Cause
A higher-bound subpartition was specified before the lower-bound subpartition in ALTER TABLE MERGE SUBPARTITIONS statement.
A higher-bound subpartition was specified before the lower-bound subpartition in ALTER TABLE MERGE SUBPARTITIONS statement.
Change the representation of a subpartition high bound to bring its length within legal limit.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
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