Tables Without A Clustered Index
Why Clustered Indexes Matter in SQL Server In SQL Server, a clustered index defines the physical order of a table’s data, boosting performance and organization. Tables without clustered indexes, called heaps, can cause inefficiencies. This post explains why clustered indexes are essential and why heaps are problematic. What is a Clustered Index? A clustered index sorts and stores a table’s data in a B-tree based on the index key. Since it determines the physical data order, a table can have …