open:제5회-모코 [EL]

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Jae-Hee Song Live Stream

- 소개
- Time Series Database

# Database 란

Database
- Relational
  - Oracle
  - MySQL
  - MS SQL Server
  - PostgreSQL
  - DB2
- NoSQL
  - Document Store - MongoDB
  - Key-Value Store - REdis
  - Wide Column Store - Cassandra
  - Graph DB - Neo4J
  - Time Series Db - InfluxDB
- NewSQL
  - VoltDB
  - MemSQL
  - NuoDB

# Time Series Data

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

![](https://goo.gl/DMDxUH)

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