Mainframe_Systems_Overview_mainframe modernization

Mainframe System Overview

1. Mainframe Systems Overview Batch and Online Architectures with Tech Stacks

2. Introduction to Mainframes - Mainframes are powerful systems designed for high reliability, scalability, and performance. - Used in industries like banking, healthcare, and government. - Operate in two modes: Batch Processing and Online Processing.

3. Mainframe Batch Architecture - Processes large volumes of data sequentially without user interaction. - High throughput, automated scheduling, and data-driven. - Key Tools: JCL, COBOL, DB2, VSAM, IMS, CA-7, Control-M. - Use Cases: Payroll processing, invoicing, report generation.

4. Batch Architecture Workflow 1. Job Submission: Defined using JCL. 2. Scheduling: Managed with tools like IBM Tivoli or Control-M. 3. Execution: Jobs processed sequentially or in parallel. 4. Output: Results stored in datasets or printed.

5. Mainframe Online Architecture - Supports real-time, interactive processing. - Handles multiple concurrent users with 24/7 availability. - Key Tools: CICS, IMS DC, DB2, Java, WebSphere, z/OS Connect. - Use Cases: ATM transactions, flight bookings, POS systems.

6. Online Architecture Workflow 1. User Request: Sent via terminal or web interface. 2. Middleware: Processes request (e.g., CICS). 3. Database Interaction: Retrieves or updates data. 4. Response: Displays results instantly.

7. Batch vs. Online Architecture Batch: - Sequential, non-interactive. - Scheduled during off-peak hours. - Tools: JCL, COBOL, DB2. Online: - Real-time, interactive. - Continuous availability. - Tools: CICS, Java, WebSphere.

8. Integration of Batch and Online - Modern systems often integrate batch and online processing. - Example: E-commerce systems process orders in real-time (online) and update inventory overnight (batch). - Ensures scalability and efficiency.