Chapter 1: Introduction

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2. DATABASE MANAGEMENT SYSTEM (DBMS)

Protection against unauthorized access: either intentional or accidental.

Batch Processing

Shared Updates: Solution

Batch Processing

Allow multiple users to retrieve data simultaneously
Updates are added to a batch file which does the appropriate processing
Does not work for real time situations

Locking

Restrict access to the record being updated by a user till the transaction is complete.

Protection against unauthorized access: either intentional or accidental.

Security

Protection against unauthorized access: either intentional or accidental.
Three main features for protection

Passwords: Allows only authorized users to access the database. Access privileges can be provided based on access needs
Encryption: Encodes data to non-decipherable. Data decoded on demand to prevent hackers from accessing data
Views: Different snapshot of the data ensures that users only get access to data they need

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