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CICS Transaction Processing on zOS: Core Concepts and Workflow

Author(s) Chandra mouli Yalamanchili
Country United States
Abstract For over five decades, IBM’s Customer Information Control System (CICS) has remained a foundational transaction processing platform on IBM z/OS. This paper offers a detailed review of CICS by exploring its historical evolution, diverse architectural models, and the role of its specialized regions (TOR, AOR, DOR, and FOR). It discusses how resources are defined, stored, and managed via CSD and CEDA and explains CICS data objects and storage areas. A significant focus is given to the mechanics of transaction processing, supported by discussions on ACID properties, commit and rollback mechanisms, and recovery and restart features.
The paper also examines various CICS components like Task Control Blocks (TCBs), internal, inter, and external communication interfaces, and integration with external resource managers for MQ & DB2. Finally, the paper explores transaction processing with coding examples and explanations.
This paper represents a personal interpretation and synthesis of IBM documentation intended to aid those seeking to deepen their knowledge of CICS.
Field Engineering
Published In Volume 2, Issue 3, March 2021
Published On 2021-03-03
Cite This CICS Transaction Processing on zOS: Core Concepts and Workflow - Chandra mouli Yalamanchili - IJLRP Volume 2, Issue 3, March 2021. DOI 10.5281/zenodo.15154786
DOI https://doi.org/10.5281/zenodo.15154786
Short DOI https://doi.org/g9cskf
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