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Specification of resource control requirements for a job provides a solution for the problem of resource sharing between different jobs. The mode (Exclusive or Shared) in which a resource is required by a job can be specified.
For example, a job that reads a database without performing updates can access the database in Shared mode; any other job requiring read-only access to the database can access the database at the same time. Conversely, a job that updates the database may require Exclusive control of the database at the time of update such that no other jobs can share the database.
In the example just presented, the database can be defined as a Control resource, and the type of control required by the job (Exclusive or Shared) can be specified for the resource.
Control-M considers the mode of resource usage required when allocating Control resources and prevents jobs whose resource usage is incompatible from executing simultaneously.
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