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The full recovery model is the best possible option to prevent data loss. The full recovery model requires database and transaction log backups. The full recovery model also provides protection against media failure. To ensure that you do not lose transactions, you should host the transaction log on a fault-tolerant volume such as RAID 1 or RAID 5. SQL Server 2005 allows you to back up the transaction log during a normal data or differential backup. The Enterprise Edition of SQL Server 2005 allows you to restore a database without the necessity of taking it offline. You can perform an online restore using SQL Server Enterprise Edition only if you have configured the database to use the full or bulk-logged recovery models.
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The bulk recovery model is a subset of the full recovery model. Under this model, SQL Server minimally logs bulk operations such as index creation or bulk imports. This arrangement improves performance and log space consumption; otherwise, SQL Server would need to enter each individual transaction in its entirety into the log. The drawback of the minimal logging of such operations is that only minimal records of the individual transactions that occur in the bulk operation exist. This means that it is impossible for you to perform a point-in-time restore. When a log backup contains bulk-logged operations, you can recover the database only to the end of the log backup. If something goes wrong in the middle of the bulk operation, it is impossible for you to run the log forward to a point just prior to the failure. The bulk-logged recovery model is in some respects an all-or-nothing approach. To back up a log that contains bulk-logged operations, you need access to the data files that contain the bulk-logged transactions. This added data can make the log backup large. Before implementing the bulk recovery model, you should be aware of the following restrictions:
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If you make a filegroup containing bulk-logged changes read-only before performing a log backup, all subsequent log backups of that filegroup will contain the extents changed by the bulk operation as long as the filegroup remains readonly. A way of avoiding this limitation is to implement the full recovery model prior to making the filegroup read-only and backing up the log. After the backup is finished, you should then make the filegroup read-only.
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If a log backup contains bulk-logged changes, you cannot perform a point-intime recovery. If bulk operations are performed while the bulk-logged recovery model is implemented, all files must be online or defunct during log backup. Online restore sequences work only if all log backups were taken prior to the damage and the bulk changes were backed up prior to starting the online restore sequence.
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Configuring a database to use a specific recovery model is relatively simple. To configure a database s recovery model, perform the following steps: 1. Open SQL Server Management Studio. 2. Expand the Databases folder. 3. Right-click the database for which you want to configure the recovery model, and choose Properties. 4. In the Select A Page pane, select the Options page. 5. Use the Recovery Model drop-down list to select the chosen recovery model, as shown in Figure 4-3. Click OK to save your changes.
Figure 4-3
Configuring file recovery options.
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Disaster Recovery
Quick Check
1. What factors can make a bulk recovery log backup large 2. Which recovery model should you use if it is always necessary to restore to a particular named transaction 3. In what situation should you NOT use the REINSTALL=ALL and REINSTALLMODE=OMUS repair options
Quick Check Answer
1. Bulk recovery logs require access to the data files that contain the bulklogged transactions. 2. The full recovery model should be used in this situation. 3. You should NOT use these repair options if you are unaware of which package options were used for the SQL Server installation.
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