Processing restrictions

The following restrictions apply to DFSMStvs processing:

VSAM RLS and DFSMStvs do not support these features:
- Linear data sets
- Control interval access (CNV) for any data set organization.
- Addressed access to a KSDS
- Access to key range data sets
- Access to clusters with the IMBED attribute
- Access to temporary data sets
- Access using the ISAM compatibility interface
- Open of the individual components of a cluster
- Direct open of an alternate index
- Use of GETIX and PUTIX
- Checkpoint/restart
- Catalogs accessed in RLS or DFSMStvs mode
- VVDSs access in RLS or DFSMStvs mode
- The ACBSDS specification
- Implicit positioning at OPEN; an explicit POINT or GET NSP is required
- Hiperbatch
- CFX (ignored; NFX is assumed)
- DDN/DSN (ignored)
- DFR (ignored; NDF is assumed for direct requests that do not specify NSP)
- Improved control interval processing
- Control blocks in common (CBIC)
- UBF (user buffering)
- SHRPOOL (ignored)
z/OS DFSMStvs Planning and Operating Guide describes some additional restrictions.