Dear All, Forgive my ignorance in asking you this. The uniqueidentifier's length is only 38 characters right. Irrespective of nationality and the usage of native language the uniqueidentifier's length is 38 according to my knowledge. My colleague refutes this and says it should be 255 charaters. The newID function does only create unique codes with in this 38 character length isn't it? And please explain its performance if its indexed and clusterd. Thank you and My advanced gratitude.