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The principal and mirror roles are transient operating states within a database mirroring session. Because the databases are exact equivalents and are maintained in synchronization with each other, either database can take on the role of principal or mirror at any time.
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The witness server is the third and optional role you can configure within a database mirroring session. You use this server to implement automatic failure detection and failover. You configure the witness server by using the High Availability operating mode, which Lesson 4 discusses. Although database mirroring allows a principal and mirror to occur only in pairs (for example, a principal cannot have more than one mirror, and vice versa), a witness server can service multiple database mirroring pairs. Each
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Implementing Database Mirroring
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database mirroring pair that a witness server services has a single row of information in the sys.database_mirroring_witnesses catalog view. The sole purpose of the witness is to serve as an arbiter within the High Availability operating mode to ensure that the database can be served on only one SQL Server instance at a time. If a primary database fails, and the witness confirms the failure, the mirror database can take the primary role and make its data available to users.
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Database mirroring s principal and mirror roles occur at a database level and must be defined within SQL Server 2005 instances that are either Standard or Enterprise Edition. However, you define the witness role at an instance level. The instance of SQL Server 2005 that you use for the witness server can be any edition, including SQL Server Express Edition, which is why we refer to a principal or mirror database but a witness server.
Quick Check
What are the three database mirroring roles and what functions do they serve The principal database is currently serving the database to applications. The mirror database is in a recovering state and does not allow connections. The optional witness server is an instance of SQL Server that is used for automatic failure detection and failover from a primary to a mirror database.
Quick Check Answer
Lesson Summary
A database participating in a database mirroring session can be in one of two roles: principal or mirror. The principal database is the database that allows connections and transactions to be processed. The mirror database is inaccessible to applications and receives transactions sent from the principal database.
Lesson 1: Understanding Database Mirroring Roles
The witness is a SQL Server instance that functions as an arbiter within a database mirroring session. This is an optional component that you use when you want to implement automatic failure detection and 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 role is valid for database mirroring A. Publisher B. Principal C. Primary D. Monitor 2. Which of the following are valid actions for a witness (Choose all that apply.) A. Arbitrates a failover for the High Protection operating mode B. Arbitrates a failover for the High Availability operating mode C. Serves the database when the principal and mirror are offline D. Services multiple database mirroring sessions
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Implementing Database Mirroring
Lesson 2: Preparing Databases for Database Mirroring
You configure database mirroring on a database-by-database basis. Each database you define must use the Full recovery model to participate in a database mirroring session. And you must initialize each mirror database to ensure that it is synchronized with the principal before you start the mirroring session. This lesson walks through the four general steps you need to take to prepare for database mirroring: 1. Ensure that databases are set to use the Full recovery model. 2. Back up the primary database. 3. Restore the database to the instance hosting the mirror database by using NORECOVERY. 4. Copy all necessary system objects to the instance hosting the mirror database.
After this lesson, you will be able to:
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