Take a look at Oracle Berkeley DB: "Berkeley DB is not exposed to the end-user. It is totally hidden below the SQLite APIs. It acts as the storage engine in pl

Take a look at Oracle Berkeley DB: "Berkeley DB is not exposed to the end-user. It is totally hidden below the SQLite APIs. It acts as the storage engine in place of SQLite's own BTREE. An application written to use the SQLite version 3 API can switch to Oracle Berkeley DB with no code changes, simply re-link against Berkeley DB." http://www.oracle.com/technetwork/database/berkeleydb/overview/sql-160887.html http://www.oracle.com/technetwork/database/berkeleydb/overvi... I haven't had time to read the full paper, but it looks very interesting.