generate barcode in vb.net Lesson 3: Designing Failover and Failback Strategies in Visual C#

Drawer UPCA in Visual C# Lesson 3: Designing Failover and Failback Strategies

Lesson 3: Designing Failover and Failback Strategies
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Practice: Failover a Database Mirroring Session
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In this exercise, you will failover the mirroring session that was implemented in the previous exercise. 1. Open a new query window, connect to INSTP, and execute the following code:
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ALTER DATABASE AdventureWorks SET PARTNER FAILOVER;
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2. Observe that the AdventureWorks database on INSTM is now in the role of the principal.
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Forcing a failover
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The SET PARTNER FAILOVER option is available only if the mirroring session is synchronized, is oper ating in High Availability mode, and is executed from the principal. To force a failover for either the High Performance or High Protection operating modes or when the principal is unavailable, you need to execute the ALTER DATABASE AdventureWorks SET PARTNER FORCE_SERVICE_ALLOW_DATA_LOSS; command.
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Database Mirroring can take care of the failover from the principal to the mirror, automatically promotes the mirror and demotes the failed partner, and can even perform an automatic incremental resynchronization in some cases. However, this capability is wasted unless you are ensuring that logins, linked servers, and other supporting objects are present on the mirror at the time of failover. A failback should be done only if dictated by company policy or if performance is degraded following a failover.
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Lesson Review
You can use the following questions to test your knowledge of information in Lesson 3, Designing Failover and Failback Strategies. 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.
9
Database Mirroring
1. Which of the following are characteristics of High Performance operating mode (Choose all that apply.) A. Asynchronous data transfer B. Synchronous data transfer C. Automatic failover D. Manual failover 2. Which of the following are characteristics of High Protection operating mode (Choose all that apply.) A. Asynchronous data transfer B. Synchronous data transfer C. Automatic failover D. Manual failover
9 Review
Review
To further practice and reinforce the skills you learned in this chapter, you can per form the following tasks:
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 involv ing the topics of this chapter and asks you to create solutions. Complete the suggested practices. Take a practice test.
Summary
High Availability operating mode ensures that transactions are redundant across servers while also having the capability to automatically fail over. High Protection operating mode ensures that transactions are redundant across servers, but requires a manual failover. High Performance operating mode does not guarantee redundancy in transac tions and also requires manual failover.
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.
Database Mirroring Database Mirroring role Database Mirroring session database partners endpoint High Availability operating mode High Performance operating mode High Protection operating mode mirror
9 Review
mirror failover
operating mode
principal Transparent Client Redirect witness (witness server)
Case Scenario: Database Mirroring
In the following case scenario, you apply what you ve learned about database mirror ing. You can find answers to these questions in the Answers section at the end of this book.
Background
Company Overview
Margie s Travel provides travel services from a single office located in San Diego. Cus tomers can meet with an agent in the San Diego office or can make arrangements through the company s Web site.
Problem Statements
With the addition of a new product catalog, the Web site is experiencing stability issues. Customers are also prevented from purchasing products or services at various times during the day when changes are being made to the underlying data. The company has just fired the consulting firm responsible for developing and man aging the Web site and all other applications within the company because of a failure to provide any availability for business-critical systems.
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