ArcSDE - Northeast Arc Users Group

Spatial index• Spatial index is used to improve performance ofretrieving data• IBM DB2, Oracle, and SQL Server use grid tiles– Goal• Optimize the size of the grid tiles– Balance• Number of features referenced by each tile (features per tiles)• Number of tiles referencing each feature (tiles per feature)• Informix and Oracle Spatial use R-tree Rindexing– R-tree index constructs the index using the featureenvelope• Do not need to calculate any parameters for building R-tree R(built automatically)