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SQL Server offers three recovery models for databases: Simple, Bulk-Logged, and Full. The Simple recovery model logs all transactions, but removes the inactive portion of the transaction log at each checkpoint. The Bulk-Logged recovery model does not fully log certain operations (for example, the BULK INSERT, BCP, or CREATE INDEX operations). Because Database Mirroring maintains both the primary and mirror
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databases as exact duplicates, including synchronizing all internal structures such as Log Sequence Numbers (LSNs), the Simple and Bulk-Logged recovery models are incompatible with Database Mirroring. Therefore, the only recovery model that a database can use to participate in Database Mirroring is the Full recovery model.
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Full recovery model required
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You cannot configure Database Mirroring if the participating databases are not in Full recovery model. And you cannot change the recovery model of a database participating in Database Mirroring.
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Because the principal and mirror databases are duplicates of each other, a mechanism is needed to ensure that both databases are initialized to the same state. The process of initialization for Database Mirroring involves performing a backup of the principal database and restoring it to the mirror. A backup is also the only mechanism that you can use to initialize the mirror database because all internal structures, such as the LSNs, as well as the data need to be synchronized. When restoring the database to the mirror, it is essential that you specify the NORECOV ERY option for the RESTORE command, which guarantees that the starting state of the mirror reflects the state of the principal database, including the LSNs. You will find that the backup and restore process consumes the most amount of time during Database Mirroring configuration. However, you probably cannot take the pri mary database offline to initialize Database Mirroring. Instead, because the database on the mirror is in an unrecovered state, you can apply a chain of transaction logs to bring the mirror up to date.
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NOTE
Initializing the mirror
Instead of performing a backup to initialize the mirror, we always use the last full backup of the pri mary database and then apply all subsequent transaction logs. After all log backups are taken, we execute a final transaction log backup to capture all remaining transactions and then initiate Data base Mirroring. An alternative method uses log shipping to maintain the two databases in synchro nization and as the initialization mechanism for Database Mirroring. In this case, you might still have to apply at least one transaction log backup before you can initiate the Database Mirroring session. For more information about backup/restore and log shipping, please see 13, Designing a Data Recovery Strategy, and 10, Log Shipping, respectively.
Lesson 2: Initializing Database Mirroring
Copy System Objects
Database Mirroring operates at a database level, so it is not responsible for any other objects on the server. So although you can configure Database Mirroring to automat ically fail over to the mirror database, to allow applications to function after a failover you must ensure that all other objects are transferred to the instance hosting the mir ror database. The most common objects that you must transfer are the logins that allow applica tions to authenticate for database access. You can also have linked servers, SQL Server Integration Services (SSIS) packages, SQL Server Agent jobs, custom error messages, or other objects configured on the server that hosts the primary database. Copying all these objects to the instance hosting the mirror database is the final step in the initial ization process.
NOTE
Using SSIS tasks to transfer objects
To transfer objects to the instance hosting the mirror database, you can use SSIS, which includes the Transfer Logins task for transferring logins from one instance of SQL Server to another while keeping any passwords encrypted. SSIS also provides tasks for transferring SQL Server Agent jobs, error messages, and other types of objects.
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