Saturday, 17 August 2013

DB2 History


Since the 1970s, when IBM Research invented the Relational Model and the Structured Query Language (SQL), IBM has developed a complete family of RDBMS software. Development started on mainframe platforms such as Virtual Machine (VM), Virtual Storage Extended (VSE), and Multiple Virtual Storage (MVS). 
In 1983, DB2 for MVS Version 1 was born.
"DB2" was used to indicate a shift from hierarchical databases like the Information Management System (IMS) popular at the time to the new relational databases. DB2 development continued on mainframe platforms as well as on distributed platforms. Figure 1.1 shows some of the highlights of DB2 history.

In 1996, IBM announced DB2 UDB Version 5 for distributed platforms. With this version, DB2 was able to store all kinds of electronic data, including traditional relational data, as well as audio, video, and text documents. 
It was the first version optimized for the Web, and it supported a range of distributed platforms for example, OS/2, Windows, AIX, HP-UX, and Solaris from multiple vendors. Moreover, this universal database was able to run on a variety of hardware, from uniprocessor systems and symmetric multiprocessor (SMP) systems to massively parallel processing (MPP) systems and clusters of SMP systems. 
IBM included the term "Universal" in the name to represent the new capabilities of this version. All versions of DB2 on distributed platforms and on MVS, AS/400, VM, and VSE have adopted the name DB2 UDB.
The DB2 database management system operates as a formal subsystem of the z/OS operating system. DB2 processes can be executed in various address space regions within z/OS, such as IMS or CICS. Because it is required for DB2 version 8, z/OS provides a new architecture that supports a 64-bit operating system. Thus, the z/OS platform can support many diverse applications with increased availability, scalability, and security.
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