传统的数据库基本上是由(61)组成的。(62)在技术和理论上已经成熟,成为当前商用数据库的主流。(63)技术是20世纪80年代中期引入的。目前,多媒体数据库基本上靠与关系模式相结合的(64)来支持。但当数据量大,数据结构复杂时,靠(64)很难适应。当前,在DBMS的研究方面,较活跃的是(65)。
(88)
(89)
(71)data effectively is crucial for success in today's competitive environment. Managers must know how to use a variety of tools. Integrated data takes information from different sources and puts it together in a meaningful and useful way. One of the difficulties of this is the(72)in hardware and software.(73)integration uses a base document that contains copies of other objects.(74)integration uses a base document that contains the current or most recent version of the source document it contains.(75)provides an overview of the program written in" plain" English, without the computer syntax.
(86)
(87)
(83)
(84)
(81)
(82)
(78)
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