-614 THE INDEX CANNOT BE CREATED OR ALTERED, OR THE LENGTH OF A COLUMN CANNOT BE CHANGED BECAUSE THE SUM OF THE INTERNAL LENGTHS OF THE COLUMNS FOR THE INDEX IS GREATER THAN THE ALLOWABLE MAXIMUM

Explanation
  The index could not be created or the length
of a column cannot be changed because the sum of the internal lengths
of the key columns would exceed the allowable maximum. The maximum
permitted key length is as follows:  For PADDED indexes, the sum of the length attributes of the columns
must not be greater than 2000-n, where n is
the number of columns that contain null values.
For NOT PADDED indexes, the sum of the length attributes of the
columns must not be greater than 2000-n-2m,
where n is the number of nullable columns and m is
the number of varying length columns.

System action
  The statement cannot be processed. The
specified index was not created or the length of the column was not
changed.

Programmer response
  The definition for the index must be modified
(possibly by eliminating one or more key columns) to reduce the length
of the key to the permitted maximum.

SQLSTATE
  54008