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Oracle Interview Questions and Answers

Ques 26. What is an Integrity Constrains?

Ans. An integrity constraint is a declarative way to define a business rule for a column of a table.

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Ques 27. What is an Index?
Ans. An Index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval. Index can be created on one or more columns of a table.
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Ques 28. What is an Extent?
Ans. An Extent is a specific number of contiguous data blocks, obtained in a single allocation, and used to store a specific type of information.
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Ques 29. What is a View?
Ans. A view is a virtual table. Every view has a Query attached to it. (The Query is a SELECT statement that identifies the columns and rows of the table(s) the view uses.)
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Ques 30. What is Table?
Ans. A table is the basic unit of data storage in an ORACLE database. The tables of a database hold all of the user accessible data. Table data is stored in rows and columns.
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