WordPress.org

Authors: matt, andy, ryan, mdawaffe

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 on WordPress.com with dozens of DB servers spanning multiple datacenters.