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Replicating Data with Standby Servers
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Standby servers function by keeping data synchronized between multiple SQL Server installations. One SQL Server is used for production purposes. This is the server to which clients normally connect. Another machine the standby server contains a replica of all information stored on the production server. Whenever a change is made to a database residing on the production server, it is also made in the databases stored on the standby server. The main goal is to ensure that the databases stay synchronized. If the production server fails, clients can be automatically redirected to use the standby server. Although the process is manual, the impacts of downtime are minimized.
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Standby servers are set up through the use of normal and transaction log backups. If you re unfamiliar with the standard backup and recovery commands, I recommend you review the information presented in 6, Performing Database Backups, and 7, Recovering the Data. In this section, we ll look at how backup and recovery commands can be used in the implementation of a standby server.
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The first task is to set up a standby server. To do this, you ll need to create a second installation of SQL Server 7 on a separate server. In the following steps, I ll refer to one installation as the production server and the other as the standby server. To set up the standby server with an initial copy of the necessary databases on the production server, first back up the databases on the production server. Then, restore these databases to the standby server, but use the STANDBY clause to specify that the database should be placed in standby mode. This will create a baseline copy of the database on the standby server and create an undo log file. The undo log file contains a copy of the data pages that were modified by any uncommitted transactions in the transaction log. After you make a copy of the production database(s) on the standby server, you re ready to start synchronizing information by using transaction logs. This technique is known as log-shipping and involves the creation of a database transaction log dump, which includes a list of all the transactions that have been committed on the production server. The dump file must be made accessible to the standby server (either by using an automated copying process or by creating network shares). The database information is
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In some ways, replication can be used to keep data consistent between servers. For example, transactional replication will ensure that all the information on remote servers stays consistent with that on the current server. However, this solution requires a lot of server resources, and can significantly decrease performance on busy production machines. A reasonable level of data consistency might be expected from frequent backup and restoration operations, but, again, the disk I/O and CPU resources might make this prohibitive. A standby server works by constantly backing up transaction log information and then automatically restoring that data to a second server. In addition to conserving resources, this process automates the synchronization, thus ensuring that information on the standby machine is synchronized with data on the primary server. We already mentioned that when a production server fails and a standby server is brought online, clients must manually reconnect to the new production server. When planning for and implementing standby servers, be sure that application developers, managers, and end users are aware of the processes. The afternoon following a critical server failure is not a convenient time to educate users on creating and managing ODBC connections! Now that we have a good understanding of the goals and functions of standby servers, let s move on to look at how this can be implemented.
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