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Configuring the Operating Mode
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In this exercise, you will practice configuring the AdventureWorks database for High Availability operating mode. 1. Right-click the AdventureWorks database on the instance that will host the principal database, choose Properties, and select the Mirroring page.
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Implementing Database Mirroring
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2. Specify the endpoints for principal, mirror, and witness that you configured in the previous establishing endpoints practice.
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Retrieving an endpoint address
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If you do not remember the endpoint addresses, you can retrieve them using one of two mechanisms:
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You can query sys.database_mirroring_endpoints on each instance to get the endpoint address for each instance. You can launch the Configure Database Mirroring Security Wizard by clicking Configure Security and walking through each step. Because you have already created the endpoints, the wizard automatically retrieves information about them. When the wizard finalizes, it automatically enters the endpoint addresses into the appropriate fields for configuring database mirroring.
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3. Verify that the Synchronous With Automatic Failover (High Availability) operating mode is selected. 4. Click Start Mirroring. When mirroring completes, click OK to close the Database Properties AdventureWorks dialog box.
NOTE
Transact-SQL alternatives for configuring operating mode
This process within SSMS is equivalent to connecting to the mirror database and issuing an ALTER DATABASE SET PARTNER Transact-SQL statement and then connecting to the principal database and issuing the statement ALTER DATABASE SET PARTNER along with ALTER DATABASE SET WITNESS.
Lesson Summary
Operating modes govern the way SQL Server transfers transactions between the principal and the mirror databases as well as the failover processes that are available in the database mirroring session. High Availability operating mode synchronously transfers data between principal and mirror, requires a witness, and automatically fails over only when the witness is present. High Performance operating mode asynchronously transfers data between principal and mirror, does not use a witness, and requires a manual failover. High Protection operating mode synchronously transfers data between principal and mirror, does not use a mirror, and requires manual failover.
Lesson 4: Understanding Operating Modes
Metadata transactions are periodically sent to the mirror to maintain the cache on the mirror in a semi-hot state. Transparent Client Redirection allows connections to be transparently redirected to the mirror upon a failover.
Lesson Review
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.
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. Which of the following are characteristics of High Availability 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 Performance operating mode (Choose all that apply.) A. Asynchronous data transfer B. Synchronous data transfer C. Automatic failover D. Manual failover 3. 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
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Implementing Database Mirroring
Lesson 5: Failing Over a Database Mirror
When you configure a database mirroring session in High Availability operating mode, a failure of the principal triggers an automatic failover to the mirror in all except one scenario: when the witness server is unavailable. You must always perform manual failover for the High Performance and High Protection operating modes. For these reasons, it is important for you to understand how to manually fail over to the mirror to achieve maximum uptime. This lesson explains the failure scenarios requiring a manual failover as well as the commands you use to initiate a failover.
After this lesson, you will be able to:
Explain which failure scenarios require manual failover. Fail over a database mirroring session.
Estimated lesson time: 10 minutes
Understanding Failure Scenarios
As Lesson 4 explained, a database mirroring session in High Availability operating mode can automatically fail over to the mirror as long as the witness is online and available. Automatic failover requires the presence of the witness to prevent both the principal and the mirror from bringing the database online. However, if the witness is offline and the principal fails, you must manually fail over the database mirroring session at the mirror.
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