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Define upgrade and downgrade? It gives a mechanism for conversion from shared lock to exclusive lock is called as upgrade. It gives a mechanism for conversion from exclusive
how design database from begining
differences between a classified catalog and a dictionary catalog
What is assertion? Mention the forms available. An assertion is a predicate expressing a condition that we wish the database always to satisfy. Domain integrity constraints.
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.
What type of view of total database content? Data base content Conceptual view of total database contain.
explain participation constraints with examples
Type of views : Simple views and Difficult Views Feature Simple Views Complex Views Number of tables One
Benefits of Hashed file Organisation 1. Insertion or search on hash-key is quick. 2. Best if equality search is required on hash-key. Drawbacks of Hashed file
Why were functional methods fashionable in early days? These are inspired directly by computer architecture and thus popular among computer scientist in early days. The divisio
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