Native VSAM SHAREOPTIONS for IDMS

Products

• IDMS

Issue/Introduction

Are there any requirements for the SHAREOPTIONS of native/VSAM files in IDMS?

Environment

Release : Any supported release.
Component : IDMS/DB

Resolution

The IDMS documentation at Controlling Access to Native VSAM Files says that "you can prevent concurrent update by specifying the parameter SHAREOPTIONS(2,3) in the DEFINE CLUSTER command during VSAM cluster definition".

This is actually a requirement. Native/VSAM files defined to IDMS must have SHAREOPTIONS(2,3). IDMS does not maintain physical area locks for native/VSAM files. SHAREOPTIONS(2,3) is used in order to ensure that concurrent update will be prevented at the VSAM level.

IDMS does not support Data Sharing for native VSAM files. See Shared Area Requirements.

 

Additional Information

Cross-region share options (IBM page).