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What is a recovery scheme?
An integral part of a database system is a recovery scheme that can restore the database to the reliable state that existed before the failure.
Emergence of Client Server Architecture Some of the pioneering work that was completed by some of the relational database vendors permitted the computing to be distributed on m
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
What is a query tree? Ans: A query tree, as well known as operator graph, is a tree data structure that corresponds to a relational algebra expression. It denotes the inpu
How nulls are treated in comparison operator? Along with comparison (relational) operators, the null values are ignored as we cannot derive the relation along with the given op
WHAT IS DSS? WRITE ITS REQUIREMENTS.
explain external view
Failures and Recovery In practice various things might occur to prevent a transaction from completing. Recovery methods are used to bring database, which does not satisfy consi
Load sample data into the database tables design and test queries to return the following information • All rows and columns for employees • All rows and columns for customers •
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
Consider an information system designed for an online company which provides IT products and services. These include desktops, laptops, networking products, IT books, parts, and te
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