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Notes This database is present only if the server is configured as a replication distributor ; replication services must be stopped before the distribution database can be restored. Master is required for proper operation of SQL Server. By default, model includes various system tables and views; database administrators and developers can create objects in model to make them available in all new databases. For scheduled jobs (such as backup and recovery operations) to be performed, the msdb database must be intact. Tempdb is automatically re-created whenever SQL Server is started and stopped; therefore, it is not necessary to back up or restore tempdb.
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Table 7-2.
SQL Server 7 System Databases
SQL Server Startup Options
In some cases, data or software corruption might prevent SQL Server from starting. One way to fix corrupt executable files is to restore from a backup. Alternatively, you can reinstall SQL Server 7 from the installation media. If the SQL Server installation cannot be started, or if you require special startup options, you can start SQL Server with the command-line switches shown in Table 7-3.
SQL Server 7 Backup & Recovery
By default, the d, e, and l switches are defined with startup values. Notice that the switches generally do not require spaces or quotation marks for the arguments. Although, for normal operations, you ll be satisfied with the default startup options, each of these switches can be quite helpful in troubleshooting and customization. There are several ways in which you can specify and use these switches. The first is to specify the options in the Services Control Panel applet (in Windows NT 4) or the Services Administrative Tools applet (in Windows 2000). Another, easier way is to specify the options by right-clicking the server name in Enterprise Manager and choosing Properties.
Startup Switch -d
Function Starts SQL Server in the master database. Starts SQL Server in the error log file. Starts SQL Server in the transaction log file for the master database. Prevents SQL Server from starting as a service. Starts SQL Server in Fail-Safe mode.
Notes If this option is not specified, the installation default settings from the Registry are used. If this option is not specified, the installation default settings from the Registry are used.
This can decrease the time it takes to start SQL Server, but using it generally isn t a good idea, because it is more difficult to administer and monitor. Uses the minimal options required to start SQL Server; can be useful when system-wide parameters have been configured incorrectly.
Table 7-3.
SQL Server Command-Line Switches
7:
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Startup Switch -m
Function Starts SQL Server in single-user mode.
Notes Allows only one user to connect to the SQL Server installation; useful for troubleshooting and performing maintenance operations that require databases to be unused; the CHECKPOINT process is suspended in single-user mode, so operations from the transaction log are not committed to disk. It is recommended that you specify an error log file (with the e switch) if this option is enabled.
Prevents events from being written to the Windows NT/2000 Application Event Log. Specifies the maximum level of precision for decimal and numeric data types. Uses startup settings stored in a Registry key. Specifies a trace flag for startup options. Prevents SQL Server from recording statistics on CPU time cache usage.
-pprecision_level
Valid values are 1 to 38; the default value is 28.
-sRegistryKeyName
Allows database administrators to store multiple sets of startup parameters within Windows NT/2000 Registry. Should only be used in special cases when trace flags are suggested by SQL Server Product Support. May increase overall system performance, but limits the ability to troubleshoot and measure performance.
/Ttrace#
Table 7-3.
SQL Server Command-Line Switches (continued)
SQL Server 7 Backup & Recovery
By clicking the Startup Parameters button on the General tab, you can add and remove various parameters, as shown here:
A third option is to start SQL Server from the command line. It is important to note that if you start SQL Server from the command line or by running the executable manually, the database server runs under the current user process. When you log off, the SQL Server instance is automatically shut down.
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