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What is a shadow copy scheme? It is simple, but efficient, scheme known as the shadow copy schemes. It is based on making copies of the database called shadow copies that singl
What is conceptual model ? A conceptual model is a independent of both hardware and software.
In a relational model how relations are termed? In a relational model, relations are termed as tables. (The term ‘relation’ is the technical name of the ‘table’ in RDBMS)
Define entity integrity and referential integrity. How does SQL allow specification of these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut
Differentiate between join and outer join? Outer joins return all rows from at least one of the tables or views mentioned within the FROM clause, as long as those rows get toge
design a generalization specialization hierarchy for a motor vehicle sales company. the company sells motorcycles, passenger cars, vens and buses.
Types of Locks There are two necessary types of locks: Binary lock : This locking mechanism has two states for to a data item: locked or unlocked Multiple-mode loc
What is the main advantage of the object model? What are its different components? The object model focuses on the logical data structures. Each object model comprises of many
A database to track your progress in your college program will track your progress towards graduation! A database that has information containing the classes that you have taken, c
Write a query to define tables students and teachers as sub tables of people? Create table students of student under people Create table teachers of teacher under people
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