Month: August 2010

Unique and non-unique non-clustered indexes on a unique clustered index

In the last weblog post I have talked about the difference of unique and non-unique clustered indexes. As you have seen SQL Server uses an internal overhead of 4 bytes (the so-called uniquifier) to make non-unique clustered index rows unique. Today I want to work out the difference between unique and non-unique non-clustered indexes defined …

Unique and non-unique non-clustered indexes on a unique clustered index + read more

Unique and non-unique SQL Server indexes on a heap table

In the upcoming weblog postings I want to work out the differences between unique and non-unique indexes in SQL Server. I assume that you already know the concepts about clustered- and non clustered indexes and how they are used in SQL Server. In the past I’ve done a lot of trainings and consulting regarding SQL …

Unique and non-unique SQL Server indexes on a heap table + read more