Database
- Relational

1. Oracle
2. MySQL
3. MS SQL Server
4. PostgreSQL
5. DB2

- NoSQL

1. Document Store - MongoDB
2. Key-Value Store - REdis
3. Wide Column Store - Cassandra
4. Graph DB - Neo4J
5. Time Series Db - InfluxDB

- NewSQL

1. VoltDB
2. MemSQL
3. NuoDB

Data is stored with timestamp

• Measurements - Table
• Tags - Indexed column
• Fields - unindexed column

Line protocol

[key][fields][timestamp]

Key

# measurement only
cpu

# measurement and tags
cpu,host=serverA,region=us-west

# measurement with commas
cpu\,01,host=serverA,region=us-west

# tag value with spaces
cpu,host=server\A,region=us\ west

Timestamp

DMDxUH

http://www.ncdc.noaa.gov/temp-and-precip/asos/