This development led to a new type of database system known as the network DBMS, which had a profound effect on the information systems of that generation. This work was headed by one of the early pioneers of database systems, Charles Bachmann. In the mid-1960s, another significant development was the emergency of IDS (Integrated Data Store) from General Electric. Although one of the earliest commercial DBMS, IMS is still main hierarchical DBMS used by most large mainframe installations. This restriction was subsequently dropped. The reason why IBM restricted IMS to the management of hierarchies of records was to allow the use of serial storage devices, most notably magnetic tape, which was a market requirement at that time. In the mid 1960s, IBM joined NAA to develop GUAM into what is now known as IMS (Information Management System). This structure, which confirms to an upside down tree, is also known as a hierarchical structure. GUAM was based on the concept that smaller components come together as parts of larger components, and so on, until the final product is assembled. As a result, North American Aviation (NAA, now Rockwell International), the prime contractor for the project, developed software known as GUAM (Generalized Update Access Method). At that time there was no system available that would be able to handle and manage the vast amounts of information that the project would generate. It has been suggested that the DBMS has its roots in the 1960s Apollo moon-landing project, which was initiated in response to USA’s President Kennedy’s objective of landing a man on the moon by the end of that decade. In fact, the file-based system still exists in specific areas. However, there was never a time when the database approach began and the file-based system ceased. We have already seen that the predecessor to the DBMS was the file-based system. These are lacking on the user interface side, but can certainly compete on speed and scalability.ĭevelopments and Evolution of DBMS Concept There are also several very good free database software products, such as MySQL and PostgreSQL. In the middle are products like Microsoft SQL Server, which is a logical upgrade from Microsoft Access for Windows users. Products in this range can also be very expensive.
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