HyperDB

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HyperDB is a very advanced database class that replaces a few of the WordPress built-in database functions. The main differences are: * HyperDB can be connect to an arbitrary number of database servers, * HyperDB inspects each query to determine the appropriate database. It supports: Read and write servers (replication) Configurable priority for reading and writing Local and remote datacenters Private and public networks Different tables on different databases/hosts Smart post-write master reads Failover for downed host Advanced statistics for profiling WordPress Multisite It is based on the code currently used in production on WordPress.com with many MySQL servers spanning multiple datacenters.