influxdb的查询 用户管理 api 删除等命令
influxdb命令使用 1、数据构成 INSERT cpu_load_short,host=server01,region=us-west value=0.64,value2=0.86 1434055562000000000 第一部分:“cpu_load_short,host=server01,region=us-west” 第一部分称为key,key中包含了measurement name(类似表)和tags(tags又分为tag key和tag value,tags可以有多个) 注意:在tag value中的空格应以“\”加上空格表示,tags中的值必须是string类型,其实是起到索引的作用 第二部分:“value=0.64,value2=0.86” 第二部分称为Field,同样和tags的形式相同,都是键值对的形式,但是tags中的值必须是string类型,而Field中的值可以为Integer、float、Boolean、string类型, 若为Integer类型,则值后必须加“i”,否则该值为float类型, 比如value=23意味着这个值23是float类型, 而value=23i,意味着值23是Integer类型。 Boolean类型的值的表示方式有很多,直接写成:t, T, true, TRUE, f, F, false或 FALSE都可以。 第三部分(可选):“1434055562000000000” 第三部分称为Timestamp,是时间戳,如果该部分省略,则默认将当前时间的时间戳插入数据库,否则按照用户输入的时间戳插入。 注意:influxdb默认使用UTC时区展示数据 2、创建及使用数据库 CREATE DATABASE "testDB" --创建数据库 show databases --展示所有数据库 use testDB使用 --数据库 3、增删改查命令 查询表信息 SHOW MEASUREMENTS --查询当前数据库中含有的表 SHOW FIELD KEYS --查看当前数据库所有表的字段 SHOW series from pay --查看key数据 SHOW TAG KEYS FROM "pay" --查看key中tag key值 SHOW TAG VALUES FROM "pay" WITH KEY = "merId" --查看key中tag 指定key值对应的值 SHOW TAG VALUES FROM cpu WITH KEY IN ("region", "host") WHERE service = 'redis' DROP SERIES FROM <measurement_name[,measurement_name]> WHERE <tag_key>='<tag_value>' --删除key SHOW CONTINUOUS QUERIES --查看连续执行命令 SHOW QUERIES --查看最后执行命令 KILL QUERY <qid> --结束命令 SHOW RETENTION POLICIES ON mydb --查看保留数据 查询数据 SELECT * FROM /.*/ LIMIT 1 --查询当前数据库下所有表的第一行记录 select * from pay order by time desc limit 2 select * from db_name."POLICIES name".measurement_name --指定查询数据库下数据保留中的表数据 POLICIES name数据保留 删除数据 delete from "query" --删除表所有数据,则表就不存在了 drop MEASUREMENT "query" --删除表(注意会把数据保留删除使用delete不会) DELETE FROM cpu DELETE FROM cpu WHERE time < '2000-01-01T00:00:00Z' DELETE WHERE time < '2000-01-01T00:00:00Z' DROP DATABASE “testDB” --删除数据库 DROP RETENTION POLICY "dbbak" ON mydb --删除保留数据为dbbak数据 DROP SERIES from pay where tag_key='' --删除key中的tag SHOW SHARDS --查看数据存储文件 DROP SHARD 1 SHOW SHARD GROUPS SHOW SUBSCRIPTIONS 4、函数使用 mean-平均值 sum-总和 min-最小值 max-最大值 count-总个数 select * from pay order by time desc limit 2 select mean(allTime) from pay where time >= today() group by time(10m) time_zone(+8) select * from pay time_zone(+8) limit 2 SELECT sum(allTime) FROM "pay" WHERE time > now() - 10s select count(allTime) from pay where time > now() - 10m group by time(1s) 5、用户管理命令 复制代码 SHOW USERS CREATE USER jdoe WITH PASSWORD '1337password' -- Create a normal database user. CREATE USER jdoe WITH PASSWORD '1337password' WITH ALL PRIVILEGES -- Create an admin user. REVOKE ALL PRIVILEGES FROM jdoe revoke admin privileges from jdoe REVOKE READ ON mydb FROM jdoe -- revoke read privileges from jdoe on mydb SHOW GRANTS FOR jdoe -- show grants for jdoe GRANT ALL TO jdoe -- grant admin privileges GRANT READ ON mydb TO jdoe -- grant read access to a database DROP USER jdoe 复制代码 6、数据保留命令 复制代码 查看保留期 SHOW RETENTION POLICIES ON mydb 修改保留期 ALTER RETENTION POLICY default ON online DEFAULT 删除保留期 DROP RETENTION POLICY <retentionpolicy> ON <database> 创建保留期 CREATE RETENTION POLICY "rp_name" ON "db_name" DURATION 30d REPLICATION 1 DEFAULT rp_name:策略名 db_name:具体的数据库名 30d:保存30天,30天之前的数据将被删除 它具有各种时间参数,比如:h(小时),w(星期)m minutes h hours d days w weeks INF infinite REPLICATION 1:副本个数,这里填1就可以了 DEFAULT 设为默认的策略 复制代码 7、创建持续性数据处理结果 提供后续查询 复制代码 -- selects from default retention policy and writes into 6_months retention policy CREATE CONTINUOUS QUERY "10m_event_count" ON db_name BEGIN SELECT count(value) INTO "6_months".events FROM events GROUP BY time(10m) END; -- this selects from the output of one continuous query in one retention policy and outputs to another series in another retention policy CREATE CONTINUOUS QUERY "1h_event_count" ON db_name BEGIN SELECT sum(count) as count INTO "2_years".events FROM "6_months".events GROUP BY time(1h) END; -- this customizes the resample interval so the interval is queried every 10s and intervals are resampled until 2m after their start time -- when resample is used, at least one of "EVERY" or "FOR" must be used CREATE CONTINUOUS QUERY "cpu_mean" ON db_name RESAMPLE EVERY 10s FOR 2m BEGIN SELECT mean(value) INTO "cpu_mean" FROM "cpu" GROUP BY time(1m) END; DROP CONTINUOUS QUERY <cq_name> ON <database_name> --删除 SHOW CONTINUOUS QUERIES --查看连续执行命令 复制代码 8、http api 1. 普通保存 curl -i -X POST 'http://127.0.0.1:8086/write?db=online' --data-binary 'pay,host=1,merId=1234567890,orderFlag=1 allTime=347,ecifTime=39,icqTime=88' 2.Write points from a file by passing @filename to curl. cpu_data.txt内容如下: cpu_load_short,host=server02 value=0.67 cpu_load_short,host=server02,region=us-west value=0.55 1422568543702900257 cpu_load_short,direction=in,host=server01,region=us-west value=2.0 1422568543702900257 Write the data in cpu_data.txt to the mydb database with: curl -i -XPOST 'http://localhost:8086/write?db=mydb' --data-binary @cpu_data.txt 3.单查询 curl -GET 'http://localhost:8086/query?pretty=true' --data-urlencode "db=mydb" --data-urlencode "q=SELECT value FROM cpu_load_short WHERE region='us-west'" 4.多查询 curl -G 'http://localhost:8086/query?pretty=true' --data-urlencode "db=mydb" --data-urlencode "q=SELECT value FROM cpu_load_short WHERE region='us-west';SELECT count(value) FROM cpu_load_short WHERE region='us-west'" 5.格式化time epoch=[h,m,s,ms,u,ns] curl -G 'http://localhost:8086/query' --data-urlencode "db=mydb" --data-urlencode "epoch=s" --data-urlencode "q=SELECT value FROM cpu_load_short WHERE region='us-west'"
influxdb 的定时聚合