CHAPTER 4
Storage Indexes
Storage indexes are a useful Exadata feature that you never hear about. They are not indexes that are stored in the database like Oracle’s traditional B-tree or bitmapped indexes. In fact, they are not indexes at all in the traditional sense. They are not capable of identifying a set of records that has a certain value in a given column. Rather, they are a feature of the storage server software that is designed to eliminate disk I/O. They are sometimes described as “reverse indexes.” That’s because they identify locations where the requested records are not, instead of the other way around. They work by storing minimum ...
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