Learn JCL-TSO-SCRIPTS with Real Code Examples
Updated Nov 27, 2025
Performance Notes
Avoid unnecessary dataset I/O
Use SORT for efficient data transformation
Minimize job steps
Leverage VSAM for faster access
Schedule batch jobs during off-peak hours
Security Notes
Use RACF/TopSecret security permissions
Protect datasets with proper ACLs
Avoid exposing mainframe credentials in scripts
Audit job LOG and SYSOUT regularly
Follow z/OS data governance standards
Monitoring Analytics
Monitor with SDSF
Check MAXCC codes
Audit logs via JES
Track dataset growth
Inspect ABEND dumps
Code Quality
Consistent DD naming
Use PROCs for reuse
Clear comments for utilities
Structured error handling
Modular REXX scripts