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2025-05-31 17:36 本頁面
【正文】 中文 3034 字 Database history The data bank technology from the birth to the present, in half century39。s time, has formed the solid rationale, the mature mercial product and the widespread application domain, attraction more and more researchers joins. The database birth and the development have brought a huge revolution for the puter information management. More than 30 for years, domestic and foreign already developed have constructed tens of thousands of databases, it has bee the enterprise, the department and even individual routine work, the production and the life infrastructure. At the same time, along with application expansion and thorough, database quantity and the scale are getting bigger and bigger, the database research area also already greatly developed broad and deepens. during 30 years the database domain has obtained three puter Turing (. Bachman, , ), explained fully the database is one vital and the innovative spirit domain. Lets us along the historical path, traces the database the devel. The Data management of birth The database history may trace 50 years ago, at that time data management was simple. Through massive classified, the parison and the form plan39。s machine run several million punched card carries on the data processing, its movement result prints on the paper or makes the new punched card. But the data management is carries on physical to all these punched card the storage and processing. However, Remington Rand Corporation (Remington Rand Inc. ) one kind was called the Univac I puter to promote one kind of one second to be possible to input several hundred records the tape drives, thus has initiated the data management revolution in 1951. IBM produced first disk driver the Model 305 RAMAC in 1956. This driver has 50 disk sheets, each disk sheet diameter is 2 feet, may store up 5MB the data. Uses the floppy disk biggest advantage is may deposit and withdraw the data stochastically, but the punched card and the magic tape can only the sequential access data. Cullinane Corporation (was also afterward Culli software pany) in 1973, started to sell Goodrich Corporation39。s IDMS improvement edition, and became at that time in gradually the world the biggest software pany. The Relational database of the origin The ted database and the level database well had already solved the data centralism and the sharing question, but still had in the data independence and the abstract rank is very greatly defective. The user when carries on the deposit to these two kind of databases, still needed to be clear about the data the memory structure, points out the access path. Then appears the relational database has solved these problems well. In 1970, IBM Researcher Dr. “Communication of the ACM” on has published named in the publication “A Relational Model of Data for Large Shared Data Banks” the paper, proposed relational model39。s concept, has laid the relational model rationale. Although before Childs already proposed face the set model in 1968, however this paper was revealed generally is in the database system history has the epochmaking significance milestone. The Codd wish is for a database creation exquisite data model. Afterward Codd one after another published ma
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