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Normalization

Normalization. Anomalies Boyce-Codd Normal Form 3 rd Normal Form. Anomalies. Goal of relational schema design is to avoid anomalies and redundancy. Update anomaly : one occurrence of a fact is changed, but not all occurrences. Deletion anomaly : valid fact is lost when a tuple is deleted.

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Rules for Reasoning about MVDs

Rules for Reasoning about MVDs. Use to identify the MVDs (e.g., from FD to MVD) which are necessary for the decomposition of a relation into 4NF. V W is X Y with X=V ?W and X?Y=W.

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99 views • 4 slides

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Normalization

Rules for Reasoning about MVDs