August 2015
Intermediate to advanced
672 pages
23h 1m
English
book
Expert Oracle Exadata, Second Edition
by Martin Bach, Karl Arao, Andy Colvin, Frits Hoogland, Randy Johnson, Kerry Osborne, Tanel Poder
Content preview from Expert Oracle Exadata, Second Edition
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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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