Accessing Open VSAM

Our obsession with VSAM continues this week, as we find another dark corner that has captured out interest: accessing VSAM dataset while they’re open. So this issue is purely technical, as we explore this little-documented part of VSAM.

It is generally accepted that accessing open VSAM files is bad. In our first article, we talk about when it may be OK to do this

In our second article, we do some testing to see if accessing VSAM datasets open to CICS is really as bad as they say, and if so, what we can do about it.

In our final article, we look more closely at VSAM read integrity: how you probably don’t have it, and may or may not need it.

We hope you enjoy this issue.