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Oracle Exadata Survival Guide by Mary Mikell Spence, David Fitzjarrell

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CHAPTER 3

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Storage Indexes

Storage indexes may be the most misunderstood and confusing part of Exadata. The name conjures images of conventional index structures, such as the B-tree index, bitmap index, LOB index, and others, but this is a far different construct, with a very different purpose, from any index you may have seen outside of Exadata. Designed and implemented in a unique fashion, with a purpose that is very different from any conventional index, a storage index catalogs data in uniform pieces and records the barest minimum of information an index could contain. Although the data is minimal, the storage index could be one of the most ...

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