During the systems analysis phase, you must decide how data will be organized, stored, and managed. A (1) 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 (2), which means that data common to two or more information systems is stored in several places.In a DBMS, the linked tables form a unified data structure that greatly improves data quality and access. A(n) (3) is a model that shows the logical relationships and interaction among system entities. It provides an overall view of the system and a blueprint for creating the physical data structures. (4) is the process of creating table designs by assigning specific fields or attributes to each table in the database. A table design specifies the fields and identifies the primary key in a particular table or file. The three normal forms constitute a progression in which (5) represents the best design. Most business-related databases must be designed in that form.
1、A：data entity B：data structure C：file collection D：data definition2、A：data integrity B：the rigid data structure C：data redundancy D：the many-to-many relationship3、A：entity-relationship diagram B：data dictionary C：database schema D：physical database model4、A：Normalization B：Replication C：Partitioning D：Optimization5、A：standard notation form B：first normal form C：second normal form D：third normal form
