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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.
From SAD to OOAD (Structured Analysis and Design (SAD) to Object Oriented Analysis and Design (OOAD). We will find here how we can map various models in SAD to different model
Benefits: It limits data access. It makes difficult queries look easy. It permits data independence. It presents dissimilar views of the similar data.
how design database from begining
Give an example of multiple inheritance. One example of multiple inheritance is a committee for students affair which include faculty and administrative staff member.
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