OS & Oracle

For the following statement, 9i, 10g  and 11g output the different cardinality and cost.

create table t1
nologging
as
select
trunc(dbms_random.value(0,25)) n1,
rpad(’x',40) ind_pad,
trunc(dbms_random.value(0,20)) n2,
lpad(rownum,10,’0′) small_vc,
rpad(’x',200) padding
from
all_objects
where
rownum <= 10000
;
update t1 set n1 = [...]

XMLType is an abstract type for programming, whose storage model can be unstructured storage or structure storage. 
Oracle XML DB uses XML schema as a mechanism for defining how the contents of an XMLType should be stored inside the database. Currently Oracle XML DB provides two options:

Unstructured storage. The content of the [...]