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The following functionality is currently not supported, but maybe supported in future:

• XMLType.
• Table cluster related DDL.
• IOTs (index-organized tables).
• Switchover/failover/flashback.
• Non-standard redo log block size (including 4k on 11gR2 on Advanced Format disks).
• Object datatypes (includes ADT, VARRAY, nested tables etc.).
• Only English version is available. Different languages will be supported in the future.No support for encrypted data (Transparent Data Encryption TDE).
• No support for compressed data. 
• External tables
• Nested tables 
• Multitenant Databases (PDB) in 12c

The following script will check to see if the tables are clustered:

Prompt Specify owner for the tables that you want to replicate
Prompt Specify table_name(s) for the tables that you want to replicate. % for all.
select owner, table_name, cluster_name, iot_name, iot_type 
from sys.dba_tables 
where (cluster_name is not null
and owner = upper('&owner')
and table_name like upper('&table_name');