How are NCHAR, NVARCHAR, NTEXT, or MEMO data types mapped within the Oracle Server?
The Migration Workbench does not support the mapping of NCHAR, NVARCHAR, NTEXT, or MEMO data types from Microsoft SQL Server, Sybase Adaptive Server, or Microsoft Access to the NCHAR, NVARCHAR2, or NCLOB data types in an Oracle database. Instead, the default mapping for these data types is to CHAR, VARCHAR2, and CLOB in Oracle because these Oracle data types support Unicode and multi-byte character sets.