Хранение данных в 21 веке =)

Key-value stores: Redis, Scalaris, Voldmort, and Riak.
Document stores: Couch DB, MongoDB, and SimpleDB.
Record stores: BigTable, HBase, HyperTable, and Cassandra.
Scalable RDBMSs: MySQL Cluster, ScaleDB, Drizzle, and VoltDB.

http://feedproxy.google.com/~r/HighScalability/~3/hn8ieaM2v24/paper-high-performance-scalable-data-stores.html