Why is Database Testing Important?

• Ensuring Data Accuracy – Verifying correct data storage and retrieval.
• Verifying Data Integrity – Maintaining data consistency and correctness.
• Ensuring Security – Preventing unauthorized data access.
• Checking Performance – Ensuring efficient database operations.

Types of Database Testing

Some types of database testing are as follows:

Functional Testing

Checks if the database operations meet business requirements.

Data Integrity Testing

Ensures stored data is correct and consistent across tables.

Performance Testing

Tests database speed and efficiency under load.

Security Testing

Ensures only authorized users can access sensitive data.

Common Database Testing Methods

1. Using SQL Queries

Testers write SQL queries to verify database functionality.

SELECT * FROM users WHERE email = 'test@example.com';

2. Automated Testing Tools

• Selenium with JDBC – Automates database verification.
• SQLUnit – A unit testing framework for databases.
• DbUnit – Helps in test data management.

Steps to Perform Database Testing

• Understand Requirements – Define expected behavior.
• Prepare Test Data – Create sample records.
• Execute SQL Queries – Run queries for validation.
• Validate Results – Compare actual vs. expected results.
• Report Issues – Log and fix database errors.

Example of Database Testing

Testing a banking application where a deposit updates the account balance.

Initial Balance: $1,000

Deposit Amount: $200

SQL Query to Verify Balance Update

SELECT balance FROM accounts WHERE account_number = '123456789';

Expected Result: The new balance should be $1,200.