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What is candidate key?
Candidate Key - A candidate key of an entity set is a minimal superkey, which uniquely identifies each row in the relation.
What is indexed sequential file organization? What are the applications of this organization? Ans: An index file can be employed to effectively overcome the problem of storing
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
Multilevel Index The Multilevel Index is a modification of the secondary level index system. In this system we might be use even more number of levels in case the table is eve
What are the types of reference?explain it with suitable examples? Object oriented language given the ability to refer the object attribute of the type can be referred to the s
Speedup Query Processing: A query that includes data at various sites can be split into sub-queries. These sub- queries can be implemented in parallel by various sites. Such parall
Define the concept of aggregation. Give two examples where this concept is useful. Ans: Aggregation transforms a relationship among the objects into a higher-level object. A
Part: Recommended (Non-query) Optimisations This section entitled "Recommended (non-query) optimisations" should be a brief report containing recommended optimisations you would
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
Selective replication: This is a combination of generating small fragments of relation and replicating them rather than a entire relation. The data should be fragmented on require
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