How To: Mosaic rasters to an ArcSDE raster dataset stored in 8.x schema?
At ArcGIS/ArcSDE 9.0, if your raster dataset is stored in 8.x schema, such as when upgrading the ArcSDE server from 8.3 to 9.0, or the SDERaster command was used to load raster data, ArcGIS does not mosaic data to the raster dataset.
To mosaic to a raster dataset stored in 8.x schema, register the raster dataset so that an OBJECTID column is added to the schema. The syntax is:
SDETable -o alter_reg -t <raster name> -c objectid -C SDE