Cause
User attempt to reuse a lower-bound partition in ALTER TABLE MERGE PARTITIONS statement as the resulting partition which is illegal.
User attempt to reuse a lower-bound partition in ALTER TABLE MERGE PARTITIONS statement as the resulting partition which is illegal.
Specify EXCHANGE PARTITION for a Range,List,System, or Hash partition only
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
https://community.oracle.com/message/3335078
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