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Questions tagged [apache-iotdb]

Questions related to the Apache IoTDB Project (https://iotdb.apache.org/). Apache IoTDB (Database for Internet of Things) is an IoT native database with high performance for data management and analysis, deployable on the edge and the cloud.

The Project itself states (see https://iotdb.apache.org/)

Apache IoTDB (Database for Internet of Things) is an IoT native database with high performance for data management and analysis, deployable on the edge and the cloud. Due to its light-weight architecture, high performance and rich feature set together with its deep integration with Apache Hadoop, Spark and Flink, Apache IoTDB can meet the requirements of massive data storage, high-speed data ingestion and complex data analysis in the IoT industrial fields.

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How to query all time series of different devices using one query statement in Apache IoTDB?

I would like to ask, if there are 3 devices ("DEVICE001", "DEVICE002", "DEVICE003") in the same time series, is it possible to read all device data at one time in the same database query? Currently, the following database queries are used to read…
bd20230523
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How to set asynchronous loop to query data in Apache IoTDB using M4 calculation?

When using M4 calculation in Apache IoTDB, currently only can query data in one measuring point. Therefore, when I need to query multiple measuring points using M4, it is necessary to do a circular query. When there are more than 10 measuring points…
user21515202
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When resetting password of Apache IoTDB, why error reported "connection refused"?

Msg: 713: All retry failed due to: net.sf.cglib.core.CodeGenerationException: org.apache.thrift.transport.TTransportException-->java.net.ConnectException: Connection refused (Connection refused) ALTER USER root SET PASSWORD I use "ALTER USER root…
user21918578
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How to set the path of installing Apache IoTDB through command?

When I compiled source code of IoTDB, I want to set the startup path to the path I created, but seems like I cannot find this path when I install IoTDB. Is there a way to specify the path through command in Apache IoTDB? Does anyone can deal this…
guqing
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Why can't Apache IoTDB return certain number of data in descending order?

The data in Apache IoTDB Version 1.1.0 is updated in real time, and there is no problem with querying in descending order (using "order by time desc" statement). However, I find that after adding "limit 1" after "desc" in query statement, the query…
guqing
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Why did Apache IoTDB Version 1.1.0 reported "too many requests" error when writing data?

When I replaced the "lib" profile of Version 1.1.0 and write data in Apache IoTDB, an error was reported: "StatementExecutionException Create breakpoint: 606: Reject write because there are too many requests need to process". I tried to change the…
user21918578
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Why Apache IoTDB reported "Invalid method name" error after startup?

executeQueryStatement failed: org.apache.iotdb.rpc.IoTDBConnectionException: org.apache.thrift.TApplicationException: Invalid method name: 'executeQueryStatementV2'，1.0版本的 I found an error right after I start up and tried to query using Apache IoTDB…
coco
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How to check the grammar of time series name to avoid reporting "empty set" when querying in Apache IoTDB?

I used the "select * from root.jj.1#_10#.*" statement to query data in Apache IoTDB Version 1.0.0, but it reported an empty set when this time series has data in it. I checked the official website of IoTDB, and it seems like this is a problem…
user21515202
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How to prevent the queue aligned by device from being restricted in Apache IoTDB?

I use Apache IoTDB Version 1.1.0 to try to query more than 500 time series using "align by device" command, and an error appears: "org.apache.iotdb.rpc.StatementExecutionException: 305: cannot fetch schema, status is: 301, msg is: The queue is…
user21515202
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How to unify different fields of different devices into one time series in Apache IoTDB?

Can Apache IoTDB unify different fields of different devices into one time series? The data of our forecasting model comes from data of the measurement point of different devices, and the writing frequency of the devices is different. It is…
coco
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How to check the time corresponding to the maximum value of certain time period in Apache IoTDB?

select extreme(DDS09) from root,22,B78624018 where time >= 1675240584000 and time <= 1675240704000 When I use this following query statement: select extreme(DDS09) from root,22,B78624018 where time >= 1675240584000 and time <= 1675240704000 I…
brook
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How to stop the automatic data/snapshot process of Apache IoTDB?

I am currently using Version 1.0.0 of Apache IoTDB. I found that the size of the "data/snapshot" folder is much larger than that of the "data/sequence" folder. I looked the subfolders of "data/snapshot" and it looks like this is the database…
李袖旗
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How to query the aggregation value of the same measurement point data grouping by time under different devices in Apache IoTDB?

Currently the raw data I stored in Apache IoTDB is like: Time 1, Device 1. Measuring point; Time 1, Device 2. Measuring point; Time 2, Device 1. Measuring point; Time 2, Device 2. Measuring point I want to calculate the aggregated data value of…
Thoreau I
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How to set parameters with no data value in Apache IoTDB to speed up query time using sum?

I just finished setting up Apache IoTDB Version 1.0.1 and I frequently need to use "sum" command to calculate data. I am now using aligned time series, so I want to ask how should I store the parameter in one time series with no data value. Should I…
李袖旗
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Why do the query result according to descending timestamp in Apache IoTDB cannot be returned?

I stored a large amount of data in Apache IoTDB Version 1.0, and I found a problem recently. When I tried to query this massive amount data by ascending timestamp order, I got the corresponding result quickly, but when I tried to query by descending…
harden
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