SYSB-II white papers
The state of CICS in the modern enterprise
Researching VSAM RLS as a way to eliminate downtime
VSAM RLS increases concurrency and availability for CICS in an online mode by preventing a sole CICS region from being both a single point of failure and a potential bottleneck. However, VSAM RLS does not provide concurrent access between CICS and batch while also ensuring data integrity.
This series of briefings discusses when VSAM RLS can help with downtime, and when it can’t.
Alternatives for making VSAM files available to batch and CICS
Mainframe data still drives the world's information systems. Unlocking this data, keeping it available, and maintaining its integrity in a cost effective way is a pressing business challenge. One of the more common mainframe data scenarios involves CICS applications that require VSAM data.
While companies have to run batch in order to provide up-to-date information to online users, the traditional batch process still leaves those users without full access to VSAM data. Companies have reduced the batch window and forced batch updates to late-night windows when demand is low. But application downtime or limited access due to batch continues to affect users and other systems that rely on VSAM data.
In this white paper, you'll learn about some of the conventional approaches such as SHAREOPTIONs, VSAM RLS, and TVS, to solving the limitations of the batch window. This installment also discusses a solution that eliminates underlying batch conflict issues to deliver true data availability. VSAM files are shared inside of CICS, making batch jobs appear like any other online transaction, so CICS continues to have full READ/WRITE access even during batch. From the series Concurrent VSAM access for batch and CICS.
Transactional VSAM (DFSMStvs)
You'll see how TVS works, the benefits, and the issues to consider. Read this guide if you are considering TVS or other solutions for concurrent sharing of VSAM files between CICS and batch processing. From the series Concurrent VSAM access for batch and CICS.
VSAM Record-Level Sharing (RLS)
VSAM RLS was designed to enable VSAM files to be shared with full update capability between many applications running in many CICS regions. Read this white paper for a more detailed look at this solution and the changes required to use files in VSAM RLS mode for batch and CICS processing. From the series Concurrent VSAM access for batch and CICS.
Transparent VSAM file sharing via CICS and batch
You will read about the concepts that underlie this type of solution and the issues to consider with any method of sharing VSAM files. These topics are architecture; performance, reliability, and scalability; recovery; and CICSplex and sysplex scalability. From the series Concurrent VSAM access for batch and CICS.