If geodatabase data is stored as Oracle Spatial, you have a choice of various index schemes, such as no spatial index, an R-tree index, a Fixed Quadtree index, or a Hybrid Quadtree index. Fixed indexing uses a linear quadtree index based on a tile size. Hybrid indexing uses both the fixed tile sizing and a variable sized tiling.
For more information on these indexing schemes, refer to the ArcSDE Configuration and Tuning Guide and the Oracle Spatial Documentation.
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