Lesson Review in VS .NET

Painting PDF417 in VS .NET Lesson Review

Lesson Review
Creating PDF 417 In VS .NET
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Recognize PDF417 In VS .NET
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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
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Answers
Make PDF417 In VB.NET
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Linear Generator In VS .NET
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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.
Painting Barcode In .NET
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1. Which operations can be performed against a Database Snapshot A. BACKUP DATABASE B. ALTER DATABASE C. SELECT COLUMN1, COLUMN2 FROM TABLE D. UPDATE TABLE1 SET COLUMN1 = 4 2. You can create a Database Snapshot against which types of databases (Choose all that apply.) A. User database B. Master database C. Another Database Snapshot D. Mirror database
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16
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Managing Database Snapshots
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3. What data is contained within a Database Snapshot (Choose all that apply.) A. All original pages of the source database B. Only the original image of pages changed since the Database Snapshot was created C. A catalog of changed pages D. Metadata about the database objects
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Lesson 2: Reverting a Database from a Database Snapshot
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Lesson 2: Reverting a Database from a Database Snapshot
A Database Snapshot provides a point-in-time copy of a source database. Because it provides a copy of the data in the database, you can use it to recover in a variety of situations. In the event of data being accidentally damaged or if an administrative process makes changes that are unwanted, you can extract the original version of the data from the Database Snapshot and move it back into the source database using either an INSERT or UPDATE statement. In an extreme case, a DBA might want to restore the state of a database back to a previous point in time. This lesson will explain how to revert a source database to a previous point in time by using a Database Snapshot.
After this lesson, you will be able to:
Revert a database from a Database Snapshot.
Estimated lesson time: 10 minutes
Reverting a Database
Reverting a database is a special subclass of restore operation that you can perform against a database. During a restore of a database, you can leave the database in a recovering state to apply subsequent transaction logs to roll a database forward to a specific point in time. Reverting a database will take a database back to a point in time; however, you cannot restore subsequent backups after reverting the database to that point in time. Using a Database Snapshot to revert a database has some restrictions:
Only a single Database Snapshot can exist against a source database. Any full-text catalogs on the source database are dropped and must be re-created. The transaction log is rebuilt, which breaks the log chain. The source database and Database Snapshot are offline during the revert.
The syntax to revert a database from a Database Snapshot is as follows:
RESTORE DATABASE <database_name> FROM DATABASE_SNAPSHOT = <database_snapshot_name>
16
Managing Database Snapshots
Quick Check
How many Database Snapshots can exist against a source database when you are restoring Reverting a database using a Database Snapshot causes all the changed pages within a Database Snapshot to overwrite the corresponding pages in the source database. Because this process changes the state of the database, it would immediately invalidate all Database Snapshots except the one used to revert from. Therefore, SQL Server enforces the restriction that only a single Database Snapshot can exist against a source database when you use the Database Snapshot to revert. In this way, it prevents the possibility of having invalid Database Snapshots.
Quick Check Answer
PRACTICE
Reverting a Database from a Database Snapshot
In this practice, you will revert the AdventureWorks database to a previous version using the Database Snapshot you created in the previous lesson in this chapter. 1. If necessary, open SSMS and connect to the SQL Server instance containing the Database Snapshot you created in the previous lesson in this chapter. 2. Click New Query. 3. Type the following code:
RESTORE DATABASE AdventureWorks FROM DATABASE_SNAPSHOT = snapshottest
4. Verify that the data added to the table in the AdventureWorks database during the previous exercise no longer exists.
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