The SET CURRENT DECFLOAT ROUNDING MODE statement changes the value of the CURRENT DECFLOAT ROUNDING MODE special register.
Set the CURRENT DECFLOAT ROUNDING MODE special register to ROUND_UP using a string constant and using a keyword.
SET CURRENT DECFLOAT ROUNDING MODE = 'ROUND_DOWN'
For more information, see SET CURRENT DECFLOAT ROUNDING MODE in the SQL Reference topic in the Information Center.