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MVS is the operating system that is installed on most of the mainframes. MVS has been said to be the operating system that keeps the world going. The transaction processing and database management programs critical to the world's largest businesses are usually run on an MVS system.
 JCL is a language for describing jobs to the MVS, OS/390, and VSE operating systems, which run on IBM's S/390 large server computers. These operating systems allocate their time and space resources among the total number of jobs that have been started in the computer.
 COBOL is designed specifically for commercial applications, such as payroll and inventory that typically operate on a large volume of data. The language instructions are very English-like, but the programmer has substantial choice as to whether to make a program self-documenting or obscure.
DB2 is a family of relational database management system (RDBMS) products from IBM that serve a number of different operating system platforms. According to IBM, DB2 leads in terms of database market share and performance. DB2 databases can be accessed from any application program.
CICS is an online transaction processing program from IBM that, together with the COBOL programming language, has formed over the past several decades the most common set of tools for building customer transaction applications in the world of large enterprise mainframe computing.
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2007 - Vaibhav