• History and evolution of mainframes
• Importance of mainframes in enterprises
• Mainframe vs distributed systems
• Industries using mainframes
• Career opportunities in mainframe technology
• CPU, memory, and storage concepts
• Input and output devices
• Logical partitions (LPARs)
• Mainframe processing model
• System reliability and scalability
• z/OS architecture overview
• Address spaces and regions
• System libraries and datasets
• z/OS startup and shutdown
• Basic system commands
• Logging on to TSO
• ISPF panels and menus
• Dataset management using ISPF
• Editing and browsing files
• Productivity tips in ISPF
• Sequential datasets
• Partitioned datasets (PDS/PDSE)
• VSAM datasets overview
• Dataset allocation and deletion
• Naming conventions and standards
• JOB, EXEC, and DD statements
• Running batch jobs
• Dataset allocation in JCL
• Utility execution
• JCL error handling
• IEBCOPY utility
• IEFBR14 utility
• SORT utility basics
• IDCAMS overview
• Utility use cases
• COBOL program structure
• Data division concepts
• File handling basics
• Conditional and looping statements
• Compiling and executing COBOL programs
• KSDS files
• ESDS files
• RRDS files
• VSAM file access methods
• VSAM error handling
• DB2 architecture basics
• Tables, indexes, and tablespaces
• Writing basic SQL queries
• DB2 utilities overview
• DB2 integration with COBOL
• Online transaction processing concepts
• CICS architecture
• CICS programs overview
• BMS maps basics
• CICS commands







