It reads from memory, not the database. It is true that querying a database vs. using in-JVM-memory snapshots are not the same. They both have different propert

It reads from memory, not the database. It is true that querying a database vs. using in-JVM-memory snapshots are not the same. They both have different properties. The case at hand was to analyze immutable data where working with snapshots makes sense. If, on the other hand, the case was to work with data in a highly transactional application, then snapshots make little or no sense.