Title: Databases

Essay Details

Subject: Technology
Author: Bryan A
Date: January 8, 2015
Level:
Grade: B
Length: 3 / 857
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Essay text:

Adding a field to a record does not require changing any of the programs that do not use the data in that new field. *Major Features of a DBMS * *Data Security* The DBMS can prevent unauthorized users from viewing or updating the database. Using passwords, users are allowed access to the entire database or a subset of it known as a "subschema...

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It can keep duplicate records out of the database; for example, no two customers with the same customer number can be entered. *Interactive Query* Most DBMSs provide query languages and report writers that let users interactively interrogate the database and analyze its data. This important feature gives users access to all management information as needed...

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