Oracle today launched Oracle 10g XE, a free version of its Database product-line. Available as a free download of 150MB download, it is intended for the Developers who want to test out their applications with the Oracle Database.
Ofcourse, there are some limitations in this free version. It can store up to 4GB of user data, use up to 1GB of memory, and use one CPU on the host machine, though Oracle Database XE can be installed on any size host machine with any number of CPUs.
Oracle has posed the biggest challenge to MySQL, after the Oracle's failed attempt to acquire MySQL failed. For we know, Oracle is a much serious database than MySQL.

