yes make to JDBC or other type of connection first one
to oracle  second to mySQL and the rest is obvious.
it is so fast with good drivers (ODBC drivers are a
little slow)

I’ve used DBUnit’s import/export Ant tasks for this purpose. See http://dbunit.sf.net/. The export  task exports the data  to xml, the import fills the db from the xml. Works fine, but beware it has some bugs!

I have tried but my tables are so larg and it did not
work well.I have tested many ways but for these huge
table they did not work.

in what way you fail?
1- is it two slow?
2- data  fields are not compatible?
3- or only parts of the table are copied?

in 3rd case you may have forgotten to ask for rest of
result set in big returned list.
in 1'st case you must wait more.
in 2'nd case you have to recheck the compatibility
list in JDBC drivers.

I used oracle sql  loader but my problem  is about that
only part of records were copied and the problem was
realy funny it alarmed about length of one field but
it was enough large(CLOB) after that I changed all of
data type to varchar and it was ok.
thank you so much for your attention.
keep in tuch and let me know about yourself and your
job.