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.