Returns the length of a value. The argument must be type BINARY, VARBINARY, BLOB, CLOB, DBCLOB, VARGRAPHIC, GRAPHIC, VARCHAR, or CHAR. The result is a large integer. It is the length, in bytes, of the argument. The length of strings includes blanks.
Example:
Assume table T1 has a GRAPHIC(10) column.
SELECT OCTET_LENGTH(C1) FROM T1
The result is 20.