c# print 2d barcode Exercise 7: Restoring the Transaction Log Backups in C#

Create Universal Product Code version A in C# Exercise 7: Restoring the Transaction Log Backups

Exercise 7: Restoring the Transaction Log Backups
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In this exercise, you restore the transaction log backups that you performed in Exer cise 3. 1. In SSMS, replace any text in the query pane with the following code:
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USE Master
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RESTORE LOG MyDB
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FROM DISK = 'C:\Backup\MyDB_log1.trn' WITH NORECOVERY
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RESTORE LOG MyDB
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FROM DISK = 'C:\Backup\MyDB_log2.trn'
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WITH NORECOVERY
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Lesson 3: Recovering a Database
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2. Click Execute. This code applies the first and second transaction logs to the database. 3. Leave the query pane open.
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Exercise 8: Restoring the Tail-Log Backup
In this exercise, you restore the tail-log backup that you performed in Exercise 4. You also recover the database to make it consistent and bring it online. Finally, you display the contents of the database to verify that no data has been lost. 1. In SSMS, replace any text in the query pane with the following code:
USE Master
RESTORE LOG MyDB
FROM DISK = 'C:\Backup\MyDB_tail.trn'
WITH RECOVERY
2. Click Execute. 3. In the console tree of SMSS, right-click the Databases folder and then choose Refresh from the shortcut menu.
The MyDB database is no longer shown to be in a Restoring state.
4. Replace any text in the query pane with the following code:
USE MyDB
SELECT * FROM dbo.World
5. Click Execute. The output reveals that all five rows of data have been restored.
Lesson Summary
In the Simple recovery model, you cannot perform transaction log backups. To restore a database set to the Simple recovery model at the time of the last backup, first restore the last full backup and then restore the last differential backup (if any) performed since the last full backup. This recovery model is suit able for databases whose data rarely changes. In the Full recovery model, you can perform transaction log backups. To restore a database set to the Full recovery model at the time of the last backup, first back up the tail of the log, if possible. Next, restore the last full backup and then restore the last differential backup (if any) performed since the last full backup.
13
Designing a Data Recovery Strategy
Finally, apply all the transaction log backups performed, in order, since the last full or differential backup. The Full recovery model enables data recovery to the point of failure and to a point in time.
The Bulk-Logged recovery model is used to improve efficiency during bulklogged operations. The Bulk-Logged recovery model resembles the Full recovery model in that it enables data to be recovered to the point of failure (but only if failure does not occur during a bulk operation). Unlike the Full recovery model, the Bulk-Logged recovery model does not enable recovery to a point in time. A disaster recovery plan is a written document that helps you prepare for and handle outages. A recovery plan can include people to contact in case of an out age, a decision tree and checklist of required tasks in a recovery scenario, and a set of recovery success criteria.
Lesson Review
You can use the following questions to test your knowledge of the information in Les son 3, Recovering a Database. The questions are also available on the companion CD if you prefer to review them in electronic form.
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. You need to ensure point-in-time recovery for a database named Accounting. To which recovery model should you set the Accounting database A. Simple B. Bulk-Logged C. Full D. None 2. The business requirements of a new database determine that it should be set to the Simple recovery model. You now need to create a written recovery plan for this database. Which instructions should you include as part of the document A. Back up the active portion of the log. Apply all the transaction logs backups in sequence since the last full or differential backup. Then restore the last differential backup, if any. Finally, restore the last full backup.
Lesson 3: Recovering a Database
B. Back up the active portion of the log. Restore the last full backup. Then restore the last differential backup, if any. Finally, apply all the transaction logs backups in sequence since the last full or differential backup. C. Determine whether any differential backups have been performed since the last full backup. Restore the last full backup and then restore this last differential backup, if any. D. Determine whether any differential backups have been performed since the last full backup. Restore this last differential backup, if any, and then restore the last full backup. 3. Which of the following is the first step in a disaster recovery procedure for a data base set to the Full recovery model at the time of the last backup A. Attempt to back up the log with the NO_TRUNCATE option. B. Apply in sequence all of the transaction log backups since the last full or differential backup. C. Attempt to restore the last full backup with the RECOVERY option. D. Attempt to restore the last full backup with the NORECOVERY option. 4. Which of the following represents a possible data recovery scenario for a data base set to the Bulk-Logged recovery model at the time of the last backup A. A new table is accidentally deleted. The data is then restored to the point just before the table deletion. B. The database and log are accidentally deleted. The data is then restored to the point just before the deletion. C. The database fails. The data is then restored to the point of failure. D. The database fails during a bulk-copy operation. The data is then restored to the point of failure. 5. You need to create a recovery plan for a server that is currently in production. What do you do (Choose all that apply.) A. Test the restore strategy by restoring the backups to a test server. B. While you are performing the restore procedure, document the steps required to recover the database. C. Take the production server offline and perform the restore. D. Compile a list of people to contact in case of a data loss incident.
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