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What is meant by heuristic optimisation? Discuss the main heuristics that are applied during query optimisation.
Ans: In heuristic optimization, heuristics are employed to reduce the cost of optimization in place of analyzing the number of different plans to make out the optimal plan. For instance, a heuristic optimizer would make use of the rule 'Perform selection operation as early as possible' without finding out whether the cost is reduced by this transformation. Heuristics approach generally assists to reduce the cost but not all the time. The major heuristics that are applied throughout query optimization are:
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
What is a function group? A function group is a collection of logically related modules that share global data with every other. All the modules in the group are contained in
Assigning Responsibility for Operation Many operations might have obvious target objects, but some of these operations could be used at numerous places in an algorithm, by one
explain the steps for reduction of er model into relational model?
The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
as a customer service employee, explain five measures you would recommend a displeased student to patronise a school canteen
An Enterprising group of Entrepreneurs introduced a new business named StoreItRite which is based on data storage and retrieval services. It provides the services and the company c
What is a value? A data value is used for identity. This form of identity is used in relational systems.eg: The primary key value of a tuple recognize the tuple.
Serialisability: Any schedule that makes the similar results as a serial schedule is known as a serialisable schedule. But how can a schedule are determined to be serialisable or n
Attributes and its types explain?
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