Elimination - Removing
Enhanced Definition
In the context of IBM mainframe systems and z/OS, "Elimination - Removing" refers to the controlled process of permanently or temporarily deactivating, deleting, or decommissioning data, resources, programs, or system components from active use or storage. This action is typically performed to reclaim system resources, enforce data retention policies, maintain system hygiene, or manage the lifecycle of applications and data.
Key Characteristics
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- Scope: Can apply to a wide range of entities, including datasets (VSAM, sequential, PDS/PDSE members), database records (DB2 rows, IMS segments), user IDs, security profiles (RACF), CICS transactions, IMS programs, or entire applications.
- Authorization Required: Requires specific security authorizations (e.g., RACF permissions) to prevent unauthorized data loss, system disruption, or compliance violations.
- Irreversibility: Depending on the method and type of entity, elimination can be irreversible, making careful planning, impact analysis, and backup procedures essential.
- Resource Reclamation: A primary goal is often to reclaim valuable system resources such as disk space, memory, or CPU cycles occupied by obsolete, temporary, or inactive entities.
- Utility-Driven: Frequently involves the use of specific z/OS utilities (e.g.,
IDCAMS DELETE,IEHPROGM,DFSMSdss), database utilities (e.g., DB2LOAD REPLACEwithDELETEoption, IMSDBDGEN/PSBGEN), or application-specific programs. - Auditing and Logging: Critical elimination activities are typically logged in system journals, security audit trails, or application-specific logs for compliance, troubleshooting, and accountability.
Use Cases
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- Dataset Management: Deleting temporary datasets (
TEMP), obsolete production datasets, or archived data volumes using JCLDISP=(OLD,DELETE)orIDCAMS DELETEcommands. - Database Maintenance: Purging old transaction
- Dataset Management: Deleting temporary datasets (
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