软考 系统架构设计师系列知识点之杂项集萃（91）

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第166题

During the systems analysis phase, you must decide how data will be organized, stored, and managed. A（ ）is a framework for organizing, storing and managing data. Each file or table contains data about people, places, things, or events. One of the potential problems existing in a file processing environment is（ ）, which means that data common to two or more information systems is stoled in several places.
In a DBMS, the linked tables form a unified data structure that greatly improves data quality and access. A(n)（ ）is a model that shows the logical relationships and interaction among system entites. lt provide