HyperDB is a very advanced database class that replaces WP's built-in DB functions. It supports:
* Read and write servers (replication)
* 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
It is based on the code currently used in production with 30+ DB servers on WordPress.com.
There are no reported vulnerabilities