difference b/w oracle and mySQL

what are the difference between MySQL and Oracle..?

MySQL is free and  open source. Oracle is enterprise and expensive. However, plenty of large sites such as Facebook and Digg run perfectly fine on MySQL.

Oracle is used by larger organizations because of many reasons:

1. The ability to audit.
2. Oracle also has better user management and security for larger enterprises.
3. Enterprise-level management tools

MySQL is free, cheap to manage, efficient, fast, scalable, and open-source.

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