外文翻译----数据库和数据仓库(编辑修改稿)

外文翻译----数据库和数据仓库(编辑修改稿)内容摘要：

Objectoriented database are still a relatively new technology and can be much slower than relational systems for handing large quantities of data where there is a high volume of transaction processing. Hybrid objectrelational data bases have been developed that bine the capability of handing large numbers of transactions found in relational Dams with the capability of handing plex relationships and new types of data found in Odom’s. Hypermedia Database Hypermedia database manage data differently from object oriented DBMS. but they can also contain diverse types of data. They store data as “chunks”of information, with each chunk in a separate node. Each node can contain traditional numeric or character data or wholedocuments ,software programs, graphics, and even full motion video. Each node is totally independentthe nodes are not related by a predetermined organization scheme as they are in traditional database. Insured, user establishes their own links between nodes. The relationship among nodes is less structured than in a traditional DBMS. Searching for information does not have to follow a predetermined organization scheme. Users can branch directly form one node to another in any relationship they establish. For instance, a hypermedia database on automobiles might link basic product information with descriptive sales brochures, a video showing the automobile in action, and the location of authorized dealers. Data Warehouses Many panies have allowed their data to be stored in many separate systems that are unable to provide a console dated view of information usable panywide. One way to address this problem is to build a data data warehouse is a database that consolidates data extracted from various production and operational systems into one large organization’s core transaction processing systems are reorganized and bined with other information, including historical data so that they can be used for management decision making and analysis. In most cases, the data in the data warehouse can be used for reportingthey can not be updatedso that the performance of the pany’s underlying operational system is not affected. The focus on problem solving describes some of the benefits panies have obtained by using data warehouses. Data dictionary The data dictionary (Data dictionary) is the record database which and the application 毕业设计（论文）外文翻译 5 procedure Yuan data table of contents one kind of user may visit. The initiative data dictionary is refers to when makes the revision to the database or the application program structure, its content may the data dictionary which renews automatically by DBMS. The passive data dictionary is refers to when the revision must renew its content manually the data dictionary. The data dictionary is a reservation space, a database, this is uses for the store information database itself. The data dictionary possibly contains information, for example: The database design material, the storage SQL procedure, the user jurisdiction, the user statistics, in the database process39。 s information database growth statistics, the database performance statistics, the data character canonical is in the system each kind of data description set, carries on the main achievement which the detailed data collection and the data analysis obtain. The data dictionary usually includes the data item, the construction of data, the data stream, the data storage and the treating processes five parts. The data dictionary is about the data information set, is also all element definition set which contains to the data flow。