How to solve Oracle Database Error 12717 (ora-12717)

Oracle Error Code
   ora-12717

Description
   Cannot issue ALTER DATABASE NATIONAL CHARACTER SET when NCLOB, NCHAR or NVARCHAR2 data exists

Cause
   NCLOB, NCHAR or NVARCHAR2 data changed the representation to Unicode when converting to a multibyte character set and must be migrated.
How to Solve
   Remove NCLOB, NCHAR or NVARCHAR2 data as listed in the alert file. The above type data can be migrated by methods such as import/export.

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  ORA-12618    ORA-12619    ORA-12620    ORA-12717    ORA-12718    ORA-12719    ORA-12720  Others

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