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The architecture of IMS DEDB Fast Recovery is centered around the automated recovery of DEDB databases after an emergency restart. The system is triggered during the IMS cold start procedure. The main components include the Recovery Manager, the DEDB Recovery Utility, and the Log Analysis component.
The Recovery Manager acts as the central coordinator, controlling the execution of the recovery process. It manages the DEDB Recovery Utility, which performs the actual recovery operations by replaying transactions from the IMS logs. The Log Analysis component analyzes the IMS logs to identify inconsistencies and determine the necessary changes to apply to the database.
Communication between these components is primarily internal to the IMS system, using standard IMS interfaces and control blocks. The system utilizes VSAM datasets for storing DEDB databases and IMS log datasets for transaction replay. There are no specific network ports or external APIs exposed by the product.
The configuration involves setting parameters related to log dataset allocation, buffer sizes, and the specification of DEDB areas to be recovered. The system integrates with the IMS security environment, leveraging access controls provided by RACF or similar security managers. The recovery process is designed to be automated and integrated within the existing IMS infrastructure.
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