SQL Server Tutorial: Differential Backup Explained
In this SQL Server tutorial video we'll explain differential backups to help you in your database backup and recovery tasks. Of course, database backup and recovery in dbms is nothing new to any DBA or developer, but a differential backup is something you should certainly be aware of.
Differential backups are backups that back up data that has changed since the last full backup.
To create such a database backup (a differential database backup), first create a full backup, then create a differential backup on the basis of the full backup.
To create a full backup, run this SQL query:
BACKUP DATABASE [dbname] TO DISK = 'C:\backup.bak'
Then, to restore a differential backup, run this SQL query:
RESTORE DATABASE [dbname] FROM DISK 'C:\backup.bak' WITH NORECOVERY, REPLACE RESTORE DATABASE [dbname] FROM DISK 'C:\differential.bak'
In the SQL query above, replace 'backup.bak' with the name of your full backup, and replace 'differential.bak' with the name of your differential backup. Also, make sure to specify the "WITH NORECOVERY" option when taking a full database backup.
We hope that this SQL Server tutorial will help you answer some of the sql interview questions and answers you may face in your next SQL interview!
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