Database Security
Database Security
A database is an organized collection of data that is stored electronically and can be easily searched, updated, and managed.
Think of a database as a digital filing cabinet.
Examples of data stored in databases:
Customer records
Employee information
Product inventories
Bank accounts
Medical records
Student data
Database Example
Customer Table
CustomerID Name City1001 John Smith Chicago
1002 Jane Doe Aurora
1003 Mike Jones Dallas
Instead of searching through paper files, a database can find information in seconds.
Components of a Database
Table
A table stores data in rows and columns.
Plain Text
Customers Table
`
ID Name Phone1 John 555-1234
2 Jane 555-5678
Row (Record)
A single entry in a table.
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1 | John | 555-1234
One row = one customer.
Column (Field)
A category of information.
Examples:
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Name
Phone
Address
Email
Primary Key
A unique identifier for each record.
Example:
Plain Text
CustomerID
No two records should have the same primary key.
What is SQL?
SQL (Structured Query Language) is the language used to communicate with relational databases.
SQL allows you to:
Retrieve data
Insert data
Update data
Delete data
Create databases and tables
Common Database Systems
Microsoft SQL Server
MySQL
PostgreSQL
Oracle Database
SQLite
Basic SQL Commands
SELECT
Retrieves data.
SQL
SELECT * FROM Customers;
Result:
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Shows all customers
WHERE
Filters data.
SQL
SELECT * FROM Customers
WHERE City = 'Chicago';
Shows only customers in Chicago.
INSERT
Adds new records.
SQL
INSERT INTO Customers
(Name, City)
VALUES
('John Smith', 'Aurora');
UPDATE
Changes existing records.
SQL
UPDATE Customers
SET City = 'Dallas'
WHERE CustomerID = 1001;
DELETE
Removes records.
SQL
DELETE FROM Customers
WHERE CustomerID = 1001;
Relational Databases
Most enterprise databases are relational databases.
Tables are linked together using keys.
Example:
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Customers
|
Orders
|
Products
This allows data to be organized efficiently.
What is Database Security?
Database security is the protection of databases and the data they contain from unauthorized access, theft, misuse, corruption, or destruction.
The goal is to protect:
Confidentiality
Integrity
Availability
(CIA Triad)
Common Database Threats
Unauthorized Access
Someone gains access to the database without permission.
Example:
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Hacker accesses customer records
Data Theft
Attackers steal:
Credit card numbers
Social Security numbers
Medical records
Customer data
Insider Threats
Employees misuse their access.
Example:
Plain Text
Employee downloads customer database
without authorization.
Database Malware
Malicious software that targets database servers.
Ransomware
Attackers encrypt the database and demand payment.
Plain Text
Database Locked
↓
Pay Ransom
SQL Injection
One of the most important database attacks to know.
Attackers insert malicious SQL commands into application input fields.
Example:
Instead of entering:
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John
an attacker enters malicious SQL code.
If the application is poorly written, the database may execute the attacker's command.
Potential consequences:
Stolen data
Deleted records
Administrator access
Database Security Controls
Authentication
Verifies user identity.
Examples:
Username/password
MFA
Smart cards
Authorization
Controls what users can access.
Example:
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HR Database
Accessible only to HR employees.
Role-Based Access Control (RBAC)
Permissions are assigned based on job roles.
Example:
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DB Administrator
Can modify the database.
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Employee
Can only view certain information.
Encryption
Protects sensitive data.
Data at Rest
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Stored Database Files
Encrypted on disk.
Data in Transit
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Client
|
TLS Encryption
|
Database Server
Protects network traffic.
Backups
Regular backups allow database recovery.
Protects against:
Hardware failures
Ransomware
Human error
Auditing and Logging
Tracks database activity.
Example:
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Who accessed records?
What changed?
When did it happen?
Useful for investigations and compliance.
Database Administrator (DBA)
A Database Administrator (DBA) manages databases.
Responsibilities:
Backups
Security
Performance tuning
User permissions
Database maintenance
Database Security Best Practices
✅ Use strong authentication
✅ Enable MFA
✅ Apply least privilege
✅ Encrypt sensitive data
✅ Patch database software
✅ Use secure coding techniques
✅ Prevent SQL injection
✅ Monitor logs
✅ Perform regular backups
✅ Audit access regularly
Security+ / Network+ Exam Tips
Remember
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Database = Organized Data Storage
SQL = Language Used to Manage Databases
`
Important SQL Commands
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SELECT = Read
INSERT = Add
UPDATE = Modify
DELETE = Remove
Key Security Concepts
Authentication
Authorization
RBAC
Encryption
Backups
SQL Injection
Auditing
Quick Memory Trick
Plain Text
SQL =
Search
Query
List
(An easy way to remember its role in retrieving and managing data.)
Simple Definition
A database is an organized collection of electronic data. SQL (Structured Query Language) is the language used to manage and query databases. Database security is the set of controls, policies, and technologies that protect databases and their data from unauthorized access, attacks, data loss, and corruption.
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