Comment by gchpaco

Depends on the database, but Cassandra, for example, has quorum mode for writes, which requires a majority of the cluster members ack the write. This can be enabled on a per-query basis, and also for reads.

The other way of doing it is things like CRDTs (https://en.wikipedia.org/wiki/Conflict-free_replicated_data_...) which have a join operation for any two data values.

You have to keep it in the back of your mind that it's a thing, but working without consistency can be done.