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Restoring and Rebuilding the Master Database
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All information about database objects is stored within the system tables that reside on the master database. This is one of the reasons that a full database backup is recommended after any changes to database structure have occurred. An instance of SQL Server cannot start if the master database is corrupt, inconsistent, or unavailable. Although a good data protection plan hopefully will ensure that this does not happen, it is possible for the master database to be lost or become corrupted. The ideal way to fix the problem is to restore the information from a recent backup. To restore the master database, you ll need to start SQL Server in single-user mode. Then, you can restore it as you would any other database. The specific steps required to recover databases will be covered later in this chapter. Keep in mind that you will need to manually reapply any changes to database objects that have occurred since the last backup of master. The recommended practice is to make a full backup of master after any database structure or object changes. If this hasn t been done or isn t possible, then you should make sure that you maintain scripts for all database changes since the last full backup. But, what can you do if you don t have a valid backup of the master database or if SQL Server will not start Since it is critical to have a valid copy of this database to properly start and run SQL Server, a command-line utility called Rebuild Master can be used to re-create a default copy of the master database. Once this database has been re-created, you should be able to restart SQL Server and then restore from a recent backup of the master database. To rebuild the database, you ll need to have access to the SQL Server 7 CD-ROM (or to a network share that contains the installation files). The specific steps required to rebuild the master database are as follows:
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1. If it s not already shut down, stop the SQL Server service. 2. Run the rebuildm.exe file located in the binn directory for your SQL Server installation. By default, the path will be c:\mssql7\binn. The Rebuild Master application will prompt you for the source directory for the master database files:
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3. Click Browse and find the location of the master database files on your CD-ROM or on a network share. 4. Click Settings and specify the same character set, sort order, and Unicode collation settings you used when you installed SQL Server. 5. When you have made the appropriate settings, click Rebuild to start restoring the master database. Once you have recovered a valid copy of master, you should be able to start SQL Server in single-user mode and recover from a recent backup. If user database files are still available and valid, you can then reattach them to the server without the need to restore the files from a backup. We ll cover the commands for attaching databases in the next section.
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In addition to the standard data recovery operations you might need to perform, there are several other operations that might be useful. For example, copying and moving databases between servers can be accomplished using the standard backup and restoration operations. However, this method might be tedious or impractical when moving many or large databases between servers. Fortunately, there are many useful commands in SQL Server 7 that can be used for managing these tasks. In this section, we ll look at some ways in which you can deal with changing machine names, attaching and reattaching databases, and copying information.
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