CICS VSAM Transparency for z/OS, Version 1.2


Introduction to CICS VT

VSAM was first released with the IBM® MVS™ operating systems OS/VS1 and OS/VS2 in the early 1970s. It has been the underlying access method for the IBM DB2® software on MVS and OS/390® since the first release. It is also the most common access method for IMS™ databases.

As well as being the core of IBM relational and hierarchical database management systems, VSAM became the preferred choice for CICS® users when support was introduced in 1974.

The IBM z/OS® Database Management System (DBMS) provides an operability layer that interfaces with the data access layer. Some of the main functions provided by the DBMS layer are:

These functions are limited for programs that access VSAM files natively.





Last updated: May 25, 2012 20:44:7