Hi Friends, I am restoring the Tes1 database by backup of another database Test2 and the "dbo" user is not mapped with any login on Test2 database. However, when restoration is completed on Test 1 from Test2 database backup I found the dbo user of Test1 database by default it is mapping with another login e.g. "user1". So how can I change the "dbo" login on Test1 database because I have to make similar the user "user1" on Test1 database which would be mapped of "user1" login? Note: Before restoration, when I checked the "user1" login mapping specified â€œdboâ€ user as a member and I am not able to uncheck the â€œdboâ€ user in mapping. Even, I am not able to change and drop the â€œdboâ€ user on Test1 database. Please provide any method to resolve this.