![]() ![]() We can execute a Windows Management Instrumentation Command-line (WMIC) from a command prompt as below to get the domain level SID for Windows user account u007.īefore proceeding any further, we will execute the script below to create a user defined function ufn_StringToSID on the 3 SQL Server instances – SQLP1, SQLP2 and SQLP3 In Active Directory, we will create a Windows user account u007. All the servers are joined to the domain controller SQLDC. The configuration of our demonstration is three SQL Servers 2016 Developer Edition running Windows Server 2012 R2 Data Center. If this statement seems confusing, then the demonstration below would walk you through how they are connected to each other. 0x010600000000000901000000E286A25BE10CFF1FDF83DB82A0179E302B98EB23).įrom the high level, they might seem to be different, but the SID stored in SQL Server is actually a translation from the domain SID. The domain level SID representation is in string which looks like GUID (i.e. So, we are now talking about two SIDs, one is the domain level SID and the other is the SQL Server SID. This domain level SID is then used by SQL Server as source principal for SID. SIDs are unique within their scope (domain or local) and are never reused. In the scenario when a Windows user is created in the Active Directory, it is assigned a security identifier (SID) which is used to access domain resources. With this brief definition of login and user, we will now proceed to our demonstration to learn how these security concepts are connected to each other. ![]() Internally within SQL Server, a login is mapped and identified to a user using security identifier (SID). To allow access to a database, this login must be mapped to a database user. Once you are connected to SQL Server instance, you will typically need access to a particular database. Simply stated, a login allows you to connect to a SQL Server instance. There are two main types of logins Windows authenticated login and SQL Server authenticated login. This article will focus on the Windows login and provide some specific usage scenarios.Ī login is a security principal at the scope of the SQL Server instance, and a SQL Server instance can contain numerous databases. This article will explain these concepts through a step-by-step demonstration. ![]() ![]() Another important security concept tied to a login and user in SQL Server is Security Identifiers (SID). They are often, and incorrectly, considered to be pretty much one in the same so it is sometimes confusing to some SQL Server users. Logins and Users are basic security concepts in SQL Server. ![]()
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