04-influxdb基本操作

influxdb基本操作

1. 数据库基本操作

# 创建数据库
> create database db01;

# 查看数据库
> show databases;
name: databases
name
----
_internal
mydb
db01

# 删除数据库
> drop database db01;
> show databases;
name: databases
name
----
_internal
mydb

# 使用数据库
> use mydb;
Using database mydb

2. 表基本操作（measurement）

# 查看表
> show measurements;
name: measurements
name
----
meas01
meas02
mymeans
mymeas

# 新建表
# disk_free 就是表名，hostname是索引，value=xx是记录值，记录值可以有多个，最后是指定的时间
> insert disk_free,hostname=server01 value=442221834240i 1435362189575692182
> show measurements;

name: measurements
name
----
disk_free
meas01
meas02
mymeans
mymeas

# 查看表
> select * from disk_free;
name: disk_free
time                hostname value
----                -------- -----
1435362189575692182 server01 442221834240

# 删除表
> drop measurement disk_free;
> show measurements;
name: measurements
name
----
meas01
meas02
mymeans
mymeas

3. 系列基本操作（series）

> select * from disk_free;
name: disk_free
time                hostname value
----                -------- -----
1435362189335692182 server01 442221834240
1435362189345692182 server01 442221834240
1435362189355692182 server01 442221834240
1435362189355692182 server02 442221834240

# series表示这个表里面的数据，可以在图表上画成几条线，series主要通过tags排列组合算出来。
> show series from disk_free;
key
---
disk_free,hostname=server01
disk_free,hostname=server02

4.  存储策略操作（rentention policy）

# 注意：策略名称需要添加引号
# 新建策略
> create retention policy "role-02" on "mydb" duration 2h replication 1 default

# 查看策略
> show retention policies on mydb;
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        false
2_hours 2h0m0s   1h0m0s             1        false
role-01 2h0m0s   1h0m0s             1        false
role-02 2h0m0s   1h0m0s             1        true

# name--名称，此示例名称为 default
# duration--持续时间，0代表无限制1h, 90m, 12h, 7d, 4w, INF 最小1h, 最大INF
# shardGroupDuration--shardGroup的存储时间，shardGroup是InfluxDB的一个基本储存结构，应该大于这个时间的数据在查询效率上应该有所降低。
# replicaN--全称是REPLICATION，副本个数
# default--是否是默认策略

# 修改策略
> alter retention policy "role-01" on mydb duration 3h default
> show retention policies on mydb;
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        false
2_hours 2h0m0s   1h0m0s             1        false
role-01 3h0m0s   1h0m0s             1        true
role-02 2h0m0s   1h0m0s             1        false

# 删除策略
> drop retention policy "role-01" on mydb;
> show retention policies on mydb;
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        false
2_hours 2h0m0s   1h0m0s             1        false
role-02 2h0m0s   1h0m0s             1        false

5. 用户操作

# 查看用户
> show users;
user  admin
----  -----
admin true

# 创建普通用户
> create user root with password '123456';
> show users;
user  admin
----  -----
admin true
root  false

# 创建具有admin权限的用户
> create user root with password '111111' with all privileges;
> show users;
user  admin
----  -----
admin true
root  true

# 授权root用户admin权限
> grant all privileges to root;
> show users;
user  admin
----  -----
admin true
root  true

# 删除用户
> drop user root;
> show users;
user  admin
----  -----
admin true

# 修改用户密码
> set password for admin='111111';