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Security is the most important aspect that you configure for Database Mirroring. You can configure the Database Mirroring endpoint for either encrypted or nonencrypted communications. It is recommended that you leave the endpoint configured by the default value, which encrypts all traffic between endpoints. If the instances partici pating in Database Mirroring do not have the same service account for the SQL Server service, you must ensure that each service account is granted access to the SQL Server along with being granted CONNECT TO authority on the Database Mir roring endpoint.
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For more information about defining the security of a Database Mirroring endpoint, please refer to 5.
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You can configure Database Mirroring for three different operating modes: High Avail ability, High Performance, and High Protection. The operating mode governs 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. In this lesson, you learn about each operating mode, the benefits of each mode, and how caching and transparent client redirect capabilities give Database Mirroring advan tages over other availability technologies.
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High Availability operating mode provides durable synchronous transfer between the principal and mirror databases, as well as automatic failure detection and automatic failover. SQL Server first writes all transactions into memory buffers within the SQL Server memory space. The system writes out these memory buffers to the transaction log. When SQL Server writes the transaction to the transaction log, the system triggers Database Mirroring to begin transferring the transaction log rows for a given transac tion to the mirror. When the application issues a commit for the transaction, the trans action is first committed on the mirror database. An acknowledgment of the commit is sent back to the principal, which then enables the commit to be issued on the prin cipal. After the commit is issued on the principal, the acknowledgment is sent back to the application, enabling it to continue processing. This process guarantees that all transactions are committed and hardened to the transaction log on both the principal
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Lesson 1: Overview of Database Mirroring
and mirror databases before the commit is returned to the application. The way Database Mirroring handles transactions separates it from other redundancy technologies such as log shipping and replication, which must wait for a transaction to complete before it can be transferred to the other machine. Database Mirroring transmits log records as they are written to the principal. By processing in this man ner, Database Mirroring can handle transactions affecting very large numbers of rows with very little impact on applications. In fact, as the average size of transactions increases, the impact of the synchronous data transfer for Database Mirroring decreases. The decrease in impact happens because the acknowledgment required for the High Availability operating mode requires a smaller percentage of the overall exe cution time of the transaction as the size of the transaction increases. The synchronous transfer of data poses a planning issue for applications. Because a transaction is not considered committed until SQL Server has successfully committed it to the transaction log on both the principal and the mirror databases, High Avail ability operating mode incurs a performance overhead for applications. As the dis tance between the principal and the mirror instances increases, the performance impact also increases. High Availability operating mode requires a witness server along with the principal and mirror databases for Database Mirroring to automatically detect a failure at the principal and fail over to the mirror. To detect failure, High Availability operating mode uses a simple ping between each instance participating in the Database Mirror ing session.
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