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Creating SQL Server Logins
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After you set the appropriate authentication mode for your installation of SQL Server, you need to create logins. A login is used to authenticate a user before he or she connects
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to the database server. To create a SQL Server login based on a Windows NT user or group in Enterprise Manager, do the following: 1. Select the server for which you want to create a login. Expand the Security folder. Right-click Logins and select New Login. You will see this dialog box:
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2. In the Name field, specify a unique name for the new login. This is the name a user must use to connect to the database server. 3. For Authentication, select SQL Server Authentication and enter a password to be used by a user or application to log in to the database. 4. Specify a default database to which the user will connect. Note that you may need to grant database permissions (described later) separately. 5. Click OK and then verify the password to create the new login. You can optionally specify server roles and database roles using the other tabs in this dialog box (described later). SQL Server login information is stored in the syslogins system table (located in the master database). Password information stored in this table is encrypted. When a user attempts to authenticate, SQL Server verifies whether a login and password are present in this table, and if so, allows the login.
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When administering user permissions in a network environment, maintaining logins at both the network operating system level and at the database level can be tedious, time-consuming, and error-prone. Windows NT accounts (groups and users) can be directly granted permissions to access a Microsoft SQL Server database if you re using
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Windows NT Security or mixed-mode security. In most cases, it is preferable to grant access to an entire group, to make administration easier. Consider placing all SQL Server users in a new Windows NT group or groups. If you re working in a domain-based environment, you can assign logon permissions to either global or local groups. Windows NT Authentication is supported by both Windows 95/98 and Windows NT clients, provided the users have accounts. Other client types (such as MS-DOS, Macintosh, and UNIX users) can only use SQL Server Authentication.
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NOTE: By default, members of the Windows NT Administrators and Domain Administrators groups are granted system administrator (SA) access to the database. Since the default password for the sa account is blank, you should change it immediately after installation.
To create a SQL Server login based on a Windows NT user or group in Enterprise Manager: 1. Select the server to which you want to create a login. Expand the Security folder. Right-click Logins and select New Login. You ll see this dialog box:
2. In the Name field, specify the name of a Windows NT user or group to which you want to grant login permissions. If you re working in a multidomain environment, you also need to specify the complete name, including the domain (such as Engineering\JoeUser). 3. Leave the Authentication setting as Windows NT Authentication. Users will not need to enter a username or password to gain access. For Security Access, choose whether this group should be granted or denied access.
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4. Specify a default database to which the user will connect. Click OK to create the new login. You can optionally specify server roles and database roles using the other tabs in this dialog box (described later). When a user attempts to log in to a database using Windows NT Authentication, SQL Server attempts to find a matching login in the syslogins table. If a Windows NT user attempts to log in from a nontrusted domain, he or she will be required to enter a username and password for the domain in which the SQL Server resides. The same will occur if the user is not a member of any Windows NT group or user account that has permissions to log in. In either case, if a login exists, the user is allowed to connect; otherwise, an error message is returned and the user is given a chance to provide a SQL Server login (as long as mixed-mode security is enabled). To keep track of accounts when mixed-mode security is used, database administrators should not create SQL Server login names that have the same names as Windows NT user accounts.
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