SQL Server Backup and Restore - Simple Talk

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Chapter 1: Basics of Backup and Restore Some DBAs avoid taking differential backups where possible, due to the perceived administrative complexity they add to the backup and restore strategy; they prefer instead to rely solely on a mix of full and regular transaction log backups. Personally, however, I find them to be an invaluable component of the backup strategy for many of my databases. Furthermore, for VLDBs, with a very large full backup footprint, differential backups may become a necessity. Even so, it is still important, when using differential backups, to update the base backup file at regular intervals. Otherwise, if the database is large and the data changes frequently, our differential backup files will end up growing to a point in size where they don't give us much value. We will discuss differential backups further in Chapter 7, where we will dive much deeper into best practices for their use as part of a backup and recovery strategy. SQL Server transaction log backups As a DBA, you will in many cases need to take regular backups of the transaction log file for a given database, in addition to performing database backups. This is important both for enabling point-in-time restore of your database, and for controlling the size of the log file. A full understanding of log backups, how they are affected by the database recovery model, and how and when space inside the log is reused, requires some knowledge of the architecture of the transaction log. We won't get to this till Chapter 5, so we'll keep things as simple as possible here, and get into the details later. Essentially, as discussed earlier, a transaction log file stores a series of log records that provide a historical record of the modifications issued against that database. As long as the database is operating in the FULL or BULK LOGGED recovery model then these log records will remain in the live log file, and never be overwritten, until a log backup operation is performed. 32
Chapter 1: Basics of Backup and Restore Therefore, the full transaction "history" can be captured into a backup file by backing up the transaction log. These log backups can then be used as part of a database RESTORE operation, in order to roll the database forward to a point in time at, or very close to, when some "disaster" occurred. The log chain For example, consider our previous scenario, where we were simply taking a full database backup once every 24 hours, and so were exposed to up to 24 hours of data loss. It is possible to perform differential backups in between the full backups, to reduce the risk of data loss. However both full and differential backups are I/O intensive processes and are likely to affect the performance of the database, so they should not be run during times when users are accessing the database. If a database holds business-critical data and you would prefer your exposure to data loss to be measured in minutes rather than hours, then you can use a scheme whereby you take a full database backup, followed by a series of frequent transaction log backups, followed by another full backup, and so on. As part of a database restore operation, we can then restore the most recent full backup (plus differentials, if taken), followed by the chain of available log file backups, up to one covering the point in time to which we wish to restore the database. In order to restore a database to a point in time, either to the end of a particular log backup or to a point in time within a particular log backup, there must exist a full, unbroken chain of log records, from the first log backup taken after a full (or differential backup), right up to the point to which you wish to recover. This is known as the log chain. If the log chain is broken (for example, by switching a database to SIMPLE recovery model, then it will only be possible to recover the database to some point in time before the event occurred that broke the chain. The chain can be restarted by returning the database to FULL (or BULK LOGGED) recovery model and taking a full backup (or differential backup, if a full backup was previously taken for that database). See Chapter 5, Log Backups, for further details. 33
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SQL Monitor SQL Server performance
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.NET Reflector ® Decompile, browse
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Brad's Sure Guide to SQL Server Mai
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