Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Concept explainers

Cryptography
Cryptography is a term used in computer science to describe secure information and communication techniques that transform messages in difficult-to-decipher ways using mathematical concepts and a set of rule-based calculations known as algorithms.
Question

Define backup. Explain what it means to back up a file. Define restore. Mention media used

to store backups. Tell why backup copies often are kept offsite. Virus protection is important in

the backup process. If the primary data source is infected, the mirror-image backups also will be

contaminated. Explain how a full backup (sometimes called an archival backup) is different from

a selective backup. Describe a three-generation backup policy. Define grandparent, parent, and

child. Point out where backup and restore programs are available. Describe an online backup

service.

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