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Database mirroring is a new high availability technology that was introduced in SQL Server 2005. Primarily, it is used as part of an overall high availability solution, but it can also be used as a database reporting solution. It can be used in a variety of ways: stand alone or in conjunction with log shipping, clustering, or database snapshots. Mirroring provides a hybrid solution: a copy of database like with log shipping, rapid failover capabilities like with clustering, and elimination of the issues associated with shared disk solutions. Mirroring in a minimal configuration consists of two database servers: the principal and the mirror. The principal database is the primary database that is online and accessible to users. The mirror database is a copy of the principal that is in a restoring state and has the changes applied to it from the principal database as they occur. The failover method for this configuration is manual. A more robust configuration consists of three database servers: principal, mirror, and the witness. The witness server is an active observer of the principal/mirror combination. If the principal goes down, the witness automatically fails over to the mirror and brings it online. These configurations are explained in this chapter, in addition to practical uses of each and how they fit into an overall high availability solution.

Like log shipping, database mirroring starts with a backup copy of the primary database, but unlike log shipping, the writes to the transaction log are transmitted to the standby system immediately, not when a log backup occurs. This allows the mirror system to remain in sync with the primary system. Because of this, it is much more flexible in terms of the protection it provides; however, the performance considerations of the network are more restrictive.

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Since our application doesn t restrict what buttons the user can click, we need to provide error handling. In general, error handling is a good idea, but when dealing with threads it is very important. At the very least, it s a good idea to wrap all calls to methods that can change the state of a thread with try catch blocks. A more robust form of error handling would be to check the state the thread is in before attempting to change it. Spending time developing robust error handling can greatly reduce the time associated with maintenance and debugging a multithreaded application. This concept is true of developing any application, but because of the potentially high complexity of developing multithreaded applications it is imperative to provide good error logging, if not error handling. 5.5.2 The Resume method In the previous section we covered the Suspend method. We saw how it allows us to interrupt the execution of a thread and place it in a Suspended state. To exit the Suspended state, we use the Resume method. Regardless of how many times Suspend was called, a single call to Resume allows the thread to exit the Suspended state.

Designing a highly available system requires understanding of the technologies to be deployed, how they work together, and the advantages and disadvantages of each. Mirroring is no different. The solution offers compelling benefits and several options in the configuration of the solution that must be decided upon before implementation. The main considerations to take into account when designing database mirroring are the performance characteristics of the mirror and recovery method. By considering these options prior to configuring database mirroring, you will end up with a more successful design. Note

To run database mirroring, the recovery model has to be set to FULL. For example, ALTER DATABASE prod SET RECOVERY FULL or via the database properties screen in the SQL Server Management studio.

The database mirroring solution is a high availability and disaster recovery solution that serves a specific purpose. It is not a substitute for database backups. Note

In addition to deploying an entire solution, you have the option to deploy a single report or multiple reports within a project or solution. A report is published by using one of these deployment options to transfer it from Visual Studio to the Report Server. There are other ways to publish a report that you will learn about in 8.

Database mirroring consists of several main components. They are the principal database, mirror database, the witness, and the endpoints. The various combinations of these help define how the operating modes of mirroring work in a highly available environment. First, let s start off by defining the basic components:

Resume is a method on the Thread object that allows a thread to continue execution after it has been suspended by calling the Suspend method.

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