influxdb使用入门

参考：

https://blog.csdn.net/vtnews/article/details/80197045

https://docs.influxdata.com/influxdb/v1.6/tools/api/#write-http-endpoint

https://blog.csdn.net/vtnews/article/details/80197045

0.influxdb配置

默认配置文件目录：/etc/influxdb/influxdb.conf,配置文件详解见如下：

 https://www.cnblogs.com/guyeshanrenshiwoshifu/p/9188368.html

启动方式:service influxdb start，此种启动方式的启动脚本(程序的入口)在：/etc/init.d/influxdb

默认系统日志：/var/log/influxdb/influxd.log

1.resful插入和读取数据：

curl -i -XPOST "http://localhost:8086/write?db=mydb&precision=s" --data-binary 'test,hostname=server01 value=145465156'

curl -i -G 'http://localhost:8086/query?db=mydb' --data-urlencode 'q=SELECT * FROM "test"'

2.influxdb聚合函数的使用：

https://www.jianshu.com/p/a1344ca86e9b

https://docs.influxdata.com/influxdb/v1.7/query_language/spec/

 

3.客户端常用命令：

//注意key双引号value单引号

show tag keys from h2o_feet  查看表的tag

show field keys from h2o_feet  查看表的field

create database test 创建数据库

show databases 查看数据库

SHOW RETENTION POLICIES ON test 获取保留策略

#将数据库proxydb默认保留策略改为seven_day_only这个保留策略
CREATE RETENTION POLICY "seven_day_only" ON "proxydb" DURATION 7d REPLICATION 1 DEFAULT

#修改数据库proxydb的默认保留策略autogen为8760h
alter retention policy "autogen" on "proxydb" duration 8760h replication 1 default;


删除2016年1月1日之前发生的数据库中的所有数据
DELETE WHERE time < '2016-01-01'  通过time批量删除数据


删除与测量相关的所有数据h2o_quality以及标记randtag等于的位置3
DELETE FROM "h2o_quality" WHERE "randtag" = '3'

显示某个tag所有的值
show tag values from ppyunwg with key="action"

创建test表
insert test,type=tem,sensor=sensor01 value=3,is_deleted=0
测试正则表达式
select *from test where "sensor"=~/^(sensor01|sensor02)$/

查看订阅
SHOW SUBSCRIPTIONS
删除订阅
name: yun
retention_policy name                                           mode destinations
---------------- ----                                           ---- ------------
autogen          kapacitor-0a6f0d7b-430f-464d-a0b4-7f2946da67a0 ANY  [http://10.60.64.226:9092]
> drop subscription "kapacitor-0a6f0d7b-430f-464d-a0b4-7f2946da67a0" on "yun"."autogen"



kapacitor list tasks  kapacitor查看任务

influx提供离线聚合功能，将聚合结果算出并保存，需要时直接取数据，不需要实时聚合
https://docs.influxdata.com/influxdb/v1.2/query_language/continuous_queries/

查询cq：
SHOW CONTINUOUS QUERIES
删除cq:
DROP CONTINUOUS QUERY  ON 

cq示例：
CREATE CONTINUOUS QUERY cq_1d_rtc_masterstatic ON ppyun BEGIN SELECT max(f_user_num) AS f_user_num INTO  "5min_rtc_masterstatic" FROM rtc_masterstatic WHERE t_action = 'static' AND t_level = 'info' GROUP BY time(5min), t_room_id END

更多删除方法
https://docs.influxdata.com/influxdb/v1.4/query_language/database_management/#retention-policy-management

保留策略：

https://docs.influxdata.com/influxdb/v1.6/query_language/database_management/#retention-policy-management

 

group by time有默认边界,  当以天为间隔时，需要设置偏移量 group by time(1d,-8h)