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In [[IBM mainframe]]s, '''Workload Manager''' ('''WLM''') is a base component of [[MVS/ESA]] mainframe [[operating system]], and its successors up to and including [[z/OS]]. It controls the access to system resources for the work executing on z/OS based on administrator-defined goals. Workload Manager components also exist for other operating systems. For example an '''IBM Workload Manager''' is also a software product for [[AIX operating system]].
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On a mainframe computer many different applications execute at the same time. The expectations for executing work are consistent execution times and predictable access to databases. On [[z/OS]] the Workload Manager (WLM) component fulfills these needs by controlling work's access to system resources based on external specifications by the system administrator.
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