MongoDB queries don’t always return all matching documents
I have moved from Mongo to Cassandra in a financial time series context, and it&#x27;s what I should have done straight from the getgo. I don&#x27;t see Cassandra as that much more difficult to setup than Mongo, certainly no harder than Postgres IMHO, even in a cluster, and what you get leaves <i>everything</i> else in the dust if you can wrap your mind around its key-key-value store engine. It brings enormous benefits to a huge class of queries that are common in timeseries, logs, chats etc, and with it, no-single-point-of-failure robustness, and real-deal scalability. I literally saw a 20x performance improvement on range queries. Cannot recommend it more (and no, I have no affiliation to Datastax).