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Lesson Summary
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SQL Server 2005 provides a flexible and granular way to restore damaged data. To recover an entire database, you can perform a full restore along with restoring differential and transaction logs. You can use the STOPAT option to restore a database to a particular LSN, named transaction, or point in time. You can restore individual filegroups, and as long as the primary filegroup is not restored, the rest of the database can remain online and operational. You can restore individual pages to fix corruption issues. Restore operations can continue past bad sectors within backup media to make a best effort to recover as much data as possible.
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11
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Backing Up, Restoring, and Moving a Database
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Lesson Review
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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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Answers
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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.
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1. Your database has become damaged. Which of the following can be used to determine which backups can be used to restore the database (Choose all that apply.) A. SQL Server error log B. msdb.dbo.sysbackuphistory table C. msdb.dbo.backupset table D. Windows Application Event Log 2. The patient claims database at Contoso Limited contains a very sophisticated structure. The database contains six filegroups: PRIMARY, FG1, FG2, FG3, FG4, and FG5. FG4 and FG5 contain the claims table, which is partitioned. Active claims are in FG4, and inactive claims are in FG5. Full database backups are performed once per week on Sunday, with differential backups occurring every 12 hours and transaction log backups running every five minutes. Because of the highly volatile nature of the active claims data, FG4 has a filegroup backup run against it once per day, with filegroup differential backups every hour. Claims are only moved from an active to an inactive state during a maintenance routine that occurs at midnight on Saturday. On Thursday afternoon, a portion of the claims table containing the inactive claims becomes damaged and needs to be restored. Which backups will accomplish this (Choose all that apply.) A. Filegroup backup B. Full backup C. Transaction log backups D. Filegroup differential backup
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Lesson 3: Moving a Database
Lesson 3: Moving a Database
Occasionally, databases need to be moved either within the same server or between servers. SQL Server provides three mechanisms that you can use to move databases. The first method, backup and restore, has already been discussed in the previous two lessons. This lesson will cover the other two methods: using detach/attach and the Copy Database Wizard, which enables you to use detach/attach or SQL Management Objects (SMO).
After this lesson, you will be able to:
Choose an appropriate method for moving a database.
Estimated lesson time: 20 minutes
Moving a Database by Using Detach/Attach
You can unmount databases from a SQL Server by detaching them. This process removes the entries in the system tables for this database, causing it to no longer be accessible on the SQL Server instance. Although the database is inaccessible, the files that contain all the objects and data still exist on the operating system in the location in which you created them. After they are detached, you can copy these files to any location on your network because they are no longer being accessed by SQL Server. To make the database accessible again, you only have to attach it. This process adds an entry in the system tables for the database. And SQL Server then enables access to the database.
NOTE
Detach/attach performance
The detach operation requires SQL Server only to close the files and remove an entry in the system tables. And an attach requires SQL Server to simply open the files and make an entry in the system tables. Each operation requires only 1 2 seconds at most to complete.
The following example shows the command required to perform a detach operation:
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