Indicates whether a SQL Server login is a member of the specified fixed server role.
IS_SRVROLEMEMBER returns the following values.
login is not a member of role.
login is a member of role.
role or login is not valid.
Use this function to determine whether the current user can perform an action requiring the server role's permissions.
If a Windows login, such as Contoso\Mary5, is specified for login, IS_SRVROLEMEMBER returns NULL, unless the login has been granted or denied direct access to SQL Server.
If the optional login parameter is not provided and if the login is a Windows domain login, it may be a member of a fixed server role through membership in a Windows group. To resolve such indirect memberships, IS_SRVROLEMEMBER requests Windows group membership information from the domain controller. If the domain controller is not accessible or does not respond, IS_SRVROLEMEMBER returns role membership information taking into account the user and its local groups only. If the user specified is not the current user, the value returned by IS_SRVROLEMEMBER might differ from the authenticator's (such as Active Directory) last data refresh to SQL Server.
If the optional login parameter is provided, the Windows login that is being queried must be present in sys.server_principals, or IS_SRVROLEMEMBER will return NULL. This indicates that the login is not valid.
When the login parameter is a domain login or based on a Windows group and the domain controller is not accessible, calls to IS_SRVROLEMEMBER will fail and might return incorrect or incomplete data.
If the domain controller is not available, the call to IS_SRVROLEMEMBER will return accurate information when the Windows principle can be authenticated locally, such as a local Windows account or a SQL Server login.
The User Account Control (UAC) found in Windows Vista and Windows Server 2008 might also return different results. This would depend on whether the user accessed the server as a Windows group member or as a specific SQL Server user. For more information about User Account Control, see How to: Connect to SQL Server from Windows Vista.
This function evaluates role membership, not the underlying permission. For example, the sysadmin fixed server role has the CONTROL SERVER permission. If the user has the CONTROL SERVER permission but is not a member of the role, this function will correctly report that the user is not a member of the sysadmin role, even though the user has the same permissions.
The following example indicates whether the SQL Server login for the current user is a member of the sysadmin fixed server role.
IF IS_SRVROLEMEMBER ('sysadmin') = 1 print 'Current user''s login is a member of the sysadmin role' ELSE IF IS_SRVROLEMEMBER ('sysadmin') = 0 print 'Current user''s login is NOT a member of the sysadmin role' ELSE IF IS_SRVROLEMEMBER ('sysadmin') IS NULL print 'ERROR: The server role specified is not valid.'