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BACKUP LOG AdventureWorks TO DISK = C:\TEST\AW3.TRN
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7. Insert another row into the dbo.t1 table. 8. Now perform a differential filegroup backup by executing the following command:
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BACKUP DATABASE AdventureWorks FILEGROUP = FG1 TO DISK = C:\TEST\FG1DIFF1.BAK WITH DIFFERENTIAL
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Lesson 1: Backing Up a Database
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9. Insert another row into the dbo.t1 table. 10. Execute the following command to perform another transaction log backup to capture the latest data change:
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BACKUP LOG AdventureWorks TO DISK = C:\TEST\AW4.TRN
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The backup engine in SQL Server 2005 provides a flexible set of tools to ensure that your data is backed up and available for restore to provide protection in case of a disaster. You can use full backups with differential and transaction log backups to capture the entire database as well as any changes occurring since the last full backup. You can use filegroup backups in conjunction with differential and transaction log backups to target portions of a database for backup. You can also mirror each type of backup to as many as three devices, enabling you to use a single command to create up to four equivalent backups simultaneously.
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The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
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NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. If you want to let a member of your technical support staff back up a database without having to grant any other permission to a database or SQL Server instance, to which role should you add the staff member A. db_accessadmin B. db_owner C. db_backupoperator D. sysadmin
11
Backing Up, Restoring, and Moving a Database
2. You perform a differential backup of the AdventureWorks database every four hours starting at 04:00, with a full backup being run at midnight. What data does the differential backup taken at noon contain A. The data pages that have changed since midnight. B. The extents that have changed since midnight. C. The data pages that have changed since 08:00. D. The extents that have changed since 08:00. 3. You perform a full backup of the AdventureWorks database that completes at midnight. Differential backups are scheduled to run every four hours beginning at 04:00. Transaction log backups are scheduled to run every five minutes. What information does the transaction log backup created at 09:15 contain A. All transactions that have been issued since 09:10. B. Transactions that have been committed since 09:10. C. Pages that have changed since 09:10. D. Extents that have changed since 09:10.
Lesson 2: Restoring a Database
Lesson 2: Restoring a Database
The ability to restore a backup determines how quickly your databases can resume responding to business requests after damage occurs. This lesson explains all the options that are now available in SQL Server 2005 to restore all or part of a database. You can use this lesson to form the basis of any disaster recovery planning that is performed within your organization.
After this lesson, you will be able to:
Identify which files are needed from the backup strategy. Restore a database from a single file and from multiple files. Choose an appropriate restore method.
Estimated lesson time: 45 minutes
IMPORTANT
Recovery-oriented planning
Don t be confused by the fact that restoring a database is the second lesson in this chapter. Restoring is the most important concept for you to master. The topic is covered second because you first need to know what types of backups you can create to design a restore strategy. The restore strategy is what makes any backup useful. As the saying goes, If you have never restored a backup, you do not have any backups.
Restoring a Full Backup
Most restore operations begin by re-creating the database at a specific point in time and then applying subsequent backups to bring the database up to a particular point in time. This process begins with a restore of a full backup. As explained previously, a full backup contains the entire contents of a database. To reconstruct a database, the restore operation must place the pages back into the database in sequential order. This process ensures a completely coherent database when finished. It also takes additional time. Restoring a full backup generally requires about 30 percent more time to complete than the backup being restored took to generate.
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