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Consider a relation s over the attributes A and B with the following characteristics:
(a) Assuming that the aforesaid index on A is unclustered, estimate the number of disk accesses needed to compute the range query σA>1000 ^ A<6000 (s).
(b) What would be the cost if the above index were clustered? Explain your reasoning.
What sorts of tables one can se in designing the hierarchy of a LDB? Tables, which are having Foreign Key relations.
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Benefits of Hashed file Organisation 1. Insertion or search on hash-key is quick. 2. Best if equality search is required on hash-key. Drawbacks of Hashed file
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explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
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