計(jì)算機(jī)專業(yè)畢業(yè)設(shè)計(jì)外文翻譯--數(shù)據(jù)庫發(fā)展史-在線瀏覽
2025-07-30 17:36本頁面
【正文】 terward ANSIX31681989, “Database Language Embedded SQL” constituted the first generation of SQL standard. ANSIX3135 1992[ANS92] described one kind of enhancement function SQL, now is called the SQL 92 standard. SQL 92 including pattern operation, dynamic enhancement characteristics and so on foundation and SQL sentence dynamic execution, work environment support. After pleting the SQL 92 standard, ANSI and ISO namely start to cooperate develop the SQL3 standard. The SQL3 main feature lies in the abstract data type the support, has provided the standard for the new generation object relationship database. Objectoriented database Technology is very mature, but its limitation is also obvious: It can process socalled “the form data” well, more and more plex type39。s development direction question, the industrial field once was quite puzzled. At that time technical unrest influence, in quite period of time, people massive energy flower in research “objectoriented database system (object oriented database)” or abbreviation “OO database system” What is worth mentioning, American Professor Stonebraker proposed the objectoriented relations database theory once received the industrial field the favor. But Stonebraker myself at that time was also hired by the Informix flower high price for the technical total person in charge. However, several year39。s market development39。s main design concept is the attempt substitutes for the existing database system with the new database system. This to many already and accumulated the much work data customer using database system many years, particularly the big customer, is unable the giant work load which and the large amount expenditure withstands during the recent legacy data the transformation to bring. Moreover, the objectoriented relations database system causes the query language bees extremely plex, thus causes, regardless of being the database development business regards its plex applied technology using the customer is the perilous undertaking. Data management of the transformation In the 1960s later period presented one kind of new database software: Decision support program (DSS), its goal is lets the superintendent use the data message effectively in the decisionmaking process. Therefore in 1970, first online analysis processing tool Express was born. Other decision support system follows, many are develops by pany39。 Gamble Corporation develops by the Metaphor puter system Limited pany, was mainly uses for to connect the sales message and the retail sales scanner data. In the same year, the Pilot software pany starts to sell the first mercial customer/server to carry out information system Command Center. Similarly in this year, the UC Berkeley branch school Ingres project evolves Postgres, its goal develops an objectoriented database. Hereafter one year, Graphael Corporation has developed first mercial object database system Gbase. In 1988, IBM Corporation39。s widespread use, data management39。s appearance, opened a stretch of new world for the database system39。s unceasing expansion, presented the bountiful data model (level model, work model, relational model, object oriented model, half structurized model and so on), the ne
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號(hào)-1