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HVSHARE - High Volume Share

Enhanced Definition

HVSHARE (High Volume Share) is a specific attribute within **VSAM Record Level Sharing (RLS)** designed to optimize performance and concurrency for **VSAM KSDS** datasets experiencing high transaction volumes, particularly in a **CICS** environment. It enables multiple applications, often across different z/OS images in a **sysplex**, to share the same dataset with improved throughput and reduced contention.

Key Characteristics

- Part of the VSAM RLS feature set, requiring RLS to be active for the dataset and the RLS address space (SMSVSAM) to be running.
- Configured via the HSP (High-Speed Processing) attribute in an SMS data class, which is then assigned to the VSAM KSDS through its IDCAMS DEFINE CLUSTER statement or dynamic allocation.
- Leverages Coupling Facility (CF) structures to manage record-level locks and cache data, facilitating efficient sharing across multiple z/OS systems in a sysplex.
- Aims to reduce contention and improve I/O performance for datasets with a high ratio of reads to writes, or where updates are typically localized to specific records.
- Provides enhanced concurrency management compared to standard RLS for specific high-volume access patterns,