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enclave


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DEFINITION - In IBM's OS/390 operating system, an enclave is a representation of a business transaction or unit of work. Each individual enclave that is active in an address space is assigned a unique dispatching and input/output (I/O) priority, which is determined by the goals the user assigns to the enclave. The OS/390 workload manager then allocates resources to each enclave based on its priority. If several transactions are concurrently sharing the same address space, the less important transactions are deferred until resources needed by the more important transactions become available.

Transaction managers such as DB2 V4 Distributed Data Facility (DDF), DB2 V5 Stored Procedures, IBM HTTP Server for OS/390, and MQSeries Workflow use enclaves.

Learn more about Mainframe computers
Mainframe Management: The modern mainframe: This isn't your gramps' Big Iron. Mainframe management has evolved dramatically over the past few years.
Roadmap to mainframe application modernization: In a three-part series, Infostructure Associates president Wayne Kernochan outlines a modernization path for business-critical applications in an existing mainframe environment.
Top five mainframe tips: Data center pros are asking questions about the expanding role mainframes play in the business.
Mainframe Management: The modern mainframe: This isn't your gramps' Big Iron. Mainframe management has evolved dramatically over the past few years.
Using CICS dump tables to manage problems in online systems: The CICS dump table feature can be useful for diagnosing and managing problems in online systems when the information you need isn't available through default channels.
High mainframe software costs may lead to platform's demise: Are mainframe software costs too high or does software productivity and reduced labor costs lead to lower mainframe total cost of ownership (TCO)?
Manage CICS workloads with transaction classes: Using transaction classes is a great way to manage CICS workloads that come in unpredictable increments. Learn how to use transaction classes and get examples in this tip.
Run CICS in batch to beat a shrinking batch window: As batch windows are getting shorter, it becomes harder to run traditional VSAM-based CICS systems. Try running CICS in batch as a low-cost solution.

CONTRIBUTORS: Mike Minogue
LAST UPDATED: 01 Nov 2005

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