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Dropping the Database in SQL Server Management Studio
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To follow the next section properly and build the database using code, it is necessary to remove the database just created. It is also handy to know how to do this anyway, for those times when you have made an error or when you wish to remove a database that is no longer in use. Deleting a database is also known as dropping a database.
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CHAPTER 3 DATABASE DESIGN AND CREATION
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Try It Out: Dropping a Database in SQL Server Management Studio
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1. If SQL Server Management Studio is not started, then start it up now and expand the nodes until you see the database ApressFinancial. 2. Right-click ApressFinancial to bring up the context menu. 3. Click the Delete option, as shown in Figure 3-14.
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Figure 3-14. Deleting a database within SSMS 4. The dialog shown in Figure 3-15 will display. Select Close Existing Connections and then click OK.
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Figure 3-15. Selecting to delete a database in the Delete Object dialog The first check box, Delete Backup and Restore History Information for Databases, gives you the option of keeping or removing the history information that was generated when completing backups or restores. If you want to keep this information for audit purposes, then uncheck the box. The second check box is very important. If there is a program running against a database, or if you have any design windows or query panes open and pointing to the database you want to delete, then this option will close those connections. If you are deleting a database, then there really should be no connections there. This is a good check and
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CHAPTER 3 DATABASE DESIGN AND CREATION
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will prevent accidents from happening, and it also allows any rogue databases to be removed without having to track down who is connected to them. 5. Click OK. The database is now permanently removed. When you click the OK button, SQL Server actually performs several actions. First, a command is sent to SQL Server informing it of the name of the database to remove. SQL Server then checks that nobody is currently connected to that database. If someone is connected, through either SQL Server Query Editor or a data access method like ADO.NET, then SQL Server will refuse the deletion. Only if you select Close Existing Connections will this process be overridden For SQL Server to refuse the deletion, it does not matter if anyone connected to the database is actually doing anything; all that is important is the existence of the connection. For example, if you selected ApressFinancial in Query Editor, and then returned to SQL Server Management Studio and tried to drop the database, you would see the error shown in Figure 3-16.
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Figure 3-16. Failed database deletion
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Tip Errors like the one shown in Figure 3-16 provide hyperlinks to documentation that can give you further help.
Once SQL Server has checked that nobody is connected to the database, it then checks that you have permission to remove the database. SQL Server will allow you to delete the database if it was your user ID that created it, in which case you own this database and SQL Server allows you do what you want with it. However, you are not alone in owning the database. If you recall from 1, there was mention of the sa account when installing SQL Server. Since it is the most powerful ID and has control over everything within SQL Server, there were warnings about leaving the sa account without any password and also about using the sa account as any sort of login ID in general. This section also mentioned that the sa account was in fact a member of the sysadmin server role. A role is a way of grouping together similar users who need similar access to sets of data. Anyone in the sysadmin role has full administrative privileges and this includes rights to remove any database on the server. So whether you are logged in as yourself or as sysadmin, take care when using SQL Server Management Studio to drop a database.
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