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There are four types of access techniques for VSAM data:
* Local Shared Resources (LSR), is optimised for "random" or direct access. LSR access is easy to achieve from [[CICS]].<ref name=VSAM.LSRorNSR>{{cite web
|url=https://www.ibm.com/support/knowledgecenter/SSGMCP_5.6.0/tuning/dfht3c00200.html
|title=Local shared resources (LSR) or nonshared resources}}</ref>
* Global Shared Resources (GSR)
* Non-Shared Resources (NSR), which is optimised for sequential access. NSR access has historically been easier to use than LSR for batch programs.<ref name=VSAM.LSRorNSR/>
* Distributed File Management (DFM), an implementation of a [[Distributed Data Management Architecture]] server, enables programs on remote computers to create, manage, and access VSAM files.
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