VSAM Demystified

1.2. VSAM functions by release level

Some recent improvements to VSAM are extended format and extended addressability which allows a data set to go beyond the 4 GB limitation, system managed buffering (SMB) for improved performance, data compression, data striping, record level sharing (RLS), and most recently, transactional VSAM. Table 1-1 shows the recent VSAM enhancements by DFSMS release level.

Note

DFSMS/MVS® V1R5 was the last independent release. With z/OS V1R3, DFSMS became an integral component of z/OS. This book is written at the z/OS V1R4 DFSMS level.

Table 1-1. VSAM functions by release level

Function	Available since	Section described in
Data compression for VSAM KSDS	DFSMS/MVS V1 R2	“Data compression” on page 94
Extended addressability ...