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SQL Server 7 Backup & Recovery
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then restored at the standby server, using the Standby clause, and ensures data consistency on the standby server. If you need to bring the standby server online (due to the failure of the production server), the process is as follows: 1. If possible, back up the current transaction log on the production server. If this is not possible (for example, due to a disk failure), then you will not be able to recover data up to the point of failure. 2. If available, restore from all transaction log backups that have not yet been committed. This includes the transaction log backup that you made in step 1 (if it is available). 3. Execute the RESTORE command and the WITH RECOVERY option to bring the standby server online. This will ensure that the database is valid and will allow users to connect to it as they did to the old server. Keep in mind that clients may need to reconfigure their settings, because they will now be connecting to a different machine with a different network name and address. You can set up a standby server by using the wizards and graphical tools included with SQL Server 7. For details on these steps, see the information in s 6 and 7. The key to performing log-shipping properly is to automate the processes and schedule them. To do this, Transact-SQL commands are quite convenient. Let s look at some examples next.
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Using Transact-SQL Commands
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Transact-SQL commands provide a great way to script your backup and recovery processes. They re especially useful for standby servers, because you can place all of these commands in script files or stored procedures and execute them at specific times by using the SQL Agent. The following Transact-SQL commands will provide a sample of the steps required to implement a standby server for the Customers database. 1. To create a backup of the Customers database, execute the following command on the production server:
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BACKUP DATABASE Customers TO BackupDevice1
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2. Then, copy the database dump to the standby server. To restore this database on the standby server, use the following command:
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RESTORE DATABASE Customers FROM BackupDevice1 WITH STANDBY = 'C:\MSSQL7\Backup\undo.ldf'
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3. Now that you have set up the initial copy of the Customers database on the standby server, you ll need to create a transaction log dump on the production server. Do this with the following command:
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BACKUP LOG Customers TO BackupDevice2
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Advanced Data Protection Tactics
4. Finally, restore this log file to the standby server:
RESTORE LOG Customers FROM BackupDevice2 WITH STANDBY = 'C:\MSSQL7\Backup\undo.ldf'
Backing up and restoring the log file is a process that should be performed at regular intervals. How often this process is performed will be based on your business requirements. On busy servers, you might want to perform the operations every few minutes. On less active servers, it might be acceptable to perform the log-shipping every few hours. In the event of a database failure, you should try to back up the active transaction log from the production server by using the WITH NO_TRUNCATE option, as in this example:
BACKUP LOG Customers WITH NO_TRUNCATE
If this is not possible, you will still be able to recover, but you will not have the latest information in the database. Next, use the RESTORE LOG command with the STANDBY option to recover any transaction logs that have not yet been restored. After the last transaction log restoration operation, you ll want to use the RECOVERY option, as shown here:
RESTORE DATABASE Customers WITH RECOVERY
This will place the database back online and ready for use. Overall, the implementation of standby servers can greatly reduce the amount of time required to reinstate a usable server. Although application and client reconfiguration might be required, recovering the necessary data will take only a small fraction of the time. For many organizations, this level of protection is all that is required. For others, however, server failures must be imperceptible to users. We ll cover an appropriate solution for this sort of situation in the following section.
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