VSAM Data Access Techniques
There are three types of access techniques for VSAM data:
- Local Shared Resources (LSR)
- Global Shared Resources (GSR)
- Non-Shared Resources (NSR)
Each is optimised for different access patterns. For example, LSR is optimised for "random" or direct access, whereas NSR is optimised for sequential access.
Another difference is that some access techniques are more available than others for specific execution and programming environments. For example, LSR access is easy to achieve from CICS while NSR access has historically been easier to use than LSR for batch programs.
Read more about this topic: Virtual Storage Access Method
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