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CICS is an online, high-performance transaction server designed to handle thousands of concurrent terminal users. Crucial Control Blocks and Programs

SQL statements are written directly inside COBOL programs, bounded by EXEC SQL and END-EXEC .

Defines variables across FILE SECTION , WORKING-STORAGE SECTION , and LINKAGE SECTION . PROCEDURE DIVISION: Houses execution logic and algorithms. Data Types and Storage Formats mainframe refresher by muthu pdf link

VSAM is a high-performance file management system used for organizing and accessing data records.

: Allows COBOL programs to process multi-row query results one row at a time. CICS (Customer Information Control System) PROCEDURE DIVISION: Houses execution logic and algorithms

Links the logical file name inside a program to the physical dataset on the disk or tape.

Working-Storage Section: Holds temporary variables, flags, and constants. CICS (Customer Information Control System) Links the logical

Memory is divided into the Common Service Area (CSA), System Queue Area (SQA), and Private Areas allocated to specific user jobs. Multi-Programming and Workload Management (WLM)

Initiates the job, defines accounting information, assigns execution priority (CLASS), and establishes output routing (MSGCLASS).