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Explain the term- Periodic recomputation
Periodic recomputation: Base values are often updated in bunches. Sometimes, it is possible to just recompute all derived attributes periodically without recomputing derived attributes after each base value is altered. Recomputation of all the derived attributes can be more proficient than incremental update since some derived attributes may depend on many base attributes and might be updated more than one time by an incremental approach.
Also, periodic recomputation is easier than explicit updates and less prone to bugs. While, if data set changes incrementally, some objects at a time, periodic recomputation is not practical since too many derived attributes may be recomputed when only a little are affected.
to develop elrctronic database from manual forms
What are the Objectives of object design After going through this unit, you could be able to: explain steps of object design; discuss algorithms that reduce costs;
what is meant semantic query optimization? how does it differ from other query optimization techniques?
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Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
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