A data model is a notation(符号) for describing data or model(概念模型)Database data model: the description generally consists of three parts:Structure of the datarelational model = tables network and hier
It ismon for an initial relational schema to have room for improvement especially by eliminating redundancy(消除冗余).There is a design theory for relations that lets us examine a design carefully and
Database SystemsA DBMS is expected to:Enable durability(持久): the recovery of the database in the face of failures(故障) errors of many kinds or intentional Data sharing(共享): control access to data from
1Thomas M. Connolly et al. Database Systems: A practical approach to Design Implementation and Management. 4th Edition ISBN: 0321210255 Addison-Wesley 2004 ORThomas M. Connolly et al. Database Systems
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