/XRL/19

D040007

2043CH04

 

 

 

76

(1)

JCL differences (VSE and MVS)

 

 

(2)

operator intervention

 

 

 

76, 76, 77, 77

D040008

2043CH04

 

 

 

78

(1)

JCL differences (VSE and MVS)

 

 

(2)

resource allocation

 

 

 

78

D040009

2043CH04

 

 

 

78

(1)

JCL differences (VSE and MVS)

 

 

(2)

hidden JCL

 

 

 

78, 79, 79, 79

D040012

2043CH04

 

 

 

81

(1)

JCL differences (VSE and MVS)

 

 

(2)

JCL partition dependent codes

 

 

 

81, 81

D040013

2043CH04

 

 

 

81

(1)

JCL differences (VSE and MVS)

 

 

(2)

communication region

 

 

 

81, 82

D040014

2043CH04

 

 

 

82

(1)

JCL differences (VSE and MVS)

 

 

(2)

VSE Job Control statements

 

 

 

82, 82, 82, 83, 83, 83, 83, 83, 84

D040015

2043CH04

 

 

 

84

(1)

JCL differences (VSE and MVS)

 

 

(2)

MVS Job Control statements

 

 

 

84, 84, 84, 84, 85

D050011

2043CH05

 

 

 

103

(1)

tape similarities & differences

 

 

(2)

standard labels

 

 

 

105

D050019

2043CH05

 

 

 

110

(1)

VSAM differences

 

 

(2)

OS/390 catalogs

 

 

 

111, 112, 114, 114, 115

VOSIND

2043CH05

 

 

 

114

(1)

VSAM

 

 

(2)

OS/390

 

 

 

114, 114, 115, 117, 127, 129, 129, 387

D050021

2043CH05

 

 

 

117

(1)

VSAM differences

 

 

(2)

OS/390 - VSE/VSAM catalog compatibility

 

 

 

118, 118, 119

D050022

2043CH05

 

 

 

119

(1)

VSAM differences

 

 

(2)

VSAM functional differences

 

 

 

119, 120, 120, 120, 120, 121, 121, 121, 121, 121, 122,

 

 

 

122, 123, 123, 123, 123, 124, 124, 124, 125, 125, 125

D050023

2043CH05

 

 

 

125

(1)

VSAM differences

 

 

(2)

data sharing & integrity

 

 

 

126, 127, 128, 128, 128, 129, 129, 129, 130, 130, 130, 130

D050024

2043CH05

 

 

 

131

(1)

VSAM differences

 

 

(2)

programming languages support

 

 

 

131, 131, 131, 131, 131

CTRIND

2043CH06

 

 

 

133

(1)

CICS

 

 

(2)

transaction

 

 

 

133, 144, 149, 347

CSYSIND

2043CH06

 

 

 

138

(1)

CICS

 

 

(2)

system

 

 

 

138, 140, 145, 147, 147

D080005

2043CH08

 

 

 

171

(1)

DL/I & IMS/VS DB differences

 

 

(2)

batch programming

 

 

 

171, 171, 171, 172, 172, 172, 172, 172, 172, 173

D080006

2043CH08

 

 

 

173

(1)

DL/I & IMS/VS DB differences

 

 

(2)

utilities

 

 

 

173, 173

D080007

2043CH08

 

 

 

173

(1)

DL/I & IMS/VS DB differences

 

 

(2)

operations

 

 

 

173, 174, 174, 174

D080008

2043CH08

 

 

 

175

(1)

DL/I & IMS/VS DB differences

 

 

(2)

database portability

 

 

 

175, 176

D080010

2043CH08

 

 

 

178

(1)

SQL/DS to DB2

 

 

(2)

descriptions of users

 

 

 

178, 179, 180, 180, 181

Page 664 Page 666
Page 665
Image 665
IBM OS/390 manual XRL/19, Vosind, Ctrind, Csysind
Page 664 Page 666

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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