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Database Read-Only (READ_ONLY or READ_WRITE)
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You can use this option to control whether updates are allowed on the database. When set to TRUE in SQL Server Management Studio or ON when using the ALTER DATABASE command, users can only read from the database and are not permitted to modify data. When set to FALSE, the read and write operations are permitted on the database. To change the state of this option, you must have exclusive access to the database.
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Part III
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Database State (DB_STATE_OPTION)
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You can use this option to control the state of the database. When set to NORMAL, the database is fully operational and available for use. When the database is set to CLOSED, the database is shut down cleanly and marked offline. The database cannot be accessed or modified while in this state. When set to EMERGENCY, the database is marked READ_ONLY, logging is disabled, and access is limited to members of the sysadmin fixed server role. The EMERGENCY database state is used primarily for troubleshooting purposes.
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Restrict Access (DB_USER_ACCESS_OPTION)
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You can use this option to control access to the database. In MULTIPLE mode all users are allowed to connect to the database as long as they have the appropriate permissions. Conversely, in the SINGLE mode only one user is permitted to access the database at a time. In the RESTRICTED mode only members of the db_owner, dbcreator, and sysadmin roles can connect to the database. Note
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Connection-level settings take precedence over the database-level settings, implying that if a database option is set at the database level and also is specified at the connection level, the connection-level setting is utilized.
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Viewing Database Details
The details of a database, such as the size, collation, filegroups, database options, and so on, can be viewed via SQL Server Management Studio or using the sp_helpdb stored procedure. The process used to do this is explained in the sections below.
Viewing Database Details with SQL Server Management Studio
The following steps explain the process of viewing the details of a database via SQL Server Management Studio: 1. Click the Start button, point to All Programs, select Microsoft SQL Server 2005, and then select SQL Server Management Studio. 2. Log in to the instance you want to use, and then click on the + sign next to Databases to expand the list of databases. 3. Select a database, right-click it, and then select Properties from the shortcut menu. The window shown in Figure 10-9 is displayed. You can then select the appropriate page from the left pane to view the required details.
10
Creating Databases and Database Snapshots
Figure 10-9 SQL Server Management Studio View Database Details.
Viewing Database Details with the sp_helpdb Command
The sp_helpdb <database_name> command lists the details of the database, as shown in Figure 10-10.
Figure 10-10 sp_helpdb <database_name> output.
Part III
Microsoft SQL Server Administration
If no database name is provided to the sp_helpdb command, the high-level details of all the databases in the instance get listed. In addition the command:
sp_dboption <database_name>
can be used to list all of the options that have been set for the database.
Deleting a Database
A database can be deleted via SQL Sever Management Studio, or via the DROP DATABASE command. Listed below are some important points to consider when dropping a database:
A database cannot be deleted if it is in use. Dropping a database deletes the database from an instance of SQL Server and deletes the physical disk files used by the database. The only exception is when the database or any one of the files is offline. In this case, the disk files are not deleted and must be deleted manually from the file system. A database can be deleted regardless of its state: offline, read-only, suspect, and so on. However, once deleted it can be re-created only by restoring a backup. Only users having CONTROL permission on the database can delete it. If a database participates in log shipping, the log shipping needs to be removed before deleting the database.
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