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Step-by-Step Approach to Differential Backup and Recovery

(SQL Server Magazine Via Acquire Media NewsEdge) Chris Burns Iain Kick Real-world SQL Server databases continue to get larger, often ranging into multiple terabytes in many production environments. There has also been a trend toward consolidating SQL Server environments to reduce costs and wasted resources. Consolidated environments consist of multiple databases on a single instance, multiple instances on one server, or virtualized servers. These very large databases (VLDBs) and consolidated environments present their own performance and management challenges, one of which is the ability to effectively provision for disaster recovery within the business service level agreements (SLAs) and maintenance windows. To help address some of these challenges, Microsoft introduced backup compression initially in SQL Server 2008 Enterprise Edition, then in SQL Server 2008 R2 Standard Edition. Backup compression provides significantly smaller and faster backups and restores in most environments.Compression requires less disk space to store the backups (and thus the ability to store more backups locally), less than the network bandwidth to move around backups, offsite storage than tape for archiving and faster backups to reduce the pressure on the maintenance windows. Basically, compressed backups also result in faster restores, which must often be made out for hours in a high pressure situation of disaster recovery. However, if the databases contain pre-compressed data (eg format as BLOB. Pdf and. Jpg), the benefits of compression may be very limited if not negligible. In addition, compressed backups come with a CPU overhead, which can be a significant problem in SharePoint environments, for example. SQL Server includes functionality for differential backups, which can provide additional disk and time savings for VLDBs and consolidated environments, particularly when they contain data that doesn't compress effectively. DBAs have been reluctant to use differential backups in the past, but it's a practice that DBAs need to understand and implement as databases grow larger and business SLAs can no longer be met. To this end, we'll discuss the concepts behind differential backups, how to take and restore differential backups, and when to use them. What Is a Differential Backup? The key to establishing a solid differential backup strategy is the ability to have confidence and reliability in the base of the differential, or differential base.

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