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A prerequisite is a job that keeps other jobs from executing until it is competed. For instance, you may have a number of jobs that can only run if a previous job has completed updating a file or a database.
In addition to the basic prerequisite, you can set up to five conditions to each prerequisite job. These conditional algorithms allow you to control whether a prerequisite releases a subsequent job based on the evaluation of the statement
In order to define the nature of the prerequisite definition click on Add to define a new prerequisite or select a prerequisite and select Edit from the Connections window. The Prerequisite definition window will appear as shown.
The field in the left hand corner represents the job that will be held up until the currently selected job completes. It may be changed by entering the desired job or using the Browse button to select a specific job.
If no conditions are added, the currently selected job will hold up the subsequent job until it completes. By clicking on the More button, additional conditions may be put on the prerequisite. The if condition has a variable or parameter (from the parameter list), an operand and a value that must be met to allow the prerequisite to release the job. These are all selected from drop down lists.
As many as five conditions may be added to the prerequisite definition. The relationship between the conditions is an OR condition. In other words, if any of the conditions is met it will release the subsequent job. To remove conditions, click on the Less button.