26.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 stored 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 entities . It provides an overall view of the system and a blueprint for creating the physical data structures.（ ）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（ ）represents the best design. Most business-related databases must be designed in that form.
问题1
A.data entity
B.data structure
C.file collection
D.data definition
问题2
A.data integrity
B.the rigid data structure
C.data redundancy
D.the many-to-many relationship
问题3
A.entity-relationship diagram
B.data dictionary
C.database schema
D.physical database model
问题4
A.Normalization
B.Replication
C.Partitioning
D.Optimization
问题5
A.standard notation form
B.first normal form
C.second normal form
D.third normal form
