Time series databases
A time series database (TSDB) is a system that is optimized for handling time series data. It allows users to perform CRUD operations on various time series organized as database objects. It also provides the ability to perform statistical calculations on the series as a whole. Although TSDBs are not entirely a new technology we are seeing a renewed interest in the these databases primarily in the realm of IoT applications. This is being facilitated by many open source and commercial platforms (such as OpenTSDB, InfluxDB, Druid, BlueFloodDB etc.) that have mushroomed recently. Its also worth mentioning that some of these systems use other distributed databases such Cassandra and HBase as their underlying storage engine.