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MySQL Cluster Carrier Grade Edition is a clustered real-time database that is deployed in some of the most demanding subscriber database systems found in the telecommunications industry. In this paper we describe how MySQL Cluster Carrier Grade Edition can be used to build a scalable, highly available, geographically replicated Subscriber Database. We show how user-defined partitioning and distribution keys help a subscriber database to scale its performance linearly with cluster size, while maintaining the benefits of a relational database, accessed via an SQL API.