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wizard will provide new users with a good idea of the types of operations that are possible in SQL Server 7. Next, we ll move on to more detailed methods for situations in which you require additional control of your backups. Finally, we ll look at some other ways of transferring data into and out of your SQL Server installation.
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As we saw earlier in this section, the Database Maintenance Plan Wizard is a good solution for covering most of your backup requirements. It can handle issues related to backing up databases, performing consistency checks, and managing the transaction logs. It also allows you to easily schedule jobs to occur. So why use anything else The main reason to customize backup jobs is for the control and flexibility you will gain. Various scenarios require file and filegroup backups to one or more devices. We also looked at how files and filegroups can be specified through database creation and modification scripts. In this section, we ll look at the commands and operations necessary to perform the types of database backups discussed.
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When managing backup security permissions, systems and database administrators normally take the most utilitarian view that is, giving full permissions to those who need to perform backups. In various database products (including previous versions of SQL Server), managing these permissions was quite difficult. In SQL Server 7, however, Microsoft has included several built-in security roles for easing the administration of security. (We covered these in detail in 4.) By default, the system administrator (the SA login) has the permissions to perform any operations on the database. All members of the Windows NT Administrators group are automatically mapped to this login, as well. Although you can assign logins to roles at the server level, it is more likely that you ll want to give specific operators permissions on existing databases. To perform backups of a database, users must have db_owner or db_backupoperator permissions on the database. Once the appropriate permissions have been assigned, you can move on to the actual steps required for performing backups.
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The term backup media is used to describe any type of storage on which you can record data. The term refers to physical storage and is limited to disk or tape. A backup device resides on the media and is a logical storage structure that stores information in an organized format. Before you can execute a backup or recovery operation, you must first decide which type of device you want to store your information on. The choices available in SQL Server 7 include the following: w Disk devices As the name implies, disk storage devices reside on hard disks. A disk device is specified by a full pathname that points to a file within the file system (for example, c:\mssql7\data\Database1Backup.bak). When creating
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backup files, you should be sure to use an organized naming convention and verify that locations to which backups will be stored have enough space. When performing backups, you can refer to the backup device using its physical name (the full path to the file) or with a logical name given to this device. The logical name is preferred, because it abstracts the underlying file system path and filenames, and reduces the chance that you ll make mistakes when specifying where your backups should dump information. When storing files, you may choose to use remote storage devices. For example, to store information on a remote server, you can use the Universal Naming Convention (UNC) pathname \\server\share1\dbdump1.bak. Of course, the SQL Server account must have access to this remote share before data can be dumped remotely. When implementing disk devices and choosing file locations, you should carefully consider the reasons for the backup. In general, it is not advisable to store backups on the same physical disks as the databases themselves, because if the disk itself fails, both the database and the backups will be lost. You can circumvent this sort of loss by using fault-tolerance technology (such as RAID, mentioned earlier), or by providing frequent backups of the database dumps and storing them on a remote machine or on tape. Additionally, if you want to provide only for point-in-time recovery (and not against hardware failures), storing files to the same disk is acceptable. s Tape devices If the server on which SQL Server resides contains a tape backup device, you can use it for storing backups. The main advantages of tape media are that storage is less expensive and that the media is removable. However, tape storage devices have slower access times and slower throughput. Local tape devices in SQL Server 7 use the notation \\.\tape0, \\.\tape1, and so forth. SQL Server 7 does not support the direct use of remote tape storage devices for backups. However, if you want to back up remotely, you might choose to first dump data to a disk device and then back it up over the network using another utility. Named Pipe devices Named Pipe devices are not supported directly through the SQL Server 7 administrative tool, but can be accessed via the BACKUP command. This method is provided mainly for third-party software products to receive and process information from SQL Server. (We looked at some of these in 5.) Named Pipes are logical network connections that can be accessed from the same machine or other computers, such as clients or other servers.
To create a disk, tape, or Named Pipe dump device, you can use Enterprise Manager or the sp_addumpdevice stored procedure. For example, the following command creates a disk dump device using Transact-SQL:
EXEC sp_addumpdevice 'disk', 'DatabaseDumpDevice', 'c:\mssql7\data\DBDump.bak'
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