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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.
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database mirroring database mirroring role
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17 Review
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database mirroring session database partners endpoint High Availability operating mode High Performance operating mode High Protection operating mode mirror mirror failover operating mode payload principal Transparent Client Redirection witness (witness server)
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Case Scenario: Implementing Database Mirroring
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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 company located in Bothell, WA, has a volatile database containing 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 company, along with external auditors, require access to audit data in the patient claims database at specific points in time. Contoso has had periods during which patient claims data has been unavailable because of administrative actions on the server or equipment failures. The company needs to implement an availability solution that does not require changes to its existing ASP.NET 2.0 and C# .NET 2.0 applications while also providing automatic failover to a secondary server when the primary goes offline. If Contoso can also use the secondary server to offload the audit reviews, that would be a bonus.
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To help you successfully master the exam objectives presented in this chapter, complete the following tasks.
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Establishing Database Mirroring
To become familiar with database mirroring, practice creating endpoints and configuring database mirroring, including configuration of operating modes. Compare states within the mirroring session as you take various components offline and then practice failing over automatically and manually.
Practice 1
Create database mirroring endpoints for a principal, mirror, and witness by using two different methods: the Configure Database Mirroring Security Wizard within the Database Properties, Mirroring page and the CREATE ENDPOINT/ALTER ENDPOINT Transact-SQL commands. Configure database mirroring in High Availability operating mode by using the AdventureWorks database. Take the witness offline and observe the state of the mirror database. Then take the mirror offline and observe the effect on the principal database. Bring the mirror and witness back online and observe the various states within the system. Change the operating mode to High Protection and repeat Practice 3.
Practice 2 Practice 3
Practice 4 Change the operating mode to High Performance and repeat Practice 3. Practice 5 Practice 6
Perform an automatic failover in High Availability operating mode by shutting down the instance hosting the principal while the mirror and witness are online. Initiate a manual failover in each of the operating modes, using two different methods: SSMS and Transact-SQL.
Practice 7
Creating a Database Snapshot Against a Database Mirror
For this task, practice creating a database snapshot that you can use for reporting purposes.
Practice 1
Create a database snapshot against the mirror database. Either drop and re-create the database snapshot or create a series of database snapshots to see how data changes and how quickly it changes on the mirror, depending on the operating mode.
17 Review
Take a Practice Test
The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-431 certification exam content. You can set up the test so that it closely simulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.
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Practice tests
For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.
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