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Structured Query Language (SQL) Server provides a robust variety of backup types that facilitate sustainable database management. SQL Server backups are segregated into three primary categories: Full backups, Differential backups, and Transaction Log backups. An understanding of these categories helps to devise effective strategies for data recovery.
1. Full Backups
Full backup in SQL Server is the most comprehensive type of backup. It creates an entire copy of the database, and acts as the starting point for both differential and transaction log backups.
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-- Code to perform a Full Backup BACKUP DATABASE [YourDatabase] TO DISK = 'D:\Backups\YourDatabase.bak' WITH FORMAT; |
2. Differential Backups
Differential backup is a type of backup that captures only the data changes made since the last full backup. It is quicker and requires less storage than a full backup but requires the last full backup in order to restore the database.
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-- Code to perform a Differential Backup BACKUP DATABASE [YourDatabase] TO DISK = 'D:\Backups\YourDatabase_Diff.bak' WITH DIFFERENTIAL; |
3. Transaction Log Backups
A Transaction Log backup captures all the transaction logs since the last log backup and allows you to restore your database to a particular point in time. It’s important for databases where data recovery is critical and you cannot afford to lose any data.
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-- Code to perform a Transaction Log Backup BACKUP LOG [YourDatabase] TO DISK = 'D:\Backups\YourDatabase_Log.trn'; |
Conclusion
Understanding the different SQL Server backup types is key to developing a strong database backup strategy. Each of these backups – Full, Differential, and Transaction Log, have their unique advantages and can be used based on the requirements and the environment.