viewquestions/12423/Define the following with examples Database Management Systems 10CS54 VTU notes 10 marks Dec 14Jan 15

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Explain any Two informal quality measures employed for a relation schema Design? Database Management Systems - 10CS54 VTU notes ( Jan 2013/June 2016)

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Informal Design Guidelines are:- Semantics of the Relation Attributes Redundant Information in Tuples and Update Anomalies Null Values in Tuples Spurious Tuples Informally, each tuple in a relation should represent one entity or relationship instance. (Applie to individual relations and their attributes). Attributes of different entities (EMPLOYEEs, DEPARTMENTs, PROJECTs) should not be mixed in the same relation Only foreign keys should be used to refer to other entities Entity and relationship attributes should be kept apart as much as possible. Bottom Line: Design a schema that can be explained easily relation by relation. The semantics of attributes should be easy to interpret.


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