APP metrics，loT传感器数据和实时分析数据

观书散遗帙，探古穷至妙。这篇文章主要讲述APP metrics，loT传感器数据和实时分析数据相关的知识，希望能为你提供帮助。
万物互联时代，工业物联网产生的数据量比传统的信息化要多数千倍甚至数万倍，并且是实时采集、高频度、高密度，动态数据模型随时可变。传统数据库在对这些数据进行存储、查询、分析等处理操作时捉襟见肘，迫切需要一种专门针对时序数据来做优化的数据库系统，即时间序列数据库。

时间序列数据库(Time Series Database)是用于存储和管理时间序列数据的专业化数据库，具备写多读少、冷热分明、高并发写入、无事务要求、海量数据持续写入等特点，可以基于时间区间聚合分析和高效检索，广泛应用在物联网、经济金融、环境监控、工业制造、农业生产、硬件和软件系统监控等场景。

根据国际知名网站DB-Engines数据，时序数据库在过去24个月内排名高居榜首，且远高于其他类型的数据库，可见业内对时序数据库的需求迫切。相应的时序数据库产品近年来也快速发展，各大互联网企业包括谷歌、阿里巴巴、亚马逊都推出自己的时序数据库，业界使用较多的时序数据库主要有如下几种：

1、InfluxDB

InfluxDB是一款用Go语言编写的开源分布式时序、事件和指标数据库，无需外部依赖。该数据库现在主要用于存储涉及大量的时间戳数据，如DevOps监控数据，APP metrics，loT传感器数据和实时分析数据。

作为目前开源排名最高的时序数据库，InfluxDB支持数据存储策略(RP)和数据归档(CQ)，能够实时查询，数据在写入时被索引后就能够被立即查出，内置HTTP接口，安装管理很简单，并且读写数据非常高效。

2、Kdb+

kdb+/q被官方称为世界上最快的时间序列数据库，它使用统一的数据库处理实时数据和历史数据，同时具备CEP(复杂事件处理)引擎、内存数据库、磁盘数据库等功能。列式存储的特性，使得对于某个列的统计分析操作异常方便。

与一般数据库或大数据平台相比，kdb+/q具有更快的速度和更低的总拥有成本，非常适合海量数据处理，主要被用于海量数据分析、高频交易、人工智能、物联网等领域。在延迟性上有着苛刻要求的金融领域，kdb+有着独特的优势。

3、Prometheus

Prometheus是一套开源的系统监控报警框架，由工作在SoundCloud的Google前员工在2012年创建，作为社区开源项目进行开发，2015年正式发布，并在次年正式加入Cloud Native Computing Foundation。

作为新一代的监控框架，Prometheus具备强大的多维度数据模型，有多种可视化图形界面，使用pull模式采集时间序列数据，可以采用push gateway的方式把时间序列数据推送至Prometheus server端。

4、 Graphite

Graphite是一个开源实时的、显示时间序列度量数据的图形系统。Graphite并不收集度量数据本身，而是像一个数据库，通过其后端接收度量数据，然后以实时方式查询、转换、组合这些度量数据。

Graphite支持内建的Web界面，它允许用户浏览度量数据和图。它由多个后端和前端组件组成。后端组件用于存储数值型的时间序列数据，前端组件则用于获取指标项数据并根据情况渲染图表。

5、TimescaleDB

TimescaleDB是唯一支持完整SQL的开放源代码时间序列数据库，已针对支持全面SQL的快速提取和复杂查询进行了优化。它基于PostgreSQL，并且为时间序列数据提供了最好的NoSQL和Relational世界。

TimescaleDB使开发人员和组织能够更多地利用其功能：分析过去，了解现在和预测未来。在查询层面统一时序数据和关系数据可消除数据孤岛，并使演示和原型更容易实现。可扩展性和完整的SQL接口的结合赋予员工提出数据问题。

6、阿里云TSDB

作为我国科技公司的代表，阿里云时序数据库也入围了DB-Engines榜单。TSDB是一种集时序数据高效读写，压缩存储，实时计算能力为一体的数据库服务，可广泛应用于物联网和互联网领域，实现对设备及业务服务的实时监控，预测告警。

TSDB具备秒级写入百万级时序数据的性能，提供高压缩比低成本存储、预降采样、插值、多维聚合计算、可视化查询结果等功能，解决由设备采集点数量巨大、数据采集频率高造成的存储成本高、写入和查询分析效率低的问题。

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