![]() ![]() In order to prevent your transaction logs from growing to enormous sizes and potentially filling up your disk drive, you need to perform regular transaction log backups. If you are using the Full Recovery model for your database, you should keep in mind that the transaction log continues to store information as changes are made to the database. As an example, if you run transaction log backups every 30 minutes, you can recover a database to the 15-minute mark within a transaction log backup before that delete or update statement incorrectly changed data in the database. With the Full Recovery model, you can recover your database to any point in time within a transaction log backup. The database recovery model determines the following: There are three types of SQL Server database recovery models: Simple, Full and Bulk-Logged. Restore transaction log backups in sequence made from the last full backup (or from the last differential backup if you are using them) and the failure.(Optional) Restore the differential backup that is closest to the moment of failure.To perform a point-in-time restore you’ll have to do the following: If you are performing regular transaction log backups, you can recover to a point right before a problematic transaction occurred, such as an incorrect deletion or update of data in a table. The image below illustrates how your backup chain might look if you use all three types of backup described above. ![]() You can perform a transaction log backup as often as every few minutes, which will allow you to perform a point-in-time restore and minimize data loss.įurther reading SQL Server Transaction Log Backup This will allow you to restore your data to a more current state than if you had only a full backup of the database that was not created as recently.Ī transaction log (T-log) backup is the most granular backup type in SQL Server because it backs up the transaction log which only contains the modifications made to the SQL Server database since the last transaction log backup. If a database restore is needed, you’ll need to restore the full backup and the differential backup that is closest to the time at which the issue occurred (all of the other differential backups can be ignored). Learn more about differential backups and see how to perform them using built-in SQL Server tools and MSP360 Backup in this article:įurther reading SQL Server Differential Backup To prevent longer backup times and keep differential backups from getting too large, you need to run new full backups at regular intervals. It might eventually approach the size of the full backup, which will lead to longer restore times (since the full plus the differential backup must be restored). However, when you create multiple differential backups, each subsequent differential backup contains additional modified data compared to the previous ones, and is, therefore, larger in size. Creating differential backup usually takes less time than a full backup, because you back up only modified data instead of backing up everything. Differential BackupĪ differential backup contains only the data that has been changed since the last full database backup was created. With a full backup, you will be able to restore a database in exactly the same form as it existed at the time of the backup.Ī full backup is the foundation for every other backup type it must be performed at least once before you can run any of the other types of backups. However, if you would like to simplify your backup management, as well as use cloud or hybrid backup storage, see how MSP360 Backup can help you in this article:įurther reading SQL Server Database Backup with MSP360 You can create a full SQL Server database backup using SQL Server Management Studio, Transact-SQL, or PowerShell (Microsoft offers a detailed guide here). It backs up all of the objects of the database: tables, procedures, functions, views, indexes, etc. Full BackupĪ full backup is a complete backup of your SQL Server database. We will focus on the first three types in this article, as they are the most common. Microsoft SQL Server supports five types of backup: full, differential, transaction log, tail log, and copy-only backup. For details on the topics discussed below, refer to the articles that each section links to. The goal of this article is to provide a high-level overview of SQL Server database backup and restore, and outline backup best practices. In this guide, we will discuss SQL Server backup types, recovery models, as well as best practices that you should take into account when putting together your backup strategy. SQL Server Backup and Restore: Overview and Best Practices
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