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As pointed out in the log shipping tuning section above, minimize your data loss exposure by frequently backing up the transaction log. You will not save disk space by making fewer and larger backups. The only exposure you have is massive data loss if that one large file is corrupted or the log device is lost prior to backing it up. Shipping the log at
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many small points in time provides less chance for data loss by moving the data over to the log shipping server in more frequent intervals. Experiment on your hardware. Take tests and measurements. Figure out what your company s data loss exposure is. Talk with the managers to understand the service level agreement between IT and the business units. Reflect these realities in the scheduling of the transaction log backups and the overall database recovery strategy.
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Log shipping and mirroring are just technologies that help facilitate high availability. In and of themselves, they are not a substitute for a strategy. High availability is a goal, and how you get there is the strategy. Log shipping and mirroring fit in well and compliment each other in the array of choices a company has for deploying a high availability solution. They fit in well with clustering, replication at the SAN level (dark fiber), a robust backup solution, and so on. Take full advantage of them. They are a terrific out-of-the-box solution that will save you time and the company a lot of money, both in development hours and reduction in lost data.
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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.
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Part VI
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High Availability
Configuring Database Mirroring
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.
Planning and Considerations for Database Mirroring
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
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