Oracle Error ORA-28664: a partitioned table may not be coalesced as a whole

Oracle Error Message

ORA-28664: a partitioned table may not be coalesced as a whole

Reason for the Error

User attempted to coalesce a partitioned IOT using ALTER TABLE COALESCE statement, which is illegal

Solution

Coalesce the table a partition at a time (using ALTER TABLE MODIFY PARTITION COALESCE)