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What is a SELECT operation?
The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.
Define physical and logical data independence. How does this architecture help in achieving these? Data independence entails that change in one view must not need a change in t
What is the most significant feature that does not directly map into programming language structures? Why? Association, since there are complex types of association, like as qu
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
What is OLAP? OnLine Analytical Processing (OLAP) is a Business Intelligence (BI) reporting system. OLAP gives the user with the capability to sum, count, average and do other
What are called multilevel indices? Indices with two or more levels are known as multilevel indices.
examples of fields in a database
Question: (a) What are decision support systems, and what role do they play in the business environment? (b) Data mining is a knowledge discovery process of automated extr
write-set(T): Each data items that are written by a transaction T
What are the drawbacks of shadow-paging technique? The drawbacks of shadow paging is:- a) Commit Overhead b) Data fragmentation c) Garbage collection
what do you mean by primary key constraint?
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