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What are the technique to define a schema completely ?
A schema is completely define by DDL and DML query language.
It defines that the tuple in one relation that refers to another relation must refer to an existing tuple in that relation. This constraint is states on two relations (not essentia
Explain Authorization and Integrity Manager ? Authorization and Integrity Manager: Tests for the satisfaction of integrity constraints and checks the authority of users to acce
What sorts of tables one can se in designing the hierarchy of a LDB? Tables, which are having Foreign Key relations.
Question 1 Indexes are ocasionally defines on a single field of a file called an indexing field. List and describe the different types of indexes Question 2 Consider a book i
what are the topics in data management
Explain Thomas' Write rule. Show how it is different from timestamp ordering protol Ans: In timestamp-based concurrency control the thomas Write rule is a rule. Given a Timest
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System Design: An Object Oriented Approach Any software systems always try to change and evolve as technology and business rules evolve. The development of information systems
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
What is known as a search key? An attribute or set of attributes used to look up records in a file is known as a search key.
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