data

access 182

driven output segmentation 75 entry 76

integrity 125 management macros 292 management standards 407 manipulation 159 replication 182

sharing 125 TCP/IP related 195 transfer and NJE 405

Data Base Descriptor (DBD) 170 Data Control Block (DCB) 98

DATA DIVISION - FILE DESCRIPTION (FD) 256 data set

CICS system requirements 145 editing 438

generation 551

intra-region name sharing 128 level 547

MQSeries 202 names 81, 116

naming considerations 99 naming guidelines 543 naming standards 408 NOALLOCATION 123 reusable 123

single region sharing 128 sorting multiple 132 TSO names 159

VSAM sharing alternatives 130 VSE naming 99

VTAM 186

data set name components data set level 547

file contents 546

High-Level Qualifier (HLQ) 544 relative importance 546

user name 547 data set name exclusions

access method 549 application location 548 department number 547 expiration date 548

job name 549 management criteria 548 output device type 548

DATA statement - * $$ DATA 89 database 169

administrator (DBA) 180 portability 175 reloading 176 unloading 176

DATE 81, 274

date concerns during parallel testing 515 DB2 guest sharing 429

DB2 naming conventions 550

DB2 transparency feature 130

DBA 180

DBD 170

DDstatement 84

DDNAME PREFIXES 341 default models 123 defaults - POWER 79 DEFINE 123

defining

a file 72

AFP resources 240 BLKSIZE 293 BSC remotes 228

channel-attached printers to MVS 236 compaction tables 230

MQSeries object and operating 203 network printers 236

NJE 221

NJE nodes 230

SNA remote workstations 229 definition

2-digit-year format 565 20th century 565 21st century 565

4-digit-year format 565 CCYY format 567 century 568

century byte 568 cosmetic 568 external side 571 fixed window 571 Gregorian calendar 571 integer date 573 internal side 573 Julian date 574

leap year 574 Lilian date 574 ordinal day of year 576 rolling window 578 sliding window 579 year2000 challenge 582 year2000 ready 582 year2000 support 582 year2000 transition 582 YY format 582

YYYYformat 582

DELETE IGNOREERROR 121 department number 547

dependent programs dynamic loading 334 descriptions of users 178

design MVS target output 501

detailed comparisons POWER/JES2 225 developer 179

developing the plan 41 device

address specifications 80 allocation 448

598VSE to OS/390 Migration Workbook

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IBM manual VSE to OS/390 Migration Workbook
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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.
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