OS 390 MVS ESA Fundamentals of VSAM Part I 
This course covers the concepts needed to design, or code, applications that use the
Virtual Access Storage Method (
VSAM). It begins with an overview of VSAM, describes what VSAM does for application programs that request its services, the four types of VSAM datasets, followed by a detailed explanation of the VSAM entry-sequenced dataset. The course then examines the physical organization of a
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OS 390 MVS ESA Fundamentals of VSAM Part II This course explains how
VSAM adds and deletes records to and from a
KSDS. It describes how VSAM manages the space within the data components of the KSDS when it performs additions or deletions. Also covered is the organization and function of an alternate index, how and when an alternate index can be used, and how an alternate index relates to an existing
ESDS or KSDS. It describes the role that
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OPC/ESA Fundamentals 
