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Describe domain constraints.
Domain constraints contain entity integrity and referential integrity. The domain is a set of values that might be assigned to an attribute. The entity integrity rule states that no part of a primary key cannot be null. Referential integrity states that every foreign key value must match a primary key value or be null.
Define rotational latency time. The time spent waiting for the sector to be accessed to appear under the head is known as the rotational latency time.
Question: Consider the following database relations for a textbook ordering system used by a college bookshop: Book (b-copy#, bname, ISBN#, author, price, subject) Order (s#
What are the requirements to ensure the objectives of file management principle is realized?
Answer SQL Queries to extract data from data tables and questions on mapping conceptual data models into relational data model.
Which database object does not physically exist? A view database object does not physically exist.
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
What are the technique to define a schema completely ? A schema is completely define by DDL and DML query language.
The following variant of the primary copy asynchronous-update replication protocol has been proposed for totally replicated systems. (a) A transaction executing at site A updat
Question (a) Concurrent access to data from a database is a normal part of application program usage. Describe three approaches to concurrency control (b) Distinguish among
In E-R diagram how generalization is represented? in E-R diagram generalization is represented by Triangle shape.
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