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Does ArcSDE support Oracle's LONG data type?
Oracle's LONG data type is not supported. Return code -55 (SE_ATTR_CONV_ERROR) displays in the ArcSDE error log files when creating a view containing this data type.
The layer or attribute table containing LONG data type is not viewable in ArcCatalog and the following message appears in the Preview window:
"The selection cannot be previewed."
If adding a layer or attribute containing LONG data type through ArcMap, the following warning message appears:
"Could not add the specified data object to the map."
Instead, use the NCLOB data type that is supported.