Introduction

Introduction

CA Hyper-Buf improves VSAM buffer space allocation to reduce response time, elapsed job time, and I/O rate. This manual serves as a guide to the buffering procedures and facilities used by VSAM to accelerate processing and provide maximum performance.

CA Hyper-Buf chooses proper buffer sizes by dynamically analyzing the data set environment. CA Hyper-Buf computes buffer spaces based on the following factors:

• Hardware construction
• DASD type and track capacity
• Available virtual storage
• File access pattern
• File definition parameters
• File sizes
• Data and index CI sizes
• User customization parameters

Dynamic buffering is typically ineffective or impractical for jobs like CICS that open multiple files. What works for batch can keep CICS from coming up or otherwise negatively affect CICS performance. CA Hyper-Buf has special algorithms for tuning CICS buffer space. By coding one rule for any CICS partition, you can tune CICS to select optimum buffer space for online processing.

This section contains the following topics:

Dynamic VSAM Buffering

VSAM Buffering and Performance

Non-Shared Resources (NSR)

Local Shared Resources (LSR)

JCL Requirements