How to Create a Differential Backup in SQL

Creating a Differential Backup

Write a SQL query to create a differential backup of a database.

Solution:

-- Create a differential backup of the MyDatabase database.
BACKUP DATABASE MyDatabase
TO DISK = 'C:\Backups\MyDatabase_Diff.bak'
WITH DIFFERENTIAL, INIT;

Explanation:

• Purpose of the Query :
• The goal is to demonstrate how to create a differential backup to capture changes since the last full backup.
• Key Components :
• WITH DIFFERENTIAL: Indicates that only changes since the last full backup are included.
• INIT: Ensures the backup overwrites any existing file at the specified location.
• Why Use Differential Backups?:
• Differential backups reduce backup size and time compared to full backups.
• They complement full backups by capturing recent changes.
• Real-World Application :
• In high-transaction systems, differential backups are scheduled daily to minimize storage overhead.

Notes:

• Differential backups require a full backup as a base for restoration.
• Combine with transaction log backups for comprehensive recovery.
• Ensure sufficient storage for multiple differential backups.

For more Practice: Solve these Related Problems:

• Write a SQL query to create a differential backup of a database named "SalesDB" after a full backup has been taken earlier in the day.
• Write a SQL query to create a differential backup of a database named "HRDatabase" and verify its integrity immediately after creation.
• Write a SQL query to create a differential backup of a database named "InventoryDB" and append it to an existing backup set.
• Write a SQL query to create a differential backup of a database named "FinanceDB" and compress the backup file to save disk space.

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Previous SQL Exercise: Restoring a Database from a Full Backup.
Next SQL Exercise: Restoring a Database Using Full and Differential Backups.