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Mosaic datasets use overviews to improve drawing performance. While troubleshooting overview issues, it may be necessary to delete them. Instructions provided describe the best method for deleting overviews.
Warning: Although it is possible to delete the overviews by going to the <MosaicDatasetName>.Overview folder in the workspace containing the relevant geodatabase, this may corrupt the mosaic dataset.
Note: The tool can also be accessed by opening the Remove Rasters From Mosaic Dataset tool (Toolbox > Data Management Tools > Raster > Mosaic Dataset).
Category = 2
Note: If the overview creation is canceled or fails, use 'Category = 3' as the definition query to remove the failed overviews.