Lesson Summary in .NET

Creation PDF 417 in .NET Lesson Summary

Lesson Summary
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The RESTORE DATABASE command contains a special clause that enables a DBA to revert a database from a Database Snapshot. This operation would invalidate any other Database Snapshots created against the source database, so you must drop all other Database Snapshots before you can perform a revert. Additionally, any operation that relies on a contiguous transaction log chain will be interrupted because the restore process will rebuild the transaction log.
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Lesson 2: Reverting a Database from a Database Snapshot
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Lesson Review
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The following question is intended to reinforce key information presented in this lesson. The question is also available on the companion CD if you prefer to review it in electronic form.
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NOTE
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Answers
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Answers to this question 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. Which of the following are required before a database can be reverted from a Database Snapshot (Choose all that apply.) A. Full text catalogs on the source database must be dropped. B. Users cannot be accessing the source database or the Database Snapshot. C. Log shipping must be stopped. D. All Database Snapshots except the Database Snapshot used for the revert must be dropped.
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16 Review
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Review
To further practice and reinforce the skills you learned in this chapter, you can
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenario. This scenario sets up a real-world situation involving the topics of this chapter and asks you to create solutions. Complete the suggested practices. Take a practice test.
Summary
A Database Snapshot is a point-in-time, read-only copy of a source database that can be used for read activities. In addition to read activities, you can use a Database Snapshot to revert a database to a previous point in time defined by the instant in time at which you created the Database Snapshot. Because Database Snapshots can be used for read operations as well as recovering to a previous point in time, they are ideal for use in situations in which DBAs would normally create an interim backup to eliminate a significant amount of time spent during maintenance operations.
Key Terms
Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.
catalog of changed pages copy-on-write Database Snapshot reverting a database source database sparse file
16 Review
Case Scenario: Implementing Database Snapshots for Administrative Actions
In the following case scenario, you will apply what you ve learned in this chapter. You can find answers to these questions in the Answers section at the end of this book. Contoso Limited, a health care organization located in Bothell, WA, has a very volatile database that contains patient claims data. The patient data is protected by privacy laws, and all access to this data is required to be audited. Audit data is written into a set of audit tables by the stored procedures that control all data access within the patient claims database. Auditors within the organization, along with external auditors, require access to audit data in the patient claims database at specific points in time. Each evening, Contoso receives data feeds from several external vendors who process payments to patients. Data in the feeds frequently needs to be edited and reimported based on validation scripts that reconcile the data within the patient claims database with the data feeds submitted by the external vendors. During the time when the import processes execute, no other transactions are issued against the patient claims database. The current process creates a full backup of the patient claims database before the import routines are executed. 1. How can Contoso DBAs reduce the amount of time it takes to import data feeds 2. What mechanism can Contoso use to provide mutiple point-in-time copies of the data for auditors to query while minimizing the amount of time spent on administering this solution
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