DBA_LOGSTDBY_UNSUPPORTED displays the schemas, tables, and columns in those tables that contain unsupported datatypes. Use this view when you are preparing to create a logical standby database. This view is for logical standby databases only.
Owner of the unsupported table
Name of the unsupported table
Name of the unsupported column
Displays the reason why the table is not supported by SQL Apply. If the structure of the table is unsupported (not just the datatype of some columns), then this view displays all columns in the table, with one of the following values displayed for each column in the table:
IOT with Overflow
IOT with LOB
Mapping table for physical rowid of IOT
IOT with row movement
AQ queue table
Unsupported Virtual Column
If the structure of the table is supported but certain columns in the table have unsupported datatypes, the ATTRIBUTE column will be NULL.