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Define query optimization.
Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
Normalize the given relation to 3NF, justifying each step
distributed quey processing
Describe multi key files
Define an abstraction by which relationships are treated as higher level entities Ans: Aggregation. It is an abstraction by which relationships are treated as higher level
What sorts of tables one can se in designing the hierarchy of a LDB? Tables, which are having Foreign Key relations.
how to find entities
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
Given the following set of functional dependencies {cf→ bg, g → d, cdg → f, b → de, d → c} defined on R(b,c,d,e,f,g) a. Is cf→ e implied by the FDs? b. Is dg a superkey?
recovey techniques based on deferred update and immediate update
Explain degree of relation? Degree of a Relation - The degree or arity of a relation is the number of attributes n of its relation schema.
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