Vsam Data Set Naming Conventions, DSNDBx is

usability of the system and the need to manage it differently based on what set of data this actually is.

C.4.2 VSAM Data Set Naming Conventions

Many companies have decided that it is a good idea to associate all of the VSAM components with the base cluster by some recognition pattern. Some of the reasons behind this have to do with billing, and also with the usability of doing catalog locates and so on, to find all of the associated components easily with available software technology.

The normal standard that has been adopted in most cases is the first portion of the name being the cluster name and the component name of DATA, INDEX, or AIX name. For example, consider a VSAM cluster of X.Y.Z that was a KSDS with two AIXs which were also keyed data sets. Also, assume that there were two path names defined over the alternate indexes. The set of names would be:

X.Y.Z

X.Y.Z.DATA

X.Y.Z.INDEX

X.Y.Z.PATH1

X.Y.Z.AIX1

X.Y.Z.AIX1.DATA

X.Y.Z.AIX1.INDEX

X.Y.Z.PATH2

X.Y.Z.AIX2

X.Y.Z.AIX2.DATA

X.Y.Z.AIX2.INDEX

C.4.3 DB2 Naming Conventions

The standard data set naming convention for all DB2 data sets is the following:

hlq.DSNDBx.dbname.tblspacename.I0001.A00n

where:

DSNDBx is

∙

DSNDBC -- cluster DSNDBD -- data component DSNDBI -- index component

dbname -- database name (user selected) tblspacename -- table space name (user selected)

I0001 -- hard-coded constant

A00n -- where ²n² is system generated for extensions to the table space

Although the DB2 naming convention is certainly distinguishable, it is difficult to associate different management policies for different sets of data within a particular database. For example, in a programming application, one can easily imagine different management policies for things such as SOURCE, MACRO, SCRIPT and so on, versus things such as OUTLIST, LISTING, TESTLIST, LIST, ASMLIST and so on.

Not all data within an application has the same management criteria --in the case of DB2 applications, it is difficult to place distinguishable characteristics

550VSE 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 Vsam Data Set Naming Conventions, 3 DB2 Naming Conventions, DSNDBx is

Models: OS/390