Configuring SQL Server 2005 in .NET framework

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Configuring SQL Server 2005
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Lesson 3: Specifying a Recovery Model
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A recovery model is a database configuration option that controls how transactions are logged, whether the transaction log is backed up, and what restore options are available for the database. The recovery model you choose for your database has both datarecovery implications and performance implications, based on the logging the recovery model performs or doesn t perform.
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After this lesson, you will be able to:
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Explain the differences between the recovery models. Choose the best recovery model for each SQL Server 2005 database.
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Estimated lesson time: 10 minutes
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Recovery Models Overview
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SQL Server 2005 provides three recovery models for databases: Full, Simple, and Bulk-Logged. These models determine how SQL Server works with the transaction log and selects the operations that it logs and whether it truncates the log. Truncating the transaction log is the process of removing committed transactions and leaving log space to new transactions. The following is a definition of each recovery model:
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In the Full recovery model, the database engine logs all operations onto the transaction log, and the database engine never truncates the log. The Full recovery model lets you restore a database to the point of failure (or to an earlier point in time in SQL Server 2005 Enterprise Edition). In the Simple recovery model, the database engine minimally logs most operations and truncates the transaction log after each checkpoint. In the Simple recovery model, you cannot back up or restore the transaction log. Furthermore, you cannot restore individual data pages.
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IMPORTANT
Simple recovery model scenarios
The Simple recovery model is not appropriate for databases in which the loss of recent changes is unacceptable.
In the Bulk-Logged recovery model, the database engine minimally logs bulk operations such as SELECT INTO and BULK INSERT. In this recovery model, if a log backup contains any bulk operation, you can restore the database to the end of the log backup, not to a point in time. The Bulk-Logged recovery model is intended to be used only during large bulk operations.
Lesson 3: Specifying a Recovery Model
How to Configure Recovery Models
You can see the recovery model specified for a given database on the Database Properties page in SSMS or by querying the sys.databases catalog view, as this basic syntax shows:
SELECT name, recovery_model_desc FROM sys.databases
To configure the recovery model for a database, you can go to the Database Properties page in SSMS or use the ALTER DATABASE statement. In SSMS, you can change the recovery model by performing the following steps: 1. Expand the Databases node within Object Explorer in SSMS. 2. Right-click the database for which you want to set the recovery model and then choose Properties. Select the Options page. 3. You can change the recovery mode from the Recovery model drop-down list, as Figure 2-3 shows.
Figure 2-3
Changing the recovery model from SSMS
The basic syntax for configuring the recovery model using ALTER DATABASE is as follows:
ALTER DATABASE <database_name> SET RECOVERY FULL | SIMPLE | BULK_LOGGED
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Configuring SQL Server 2005
As noted earlier, Full recovery is the recommended model for a production database because it provides the most recoverable configuration. If you import data periodically by using a bulk mechanism, you can temporarily change the recovery model for your database to Bulk-Logged to get better bulk-load performance. Then, when the import process ends, return your database to the Full recovery model.
PRACTICE
Changing a Database s Recovery Model
In this practice, you will change the database recovery model to Bulk-Logged to get good performance for a bulk-logged operation and then revert to the Full recovery model. 1. Set the database recovery model for the AdventureWorks database to BulkLogged by executing the following ALTER DATABASE statement. (Before changing the recovery model, do a full backup of the database.)
-- Note that you should create the C:\Backup folder at Operating System level before running this backup. BACKUP DATABASE AdventureWorks TO DISK='C:\Backup\AdventureWorks.Bak' GO --Change the Recovery Model to Bulk Logged ALTER DATABASE AdventureWorks SET RECOVERY BULK_LOGGED
2. Type and then run the following ALTER DATABASE statement to change the recovery model back to Full after performing the bulk-logged operations; perform another full database backup so that you have a backup of the data that was just loaded:
ALTER DATABASE AdventureWorks SET RECOVERY FULL --Perform a Full database backup BACKUP DATABASE AdventureWorks TO DISK='C:\Backup\AdventureWorks.Bak' GO
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