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Database Introduction

What is data integrity?

Why are the end-users usually concerned with logical files instead of physical files?

What is data redundancy?

State the relationship between data and information?

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    1 decade ago
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    Data integrity is a term used in computer science and telecommunications that can mean ensuring data is "whole" or complete, the condition in which data are identically maintained during any operation (such as transfer, storage or retrieval), the preservation of data for their intended use, or, relative to specified operations, the a priori expectation of data quality. Put simply, data integrity is the assurance that data is consistent and correct

    http://en.wikipedia.org/wiki/Data_integrity

    From end-users point of view, they don't know how data are being stored physically, so they only concern how they can add, modify & retrieve data, instead of how it is physically stored on storage device.

    Data redundancy sometime refers to in computer data storage, is a property of some disk arrays (most commonly in RAID systems) which provides fault tolerance, so that all or part of the data stored in the array can be recovered in the case of disk failure. The cost typically associated with providing this feature is a reduction of disk capacity available to the user, since the implementations require either a duplication of the entire data set, or an error-correcting code to be stored on the array.

    Redundancy is attained when the same data values are stored more than once in a table, or when the same values are stored in more than one table

    http://en.wikipedia.org/wiki/Data_redundancy

    Information as a concept has a diversity of meanings, from everyday usage to technical settings. Generally speaking, the concept of information is closely related to notions of constraint, communication, control, data, form, instruction, knowledge, meaning, mental stimulus, pattern, perception, and representation.

    http://en.wikipedia.org/wiki/Information

    Simply speaking, information has a meaning various data do not have meaning until a meaning is applied to it, and make it becomes information.

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