基本环境

操作系统： centOS 7

postGreSQL ： 10

timescaleDB : 1.0 +

postGreSQL安装

Centos7 安装Postgresql10.5和PostGIS

timescaleDB 安装

PostgreSQL 时序数据库插件 timescaleDB 部署实践 – PostGIS + timescaleDB => PG时空数据库 — 德哥

官网安装文档：

TimescaleDB Docs – Installing

timescaleDB 设置

TimescaleDB Docs – Setting up TimescaleDB

实验

    -- 下载测试数据
    wget https://timescaledata.blob.core.windows.net/datasets/weather_small.tar.gz

    wget https://timescaledata.blob.core.windows.net/datasets/weather_big.tar.gz

    -- 创建数据库
    create database weather;

    -- 解压下载文件
    tar -zxvf weather_small.tar.gz

    -- 创建表结构
    psql -U postgres -d weather < weather.sql

    -- 导入数据
    psql -U postgres -d weather -c "\COPY conditions FROM weather_small_conditions.csv CSV"
    psql -U postgres -d weather -c "\COPY locations FROM weather_small_locations.csv CSV"


    -- 查询测试

    SELECT * FROM conditions c ORDER BY time DESC LIMIT 10;


    SELECT time, c.device_id, location,
    trunc(temperature, 2) temperature, trunc(humidity, 2) humidity
    FROM conditions c
    INNER JOIN locations l ON c.device_id = l.device_id
    WHERE l.environment = 'outside'
    ORDER BY time DESC LIMIT 10;


    SELECT date_trunc('hour', time) "hour",
    trunc(avg(temperature), 2) avg_temp,
    trunc(min(temperature), 2) min_temp,
    trunc(max(temperature), 2) max_temp
    FROM conditions c
    WHERE c.device_id IN (
        SELECT device_id FROM locations
        WHERE location LIKE 'field-%'
    ) GROUP BY "hour" ORDER BY "hour" ASC LIMIT 24;

注释

-- 数据库启动
systemctl start postgresql-10

-- 连接数据库
psql

-- 创建数据库
CREATE database weather_big;

-- 创建时序关系
CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;

-- 导入数据
psql -U postgres -d weather_big < weather.sql
psql -U postgres -d weather_big -c "\COPY conditions FROM weather_big_conditions.csv CSV"
psql -U postgres -d weather_big -c "\COPY locations FROM weather_big_locations.csv CSV"

欢迎大家关注 http://pnunu.cn/