MySQL open source software is provided under the GPL License.
OEMs, ISVs and VARs can purchase commercial licenses.
MySQL Cluster is a real-time open source transactional database designed for fast, always-on access to data under high throughput conditions.
It is available as both open source and commercial editions. The Community (OSS) Edition is available under the free software/opensource GNU General Public License (commonly known as the "GPL"). MySQL Cluster is provided as a separate download so that users can have access to builds from the latest source releases of the MySQL Cluster Carrier Grade Edition (http://www.mysql.com/downloads/clustercge/).
Get up and running fast. Download the Quick Start Guide for your platform below: