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Define the terms i) Key attribute ii) Value set
Key attribute: An entity type usually has an attribute whose values are exact from each individual entity in the collection. Such an attribute is known as a key attribute.
Value set: Each easy attribute of an entity type is associated with a value set that states the set of values that might be assigned to that attribute for every individual entity.
Explain the disadvantages of file oriented approach? In the oriented approach Applications are designed in isolation. Design of application is optimized for one application. In
What is the main goal of RAID technology? Describe the levels 1 through 5. RAID stands for Redundant Array of Inexpensive (or sometimes "Independent")Disks. RAID is a met
Improved availability: The data in a distributed system may be replicated so that it is at more than one site. Thus, the failure of a node or a communication link does not necessar
Problem 1 Why are the operational system keys not recommended for forming data warehouse primary keys? Give any two examples 2 Explain the following performance tuning techn
Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1
Explain the two constraints, check and foreign key in SQL along with an example for each. Give the syntax. CHECK constraint - CHECK constraint specifies an expression which
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
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What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table EMPNO ENAME MGRID
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