What is Sql Server Clustered Index in Oracle terminology A clustered index in sql server like a dictionary or telephone directory. A,B,C,D it goes on.
If you look up with a name Ozgur you start O then z etc.

I would like a simple explaination for this concept for oracle savy users.

More information about Clustered Indexes in Sql Server.
What is a Clustered Index?
In Oracle terminology, it is an Index Organized Table, commonly referred to as an IOT.


  An index-organized table has a storage organization that is a variant of a primary B-tree. Unlike an ordinary (heap-organized) table whose data is stored as an unordered collection (heap), data for an index-organized table is stored in a B-tree index structure in a primary key sorted manner. Each leaf block in the index structure stores both the key and nonkey columns.