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The RESTORE command can be used to view information about backup devices and their contents. (Again, we ll cover this information in 7.)
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Database Consistency Checker Commands
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If you re used to the lethargic performance of Database Consistency Checker (DBCC) on earlier versions of SQL Server, you ll be pleasantly surprised to find that the checks now run much more quickly and with less impact to overall server performance. Table 6-3 provides a list of DBCC commands that you can use when working with database backups and integrity checks. These commands can be run directly from within SQL Query Analyzer or via scheduled jobs. For a complete list of DBCC commands (along with their syntax), see SQL Server 7 Books Online. Now that we have looked at some of the ways to plan for and manage backups, let s move on to actually performing these operations.
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The Database Maintenance Plan Wizard
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Microsoft has realized that many SQL Server users don t care about the behind-thescenes work performed by database servers. Users are more interested in making sure that information is backed up regularly; we want solutions that are simple yet powerful. The Maintenance Plan Wizard is a valuable tool for meeting these goals. It is accessible through Enterprise Manager, and provides a step-by-step walkthrough of the types of information you must provide before implementing a good backup solution. The wizard then uses this information to create and schedule the necessary database backup operations. Although the Database Maintenance Plan Wizard makes it easy to implement backups, you should not let this tool fool you into thinking that these operations will take care of all of your work. Before implementing the basic operations, you should ensure that you have clearly defined your data protection plans before beginning to walk through
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Performing Database Backups
Command DBCC CheckDB
Function Verifies internal structure of database objects. Removes unused space to reduce the size of data files. Shrinks a single data file to recover unused space. Provides syntax for a specific DBCC command. Verifies proper usage of space in database files. Verifies that all filegroups are available.
Notes Should be run regularly to check for and correct minor database errors. Used to recover disk space. Used to recover disk space.
DBCC ShrinkDatabase DBCC ShrinkFile DBCC Help DBCC CheckAlloc or DBCC NewAlloc DBCC CheckFileGroup DBCC CheckTable
Table 6-3.
DBCC Commands and Their Functions
these steps. With that out of the way, let s start looking at how you access the Database Maintenance Plan Wizard and respond to the various prompts you ll receive: 1. In Enterprise Manager, select the server for which you want to create the plan. 2. From the Tools menu, select Database Maintenance Planner. Click Next at the introduction screen to begin the process. The wizard will guide you through a series of pages and selections. 3. Select Databases On the first page of the wizard (shown in Figure 6-13), you ll be given the option of backing up one or more databases on your server. Subsequent steps will use the database(s) you select in this step. The various options include: s All Databases This option is best if you want all the databases on this server to be backed up at the same time. In environments where there is little activity during certain hours of the day, backing up all databases is the easiest method to administer. Also, as new databases are created on the server, they, too, will be backed up with the jobs created.
Verifies the integrity of all the data for a table within a database.
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Should be run regularly to check for minor problems in data allocation. Used when databases are not functioning properly. Used if errors are being returned from some queries.
SQL Server 7 Backup & Recovery
Figure 6-13.
Selecting databases to back up
All System Databases (master, model, and msdb) This backs up all of the system databases that are required for proper functioning of SQL Server 7. You should back up at least the master database after any changes are made to the system tables. All User Databases (all databases other than master, model, and msdb) Choose this option when you plan to back up the system databases separately or with a different schedule. It will ensure that any new databases created on the server will also be backed up by the job. These Databases If you want to use different backup plans and schedules for different sets of databases, you can pick and choose from the Database table which databases will be backed up together. It will be slightly more difficult to manage and keep track of multiple backup jobs and schedules, so it s very important that you document which databases are being backed up and when the process occurs. Also, note that if you add new databases to this server, they will not automatically be backed up by the jobs you create here.
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