SQLite
Is an embedded SQL database.
See sqlite.org.
Integrated in ball:each place has it's own (internal, byzantine replicated sqlite3 database.
Implementation Remark
There is a limited compatibility restriction between different versions of SQLite: different versions can read the same database, however even version differences in the 0.0.x range have been known to produce different results for identical input (though the input did not refer to any random data, current time etc.).
For this reason any Askemos network based on the current BALL SHOULD make sure that all nodes are compiled against the very same sqlite3 version.