What is the difference between a user without a login and orphaned users?

Question

Normally when orphaned users are discovered they are just connected back to their associated logins. However a user without login is one that does not have and cannot have an associated login. 18 нояб. 2013 г.

What is an orphaned User?

Orphan user are the one which are present in the database level but their relevant logins not present in the server level. Orphan users are generated when you take a database backup from one server and restored on another server (Mostly during DB migration).

What is the difference between logins and users?

A Login is an identity used to connect to a SQL Server instance. A User allows you to log into a SQL Server database and is mapped to a Login.

The WITHOUT LOGIN clause creates a user that isn't mapped to a SQL Server login. It can connect to other databases as guest. Permissions can be assigned to this user without login and when the security context is changed to a user without login, the original users receives the permissions of the user without login.

What is orphaned logins in SQL Server?

Orphaned users in SQL Server occur when a database user is based on a login in the master database, but the login no longer exists in master. This can occur when the login is deleted, or when the database is moved to another server where the login does not exist.

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