I am not sure, how to name this topic. May be, start by following questions. How important and effective is clustered index for a table? How to solve the heap fragmentation? Why my query is running slow most of the time for this particular table? Are the primary key and clustered index are same? There are developers still they understand that, we must need a primary key to create a clustered index. No, that’s not. Both are different used for different purpose. The primary key is to enforce the business logic. I.e. enforce the uniqueness. By default it will create a clustered index, if we are not…