The following is the ORA-22296 error message, you can learn the cause and solution of the Oracle database error.
ORA-22296 invalid ALTER TABLE option for conversion of LONG datatype to LOB
Cause: An attempt was made to specify ALTER TABLE options which are disallowed during conversion of LONG datatype to LOB. The only ALTER TABLE options allowed during conversion of LONG datatype to LOB are the default clause and LOB storage clause for the column being converted to LOB.
Solution: Remove the disallowed options.
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