OraMySQL
A simple set of programs to sync Oracle to a MySQL database
If you have just a small number of Oracle tables that you want to sync to a MySQL database, then this might be what you want. It is really simple. The concept is to add a small extproc to Oracle that sends UDP messages and then have a receiver for those messages that applies whatever it gets to MySQL. This is simple, but effective, but is also has a few drawbacks. But if you can live with them, this might be just what you are looking for.