That sounds very much like a CLUSTERED INDEX under Sybase ASE
(or the derivative Microsoft SQL Server). In those products, when you
create a clustered index, the data pages are sorted according to the
index sequence, and are used as the leaf pages in the index. A
clustered index does not have another leaf level.
>>> Simon Riggs <simon@2ndquadrant.com> >>>
As an aside, Index Organized Tables (IOTs) isn't just an Oracle term.
They first used the term, but the concept had already been implemented
in both Tandem (value-ordered) and Teradata (hash-ordered) before this,
as well as numerous OLAP systems. The concept doesn't look to be
patented.
If anybody is looking for a justification for IOTs, the reduction in
table volume for large tables is very high. IOTs are the equivalent of
removing all of the leaf blocks of the clustered index.