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Describe five main functions of a database administrator.
Ans: A database administrator (DBA) is a person who is accountable for the environmental aspects of a database. Generally, these include:
a) Recoverability - Creating and testing Backups
b) Integrity - Verifying or helping to verify data integrity
c) Security - Defining and/or implementing access controls to the data
d) Availability - Ensuring maximum uptime
e) Performance - Ensuring maximum performance
f) Development and testing support - Helping programmers and engineers to efficiently utilize the database.
What is called as an N-way merge? The merge operation is a generalization of the two-way merge used by the standard in-memory sort-merge algorithm. It merges N runs, so it is k
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
FDs in Entities : Student entity : Enrolment number → Student name, Address Course Entity :
random file orgnization
What are views? Explain how views are different from tables? A view in SQL terminology is a one table in which is derived from other tables. These other tables could be base t
Define the terms i) Entity type ii) Entity set Entity type: An entity type describes a collection of entities that have the similar attributes. Entity set: The set of all en
differences between a classified catalog and a dictionary catalog
The data of a view is not physically stored, but derived from one or more tables. True the data of a view is not physically stored
Advantages of Observation Methods: Bailey has pointed out four advantages of observation: 1. Superior in Data Collection on Non Verbal Behavior: When a person a opi
What is substitutability? Any method of a class-say A can equally well be adjured with any object belonging to any subclasses B of A. This characteristic leads to code reuse, a
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