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   "source": [
    "# Time series databases"
   ],
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   "source": [
    "Time series databases ([TSDB][1]) are specifically designed to store time series data, most importantly by storing time/value pairs. The use of time as a key index is perhaps the most important factor distinguishing them from, for example, relational ones.\n",
    "\n",
    "Because of the increased use of machine-generated data (e.g. IoT devices) they gained popularity relative to other database categories (by 180% over the last 24 months based on [DB-Engines][2])\n",
    "\n",
    "## Main types\n",
    "\n",
    "There are many different types of time series databases. As of October 2020 [DB-Engines][2] ranks the following ones as the top five:\n",
    "\n",
    "\n",
    "1. InfluxDB\n",
    "2. Kdb+\n",
    "3. Prometheus\t\n",
    "4. Graphite\t\n",
    "5. RRDtool\t\n",
    "\n",
    "\n",
    "[1]: https://db-engines.com/en/ranking/time+series+dbms\n",
    "[2]: https://en.wikipedia.org/wiki/Time_series_database"
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