLSQL_BLOCK',
 job_action      => 'BEGIN
                    -- Job logic goes here
                    NULL;
                    END;',
 start_date      => SYSTIMESTAMP,
 repeat_interval => 'FREQ=MINUTELY',
 enabled         => TRUE,
 auto_drop       => FALSE,
 comments        => 'This is my scheduler job'
);
END;

Once the job is created, it will run minutely according to the specified schedule. Users can monitor job execution and view the job log file using various views like DBA_SCHEDULER_JOB_RUN_DETAILS and DBA_SCHEDULER_JOB_LOG. The DBMS_SCHEDULER.DISABLE, DBMS_SCHEDULER.STOP_JOB, and DBMS_scheduler.drop_job procedures will disable procedures, drop jobs, or stop jobs.

SYSTIMESTAMP will return system data in the timestamp return type.

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To run a scheduler job in Oracle, the DBMS_SCHEDULER.RUN_JOB procedures can be used along with other relevant SQL procedures from the exec DBMS_SCHEDULER package.

DECLARE
    job_name VARCHAR2(100) := 'MY_SCHEDULER_JOB';
BEGIN
    DBMS_SCHEDULER.RUN_JOB(job_name);
END;
/

In the above example, the job_name is set to MY_SCHEDULER_JOB. This will run the scheduler job as long as it’s been enabled using the DBMS_SCHEDULER.ENABLE procedure.

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In Oracle, the DBMS_SCHEDULER.SET_ATTRIBUTE procedure modifies attributes of a program associated with a scheduler job. The program_name parameter specifies the name of the program to be modified.

The program_name parameter represents the name of the program associated with a scheduler object or job. When passed to the DBMS_SCHEDULER.SET_ATTRIBUTE procedure it identifies the specific program that’s being modified.

The program_type parameter specifies the type of program being modified. This can be a stored procedure, executable, or external shell script. Program_action defines the action for the program.

Define_program_argument defines arguments for a program. Arguments can be passed to a program to provide dynamic values or inputs during execution.

Number_of_arguments is the number of arguments defined for a program. The program_name procedure is used in conjunction with this parameter to define and manage program arguments.

There is predefined metadata arguments that can be passed to programs if program logic is dependent on the scheduler environment.

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