Oracle Error ORA-39273: Cannot alter storage type of XMLType column: string

Oracle Error Message

ORA-39273: Cannot alter storage type of XMLType column: string

Reason for the Error

DBMS_METADATA_DIFF was comparing two XMLType columns with different storage types (CLOB, BINARY, OBJECT RELATIONAL). There is no SQL ALTER statement to change the storage type of an XMLType column.

Solution

The difference cannot be eliminated with an SQL ALTER statement.