Mainframe Forum

Mainframe Forum: A comprehensive repository for programming tutorials and technology news. Got a minute? Click upon those blue words to start learning in Cobol, DB2, CICS, JCL, CA7, APIs, DevOps, Agile, JAVA, SORT, Excel macro, python, and mainframe tools.

Monday, 31 August 2026

RACF Security Audit Checklist: LISTUSER, RLIST, SETROPTS, and SMF

Check access before changing RACF audit settings. Last updated: August 31, 2026 A RACF audit normally starts wi...

Saturday, 29 August 2026

What Is z/OS? The Operating System Running the World's Banks and ATMs

z/OS explained. Right now, as you read this, someone somewhere is withdrawing cash from an ATM. A traveler is checking a flight status. A ho...

Thursday, 9 July 2026

Db2 Schemas Guide: Qualifiers, CURRENT SCHEMA, and COBOL SQL

A COBOL program can pass bind, compile, and link-edit, then still fail at runtime with SQLCODE -204 because Db2 looked for the table under ...

Sunday, 5 July 2026

ISPF vs Zowe vs Topaz: Mainframe Tool Comparison

ISPF still matters, but Zowe and BMC AMI DevX/Topaz change how teams edit, test, and automate mainframe work. Last upd...

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