InfluxDB 介绍
InfluxDB 是一个开源分布式时序、事件和指标数据库。使用 Go 语言编写，无需外部依赖。其设计目标是实现分布式和水平伸缩扩展。InfluxDB
包括用于存储和查询数据，在后台处理ETL或监视和警报目的，用户仪表板以及可视化和探索数据等的API。
以下是InfluxDB目前支持的一些功能，使其成为处理时间序列数据的绝佳选择：
- 专为时间序列数据编写的自定义高性能数据存储。 TSM引擎允许高摄取速度和数据压缩
- 完全用 Go 语言编写。 它编译成单个二进制文件，没有外部依赖项
- 简单，高性能的写入和查询HTTP API
- 插件支持其他数据提取协议，如Graphite，collectd和OpenTSDB
- 专为类似sql的查询语言量身定制，可轻松查询聚合数据
- 标签允许对系列进行索引以实现快速有效的查询
- 保留策略有效地自动使过时数据过期
- 连续查询自动计算聚合数据，以提高频繁查询的效率
示例代码：
//初始化
influxdb = new InfluxDB(host, port, username, password, database);
// with server set timestamps
influxdb.writePoints("some_series", [
{"value": 23.0, "state": "NY", "email": "[email protected]"},
{"value": 191.3, "state": "CO", "email": "[email protected]"}
]);
// with a specified timestamp
influxdb.writePoints("response_times", [
{time: new Date(), "value": 232}
]);
// get the latest point from the events time series
series = influxdb.query(
"select * from events limit 1;");
// get the count of events (using the column type)
// in 5 minute periods for the last 4 hours
series = influxdb.query(
"select count(region) from events " +
"group by time(5m) where time > Now() - 4h;");
// get the count of unique event types in 10 second
// intervals for the last 30 minutes
series = influxdb.query(
"select count(type) from events " +
"group by time(10s), type where time > Now() - 30m;");
// get the 90th percentile for the value column of response
// times in 1 hour increments for the last 2 days
series = influxdb.query(
"select percentile(value, 90) from response_times " +
"group by time(1h) where time > Now() - 2d;");
// get the median in 1 hour increments for the last day
series = influxdb.query(
"select median(value) from response_times " +
"group by time(1h) where time > Now() - 1d;");
// get events from new york
series = influxdb.query(
"select * from events " +
"where state = 'ny';");
// get the number of unique users in 1 hour periods
// for the last 48 hours
series = influxdb.query(
"select count(distinct(email)) from events " +
"group by time(1h) " +
"where time > Now() - 2d;");
// get the count of events in 10 minute increments
// from users with gmail addresses
series = influxdb.query(
"select count(email) from events " +
"group by time(10m) " +
"where email =~ /.*gmail\.com/;");
InfluxDB 官网
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