VSAM@Mainframe Programming
VSAM is an ACCESS METHOD designed to operate in a virtual storage environment.It is not a DBMS or a Language or a Communication System. The function of a VSAM is to provide an easy way for program to store data on and retrieve data from an external device without concern for a physical details of transferring bytes of data between the program and an I/O device.
VTAM
 
VSAM Demystified
VSAM, the Virtual Storage Access Method, is a general purpose access method intended to assist users in storing and retrieving data on disk devices of various types.

VSAM File & DASD Sharing
VSAM provides five levels of sharing and locking, with increasing sharability (and significant increases in overhead) as you change levels:


VSAM space allocation Q&A
How can I predict the number of logical records within a Control Interval (CI)? & Control Intervals within a Control Area (CA)?


VSAM and File and DASD Sharing
VSAM provides five levels of sharing and locking, with increasing sharability (and significant increases in overhead) as you change levels
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