White paper: An alternative to in-memory databases, key-value stores

Businesses often use in-memory databases or key-value stores (caching layers) when applications require extremely high performance. 

However, in-memory databases incur a high total cost of ownership and have hard scalability limits, incurring reliability problems and restart delays when memory limits are exceeded. 

In-memory key-value stores share these limitations and introduce architectural complexity and network latency as well.