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Database link is not supported by the GeoRaster routines. Therefore, you'll have to use either the Data Pump Export and Import utilities or the original Export and Import utilities to transfer GeoRaster data between databases.
In addition, you may use gdal_translate (with the georaster driver) to directly transport a georaster from one database to another - not very easy to script the commandline though if you have many georaster objects.
Hi Jeffrey, sorry for the late response...
I'm sorry to hear that dblink is not supported for georaster opperations (I'm also sorry that I'm growing more and more accustomed in Oracle's lack of functionality in spatial subjects)...
My task was to update 2869 georasters, over 105 databases.
I've already used the expdp/impdp approach (I'm more familiar with Oracle than with gdal) and it worked - it's not something I\d like to repeat, though.