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Preparing Databases for Database Mirroring
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In this exercise, you will practice preparing databases for database mirroring using the AdventureWorks database. 1. Connect to the instance hosting the AdventureWorks database that you want to use as the principal database. 2. Right-click the AdventureWorks database and choose Properties. Select the Options page. 3. From the Recovery Model drop-down list, select Full. Click OK. 4. Back up the AdventureWorks database. 5. Copy the backup to the machine running the instance on which you want to host the mirror database. 6. Restore the AdventureWorks database, ensuring that you specify not to recover the database.
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Lesson 2: Preparing Databases for Database Mirroring
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7. Back up the transaction log on the AdventureWorks database, copy the backup to the machine running the instance in which the mirror database is being hosted, and restore the transaction log. 8. Transfer to the instance hosting the mirror all logins, jobs, linked servers, and other objects external to the database that are needed for the application to work.
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Database mirroring maintains synchronization between the two databases in the mirroring session. All databases that participate in database mirroring must be set to the Full recovery model to ensure that all transactions are applied to the mirror. You then must initialize the mirror by restoring a backup, ensuring that the NORECOVERY option is specified. Because database mirroring is responsible only for copying the contents of a database to the server hosting the mirror database, you must separately copy over all other server objects, such as logins, linked servers, and jobs.
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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.
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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 is a valid step for preparing a database to participate in a database mirroring session (Choose all that apply.) A. Configure distribution. B. Back up the database. C. Restore the database with RECOVERY. D. Restore the database with NORECOVERY.
17
Implementing Database Mirroring
2. Which database setting is valid for database mirroring A. Full recovery model B. 80 compatibility level C. Read only D. Bulk-Logged recovery model
Lesson 3: Establishing Endpoints
Lesson 3: Establishing Endpoints
SQL Server 2005 introduces a stronger, revamped, multilayer security model. The first layer of security occurs at the connection point to an instance. And endpoints control the capability to connect to an instance. Because database mirroring relies on connectivity among up to three instances of SQL Server 2005, you must establish endpoints to enable communications among these instances. In this lesson, you review the concept of endpoints, walk through endpoint options, and see how to configure endpoints specifically for database mirroring.
After this lesson, you will be able to:
Explain endpoint configuration options and best practices. Create endpoints for database mirroring.
Estimated lesson time: 10 minutes
Endpoint Types
In SQL Server 2005, you can create two types of endpoints: TCP or HTTP. Database mirroring uses TCP endpoints for communications. HTTP endpoints, on the other hand, service SOAP requests.
MORE INFO
HTTP endpoints
For information about HTTP endpoints, see 13, Working with HTTP Endpoints.
Along with a type definition for an endpoint, you specify a payload. TCP endpoints can have a payload of TSQL, SERVICE_BROKER, or DATABASE_MIRRORING. For a database mirroring session, you create TCP endpoints with a payload of DATABASE_MIRRORING. You create an endpoint at the SQL Server instance level instead of at the database level. So for each SQL Server instance, you can create only one endpoint, which has a payload of DATABASE_MIRRORING.
MORE INFO
Endpoints
For more information about endpoints, see the SQL Server 2005 Books Online article CREATE ENDPOINT (Transact-SQL). SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/ technet/prodtechnol/sql/2005/downloads/books.mspx.
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