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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.
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.
The tool can also be accessed by opening the Remove Rasters From Mosaic Dataset tool (Toolbox > Data Management Tools > Raster > Mosaic Dataset).
Category = 2
If the overview creation is canceled or fails, use 'Category = 3' as the definition query to remove the failed overviews.