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values other than OFFLINE, ONLINE, and EMERGENCY, but those values are not directly settable using ALTER DATABASE. A database can have the status value RESTORING while it is in the process of being restored from a backup. It can have the status value RECOVERING during a restart of SQL Server. The recovery process is performed on one database at a time, and until SQL Server has nished recovering a database, the database has a status of RECOVERING. If the recovery process cannot be completed for some reason (most likely because one or more of the log les for the database is unavailable or unreadable), SQL Server gives the database the status of RECOVERY_PENDING. Your databases can also be put into RECOVERY_PENDING mode if SQL Server runs out of either log or data space during rollback recovery, or if SQL Server runs out of locks or memory during any part of the startup process. I ll go into more detail about the difference between rollback recovery and startup recovery in 4. If all the needed resources, including the log les, are available, but corruption is detected during recovery, the database may be put in the SUSPECT state. You can determine the state value by looking at the state_desc column in the sys.databases view. A database is completely unavailable if it s in the SUSPECT state, and you will not even see the database listed if you run sp_helpdb. However, you can still see the status of a suspect database in the sys.databases view. In many cases, you can make a suspect database available for read-only operations by setting its status to EMERGENCY mode. If you really have lost one or more of the log les for a database, EMERGENCY mode allows you to access the data while you copy it to a new location. When you move from RECOVERY_ PENDING to EMERGENCY, SQL Server shuts down the database and then restarts it with a special ag that allows it to skip the recovery process. Skipping recovery can mean you have logically or physically inconsistent data missing index rows, broken page links, or incorrect metadata pointers. By speci cally putting your database in EMERGENCY mode, you are acknowledging that the data might be inconsistent but that you want access to it anyway.
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READ_ONLY | READ_WRITE
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These options describe the updatability of a database. They are mutually exclusive. The default for a database is READ_WRITE. As with the user access options, when you use ALTER DATABASE to put the database in one of these modes, you don t specify a value of ON or OFF, you just use the name of the option. When the database is in READ_WRITE mode, any user with the appropriate permissions can carry out data modi cation operations. In READ_ONLY mode, no INSERT, UPDATE, or DELETE operations can be executed. In addition, because no modi cations are done when a database is in READ_ONLY mode, automatic recovery is not run on this database when SQL Server is restarted, and no locks need to be acquired during any SELECT operations. Shrinking a database in READ_ONLY mode is not possible. A database cannot be put into READ_ONLY mode if there are any connections to the database. Whether SQL Server waits for the other connections to terminate or generates an error message is determined by the TERMINATION option speci ed.
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The following code shows how to set a database s updatability value to READ_ONLY and how to determine the updatability of a database:
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ALTER DATABASE AdventureWorks2008 SET READ_ONLY; SELECT name, is_read_only FROM sys.databases WHERE name = 'AdventureWorks2008';
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When READ_ONLY is enabled for database, the is_read_only column returns 1; otherwise, for a READ_WRITE database, it returns 0.
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