
3.3 Index Organized Tables and Clusters 75
Chapter 3
Last, but not least, bitmap indexes, bitmap join indexes, star queries,
and star transformations were all introduced in previous versions of
Oracle Database. It is possible that the optimizer has improved to the
point where some of these tricks and techniques are no longer useful.
3.3 Index Organized Tables and Clusters
Are IOTs and clusters used in data warehouses? The answer to that question
is yes, but their use is more likely in 3
rd
normal form data warehouse mod-
els than in dimensional-fact models. One of the biggest problems with
IOTs and clusters is overflow degradation of performance. Changes ...