All of the database-like features of AMPS are built from the ground up for AMPS. This includes content filtering, SOW topics, views, aggregates, topic joins, historical replay, and so on. The implementation is specifically designed and tuned for the way AMPS works and only provides the functionality used by AMPS. Because the functionality is written specifically for AMPS, this approach also improves performance and reduces resource usage.
AMPS does use SQLite for maintaining instance statistics. No other functions in AMPS use SQLite or depend on SQLite.