Charles Bachman

See also: Bachman

Charles William Bachman , born the December 11th 1924 with Manhattan in Kansas, is a American Informaticien , pioneer in the field of the databases and the data-processing networks. One owes him the concept of the modern DBMS (architecture Ansi-Sparc), the first modern DBMS (IDMS-2), the data model network (CODASYL) and the model of communication network OSI.

It received the Prix Turing in 1973 for its exceptional contributions on technologies of the databases. He was elected as a comrade distinguished from the British Computer Society in 1977 for his important work in the data-processing systems.

Contrary to the other prizes winner of the Turing price, Bachman did not work in the academic world but passed its whole career as an industrial researcher. It started has to work in 1950 in the company Dow Chemical until becoming data processing manager. It leaves Dow Chemical in 1960 to join General Electric where it develops IDS (Integrated Data Blind) which will be one of the first basic management systems of data. He works jointly with Weyerhaeuser Lumber and develops the first access multiprogramming to database IDS. Later it develops “Databasic” a product which makes it possible the language BASIC to have access to the database and which is used by the system Pick and the related SGBDR Multivalués.

Later its career, it joined more a small firm, the information systems of Cullinane (late Cullinet called), which offered a version of the identifications which was called IDMS and was constant the Mainframe S of IBM.

In 1983, it founded the information systems of Bachman which developed a range of the products computer-assisted of CASE of technology of the programming. The showpiece of these products was the analyst of BACHMAN/Data, which provided the graphic support to the creation and the maintenance of the diagrams of Bachman of diagrams of structure of data. It was described in the programme of marketing of cycle of the remachination of IBM: combining 1) the désossage obsolete databases of central processing unit, 2) of the data modelling, 3) technology forwards with new physical databases, and 4) the optimization of the basic designs of physical data for the execution and the details of the management system of databases.

It is known to have had surging discussions with Dr. Edgar F. Codd, which supported the model databases connected compared to the approaches of basic navigation of data claironnées by Bachman.

Charles Bachman and the data model in network CODASYL

The C onference O N DA your SY stems L anguages (CODASYL), in French " Conference on the languages of systems of treatment of données" is the American organization of coding of the data-processing systems. It published into 1959 the specifications of the language COBOL. Thereafter, its work between 1974 and 1981 gave rise to the model navigationnel DBMS (opposite with the hierarchical model largely promoted by IBM).

In 1965, the CODASYL constituted an work group charged to develop the extensions of the language COBOL which will make it possible to handle data by preserving independence between the applications and the peripherals of storage. The contribution of Charles Bachman returns to the logic of chains of data and pointers implemented in particular in system IDS.

In 1967, this work group renamed " Base Group" Task dated; (DBTG) which published in particular " COBOL extensions to handle dated bases" (extensions of COBOL to handle data).

In October 1969, the DBTG then publishes the first specifications of the model of databases network which will very quickly take the name of data model CODASYL and the diagrams of Bachman curve a standard of representation design modeling of the databases.

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