Non-relational databases are very widespread. Because the nature of the data is increasingly based on time series, this type of database has developed rapidly during the last decade. The best non-relational database for time series is called KDB. This database is designed to achieve performance with time series. There are many other competitors, including InfluxDB, MongoDB, Cassandra, TimescaleDB, OpenTSDB, and Graphite.
All of these databases have their pros and cons:
Pros | Cons | |
KDB | High performance | Price; very difficult to use because of a non-SQL language |
InfluxDB | Free, performant, quick start | Small community; poor performance analysis tool, no security |
MongoDB | Faster than rational ... |
