I changed oracle server version 9i1 with 9i2. The queries, for example:
select cl_start_date, cl_acall, cl_cu_id, cl_country, cl_rcode
from littlecalls
where cl_start_date>='01-jan-2002' and to_char(cl_start_date, 'Mon')=:mon
which used to complete in the old version, face problems now...