January 2013
Intermediate to advanced
667 pages
19h 20m
English
Content preview from Oracle Exadata Recipes: A Problem-Solution Approach
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CHAPTER 19
Storage Indexes
Storage indexes are a feature unique to Exadata. A storage index is a memory-based structure that reduces the amount of physical I/O required by the cell when accessing data via Exadata Smart Scan. A storage index tracks the minimum and maximum values retrieved based on your application’s WHERE clause predicates and builds storage indexes based on usage.
In contrast to traditional B*Tree indexes, which tell Oracle exactly where to find a segment’s extents, storage indexes behave like “anti-indexes”; their purpose is to tell Oracle with absolute certainty that a requested extent does not exist in specific locations, ...
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