- "What's not mentioned here but still important for improving efficiencies and precisons of queries, is that users should consider `spatial caching` and `tolerance` when executing spatial queries. If multiple spatial queries are going to be executed within a common extent, the use of spatial caching can significantly increase performance by reducing round trips to the data source. A feature class x,y tolerance can have an effect on the results of a spatial query and should be considered when executing spatial queries, particularly with feature classes that have unusually large x,y tolerances. For more information, please check out <a href=\"http://resources.esri.com/help/9.3/arcgisengine/dotnet/7b4b8987-a3f0-4954-980f-720e61965449.htm\">Resouces on ArcGIS engine</a>."
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