问题描述：
import操作，待导入文本想使用空格作为分割符，import命令加上了MODIFIED BY COLDEL0x20 ，但是却报错SQL3017N A delimiter is not valid or is used more than once.
重现步骤：
$ cat t1.del
Tue Sep 10 00:02:00
Wed Sep 11 00:03:00
Thu Sep 12 00:04:00
$ db2 "create table t1(WEEKDAY char(10), MONTH char(10), MONTHDAY char(10), TRANSTIME char(10))"
DB20000I The SQL command completed successfully
$ db2 "import from t1.del of del MODIFIED BY COLDEL0x20 insert into t1"
SQL3109N The utility is beginning to load data from file "t1.del".
SQL3017N A delimiter is not valid or is used more than once.
SQL3110N The utility has completed processing. "0" rows were read from the
input file.
原因分析：
空格和换行均不能作为行分割符，IBM信息中心Delimiter considerations for moving data对此有说明：
There are a number of restrictions in place that help prevent the chosen delimiter character from being treated as a part of the data being moved. First, delimiters are mutually exclusive. Second, a delimiter cannot be binary zero, a line-feed character, a carriage-return, or a blank space. As well, the default decimal point (.) cannot be a string delimiter. Finally, in a DBCS environment, the pipe (|) character delimiter is not supported.