ORA-01867 in 10G XE, not in 9i

Question

the below procedure works fine in oracle 9i but not in oracle 10g xe.
is the format to specify day to second interval different in oracle 10 G?
declare
v_min NUMBER;
v_sec NUMBER;
time_taken INTERVAL DAY TO SECOND;
begin
v_min:=2.3;
v_sec:=4.7;
time_taken:=TO_DSINTERVAL('0 0:'||TO_CHAR(V_MIN)||':'||TO_CHAR(V_SEC));
end;SQL> declare
2 v_min NUMBER;
3 v_sec NUMBER;
4 time_taken INTERVAL DAY TO SECOND;
5 begin
6 v_min:=2.3;
7 v_sec:=4.7;
8 time_taken:=TO_DSINTERVAL('0 0:'||TO_CHAR(V_MIN)||':'||TO_CHAR(V_SEC));
9 end;
10 .
SQL> /
declare
ERROR at line 1:
ORA-01867: the interval is invalid
ORA-06512: at line 8

Answer 1

Two points that come in mind:
1) if i am correct, in the interval is not allowed fractional parts of minutes, only of seconds, that is why i have certain doubts that your example taken literally works in 9i ( at least in 9.2.0.6 it gives me the same error message).
2) you have a bunch of implicit to_char conversions, so in general case you can't predict how your strings looks like, i would recommend to take conversion with a format mask and specify also in the to_dsinterval NLS_NUMERIC_CHARACTERS.
Best regards
Maxim