Influxdb show series cardinality High series cardinality is a primary driver of high memory usage for many database workloads. However, when using the influxdb. Note: SHOW MEASUREMENTS cannot be filtered by time. 3、将series key的正排索引下沉到shard级别. 背景描述 某个看granfana上k8s监控数据时，发现其中一个月的数据异常丢失，经过一系列排查后发现，influxdb数据库系数达到最高限制，新数据无法写入数据库 将数据库系数调整成无限制后，引发了新的问题，内存瞬间被influxdb吃光，触发内存oom，influxdb内存使用率高达99% 2. influxql, flux, cardinality. More info/ background: “Series cardinality is the number of unique database, measurement, tag set, and field key combinations in an InfluxDB instance. When we released QuestDB version 6. 7. Use the following to measure series cardinality of your buckets: influxdb. csv Mar 15, 2023 · We built InfluxDB, powered by IOx as a columnar datastore, using a variety of open source tools (Apache Arrow, Apache Parquet, and more) to design a database that can ingest high volume, high cardinality time series data without impacting performance. . Fair warning, this could be a fairly heavy query depending on your data. SHOW CARDINALITY. 6 series. cardinality() function depends on an API that hasn’t been added to InfluxDB 2. 7 01c8dd4) Update - 1. show cardinality. High series cardinality is a primary driver of high memory usage for many database workloads. 2. In the mean time, you can use a query similar to the following to return the total series cardinality within a time range. cardinality反应了series的维度，即不同的series的数量： 查询series的维度 # influx -execute 'show series cardinality on opsultra' 将series的维度导出到csv: 按measurement进行cardinality进行统计 # influx -execute 'show series exact cardinality on opsultra' -format 'csv' > /tmp/series. series cardinality. influxdb. 0 yet. 6: 4005: October 22, 2021 Max-series-per-database VS show series cardinality VS . Mar 17, 2020 · > --- show series from machine unit42 > SHOW SERIES FROM temperature WHERE machine = 'unit42' key---temperature,machine=unit42, type =assembly > -- show estimated cardinality of the series on current database > SHOW SERIES CARDINALITY-- show estimated cardinality of the series on specified database > SHOW SERIES CARDINALITY ON mydb cardinality Apr 14, 2017 · We have 1million unique series at the moment running on a dedicated server: 128GB RAM, SSD, E5-1650 v3 @ 3. > SHOW FIELD KEY CARDINALITY Update - 2. InfluxDB 3 Core is a high-speed, recent-data Jan 2, 2006 · Note: EXPLAIN ANALYZE ignores query output, so the cost of serialization to JSON or CSV is not accounted for. 0, we included benchmark results that tested the performance of our new ingestion subsystem, but we didn't touch on the subject of cardinality at all. 6 (git: 1. SHOW SERIES CARDINALITY: InfluxQL command that returns the High cardinality can result in performance issues at scale due to how some time series databases index data. InfluxDB 3 Core is a high-speed, recent-data 不要有太多的series. Shows the amount of time the query took to execute, including reading the time series data, performing operations as data flows through iterators, and draining processed data from iterators. Copy logo as SVG Copy brandmark as SVG Oct 20, 2022 · I have read the Data Layout and Schema Design Best Practices for InfluxDB (Data Layout and Schema Design Best Practices for InfluxDB | InfluxData) blog post and I am now considering how I should setup my database. The single measurement has two tag keys: email and status. Although this function is similar to InfluxQL’s SHOW SERIES CARDINALITY, it works in a slightly different manner. For example, assume that an InfluxDB instance has a single database and one measurement. Q: I’ve started reading about InfluxDB schemas and series cardinality. Is series cardinality for a single measurement really just the product of the number of tag values per tag? For example, I have a single measurement with the tag keys firstname, lastname, and email. influxdb 里面每个 shard 都是有时间区间的，某个时间区间内的时间线数据并不大。比如 database 里面保存的是 180天 的 series key，而 shard 一般只有一天甚至 1 个小时的跨度，两者存放的 series key 存在 1~ 2 个数量级的差距。另外 Oct 13, 2022 · Based on the definition, I was expecting this bucket to have series cardinality of 4 (1 measurement * 2 unique-tag-values * 2 field-keys), and there are four series visibly (assuming each series has only one field). Oct 26, 2023 · 文章浏览阅读5. With the release of InfluxDB’s column-based storage engine, InfluxDB can handle time series data and workloads that contain unbounded cardinality. show cardinality 指的是用于估计或精确计数指标、序列、标签键、标签键值和字段键基数的命令组。 有关 show cardinality 命令的更多信息，请参阅influxql 参考条目。 show field key cardinality Jun 30, 2020 · 1. 1k次，点赞4次，收藏8次。本文深入探讨了InfluxDB的序列基数（SERIES CARDINALITY）及其对内存消耗的影响，分析了内存和磁盘上的倒排索引结构，详细介绍了内存管理及Go运行时的内存释放机制，并提供了性能优化方案，包括调整配置和使用GODEBUG=madvdontneed=1选项。 Oct 14, 2021 · 2. cardinality() function, I get the series cardinality as 2 (1 measurement * 2 unique-tags). 指用于估计或精确计算measurement、series、tag key、tag value和field key的基数的一组命令。 SHOW CARDINALITY命令有两种可用的版本：估计和精确。 Dec 15, 2016 · Understanding dependent tags in series cardinality. Specify a shard duration on a new database or alter an existing shard duration. Dec 13, 2024 · Discover the benefits and challenges of high-cardinality data and learn how modern databases can help you manage large-scale time-series and real-time analytics datasets. SHOW SERIES CARDINALITY How can I see the series cardinality of a single measurement? Or even better, all the measurements in a database with their respective cardinalities, as a list? I am using InfluxDB 1. 50GHz 12 threads Soon we plan to have 4 million series and going to upgrade to 256GB RAM with same CPU. For more information, check out: Beta announcement blog from Paul Dix; Get Started with InfluxDB 3 Core; Get Started with InfluxDB 3 Enterprise SHOW CARDINALITY. To specify a 1h shard duration when creating a new database Apr 23, 2021 · @0liver The influxdb. execution_time. Cardinality in InfluxDB Cloud powered by IOx. series是influxdb种共享tag集合，measurement,存储策略的数据集合。 series cardinality是一个数据库中唯一series的统计。 举个例子： 你运行了一个web 程序，使用influxdb作为中心数据库用来记录响应时间(当然可能还有一些其他指标)。 A free tier of InfluxDB 3 Enterprise will also be available for at-home, non-commercial use for hobbyists to get the full historical time series database set of capabilities. Example filtering SHOW TAG KEYS by time. To filter other meta data, replace SHOW TAG KEYS with SHOW TAG VALUES, SHOW SERIES, SHOW FIELD KEYS, and so on. I've rebuilt the indexes, but the cardinality is still high. When you write to InfluxDB, InfluxDB uses the measurements and tags that you use to create indexes to speed up Nov 11, 2020 · SHOW SERIES CARDINALITY. In InfluxDB, 四. cardinality(): Flux function that returns the number of unique series keys in your data. SHOW FIELD KEY CARDINALITY. SHOW SERIES CARDINALITY: InfluxQL command that returns the Nov 1, 2022 · With InfluxQL, the following query shows you the overall series cardinality of the database. InfluxDB 2. 是用于估计或精确计算measurement、序列、tag key、tag value和field key的基数的一组命令。 The WHERE clause in SHOW SERIES supports tag comparisons but not field comparisons. Share your setup here, I am curious what others are doing. According to the blog post “Series cardinality is the number of unique bucket, measurements, tag sets, and field keys combinations in an organization”. influxdb数据库优化 influxdb Aug 13, 2019 · influxdb性能调优. 0. Instead of storing each series in a column, the IOx engine stores each tag and field as a column. On checking field cardinality, I observed a spike in RAM. cardinality() is time bounded and reports the cardinality of data that matches the conditions passed into it rather than that of the bucket as a whole. Oct 1, 2020 · People find out that they have a cardinality problem in one of two ways: They hit cardinality limits on InfluxDB Cloud. The WHERE clause in SHOW SERIES supports tag comparisons but not field comparisons. There is this example Apr 7, 2022 · High series cardinality is a primary driver of high memory usage for many database workloads. SHOW SERIES CARDINALITY: InfluxQL command that returns the Sep 17, 2021 · 查询series cardinality. This effectively eliminates the 时序数据库 InfluxDB 是一款专门处理高写入和查询负载的时序数据库，基于 InfluxDB 能够快速构建具有海量时序数据处理能力的分析和监控软件。 该项目的发起者是 influxdata 公司，该公司提供了一套用于处理时序数据的完整解决方案，InfluxDB 是该解决方案中的核心 Oct 9, 2019 · InfluxDB version: InfluxDB v1. Update - 3 Jun 16, 2021 · Exploring high-cardinality in a time series database benchmark. They notice that reads and sometimes writes are getting slower and slower on InfluxDB Cloud or InfluxDB OSS 2. Measure series cardinality. tags包含高度可变的信息，如UUID，哈希值和随机字符串，这将导致数据库中的大量measurement，通俗地说是高series cardinality。series cardinality高是许多数据库高内存使用的主要原因。 请参阅硬件指南中基于你的硬件的series cardinality的建议。如果系统 May 10, 2017 · 'SHOW SERIES CARDINALITY' in InfluxDB v2. Hopefully it will work without any problems. fcrshb jhbjmg paqyrnr kcdr dowxvx ndqv wpbx iajjao aezk kbhlp oxacr woalexxc hng hndztjni nietwyg