Piocs PL/I, Include | IBM OS/390 guide

OS/390 documentation resources introduction references 39

key documents & other references 40 Web URL 40

OS/390 hardcopy processing 393 OS/390 software - order and install

entitled methods of installing OS/390 CBPDO 407

ServerPac 406

fee-based installation methods 405 installing OS/390 fee-based 405

other offerings 406

SoftwareXcel Installation Express (SIE) 405 SoftwareXcel SystemPac/MVS 406

OS/VS COBOL 131 other

components - tailoring 416 differences 243 differences POWER-JES2 209 hardware requirements 403 monitors 450

MVS names 409 offerings 406 OS/390 elements 416 sources 244

spool interfaces 222 utilities 244

our recommendation 424 OUTDES macro 241 output

device type 548 disposition 217 file 343 retrieval 222, 441 segmentation 75, 216 service 215

OUTPUT JCL statement 84 outside consultants 30 overlapped activities 430 overlay in MVS 345 overlay structures 345 overriding JCL 76 overview

accounting management 471 change management 460 CICS transaction server 133 problem management 461 programming elements 327 systems management 457

PAGEIN macro 290 parallel activities 430

overlapped activities 430 parallel activities 430

synchronizing VSE with OS/390 applications 430 Parallel Sysplex 427

parameter handling 75

mapping POWER - JES2 225 passing 335

to be passed 340

partition dependent codes in JCL 81 partition independent file names 124 partition standard labels 78 partitioning 422

passing parameters into main program 335 patching facility JES2 231

PAUSE statement 77 PCB after GE status 172 PDUMP macro 279 performance 243

performance customer migration 531 performance management 463

methodology 464 overview 463 tasks 463

performance tools 475 permanent assignments 79 PFIX & PFREE macros 290 PFKeys 445

philosophy of OS/390 job control 70 philosophy of systems management 457 philosophy of VSE/ESA JCL 70 physical IOCS element comparison 328 pilot conversion 52, 487

PIOCS 327

PL/I

called by RPG II 331 calling SORT 340 checkpoint-restart 342 CICS & PL/I 346

CICS/VS transaction ABEND codes 346 COBOL vs. PL/I 351

DOS PL/I 356 functional differences

%INCLUDE 335

dynamic loading of dependent programs 334 EGCS (VSE) to DBCS (OS Version 2)

comments 333 extended precision 334 file organization 334 multitasking 334

parameters passed to a main program 335 interfaces 340

Optimizer DUMP 343 PL/I for VSE/ESA 354 PLICANC 343 PLICKPT 342 PLIREST 342

program conversion 345 programming interfaces 242 return codes 344

return from CICS transaction backout 347 return from ON-units 347

610VSE to OS/390 Migration Workbook

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.

IBM OS/390 manual Piocs PL/I, Include

Models: OS/390