Databases

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Pre-written Papers:

Title: Databases

Essay Details:

Subject: Technology

Author: Bryan A

Date: January 8, 2015

Level:

Grade: B

Length: 3 / 857

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." For example, in an employee database, some users may be able to view salaries while others may view only work history and medical data. *Data Integrity* The DBMS can ensure that no more than one user can update the same record at the same time. It can keep duplicate records out of the database; for example, no two customers with the same customer number can be entered...

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