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Questions tagged [iotdb]

Apache IoTDB (Database for Internet of Things)

"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."

Source: https://iotdb.apache.org/

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How can I check data in half-hour intervals using query statements in Apache IoTDB?

How to check the data in half-hour intervals in Apache IoTDB? I want to ask if I want to check the data at half-hour time intervals in Apache IoTDB, such as I need to check data at 9am, 9:30am, 10:00am, 10:30am and so on, how should I write the…
yiihu
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How to increase the connection slots when inserting new data in Apache IoTDB?

How to increase the connection slots when inserting new data in Apache IoTDB? I would like to ask if I encounter an error like this when saving new data in Apache IoTDB: "FATAL: remaining connection slots are reserved for non-replication superuser…
yiihu
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How to fix the "connection fail" error for export-tsfile tool of Apache IoTDB?

Does anyone know if the export-tsfile tool in Apache IoTDB needs to change any configuration when it reports that it cannot connect to the server? The error message is: "connect failed because Fail to reconnect to server. Please check server…
brook
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Why Apache IoTDB failed to extend region of cluster Version 1.0.0?

Msg: 1003: ConfigNode failed to extend Region because there are not enough DataNodes I tried to expand cluster Version 1.0.0 of Apache IoTDB and the action failed with an error reported: "Msg: 1003: ConfigNode failed to extend Region because there…
bd20230523
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How to kill a stuck query process in Apache IoTDB when time series data is large?

Considering the size of the time series, how may Apache IoTDB terminate the query process? Is there a method to terminate the query process when it becomes stuck if a significant number of time series were returned from a query using Apache IoTDB?…
Chunv
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How to set timestamp of Apache IoTDB Version 1.1.0 to seconds to reduce the frequency of storage?

We are collecting time series data in seconds, but the timestamp in Apache IoTDB is a non-zero number in milliseconds. Now we want to set the timestamp stored in IoTDB directly in seconds, which remains the same with the data. I remember that…
harden
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When upgrading to Version 1.X, how to automatically switch the single quotation settings of existing data?

Previously I use Version 0.13 of Apache IoTDB, and now I want to use Version 1.X. However there are still a lot of data in the older version, and the previous time series used '' single quotation marks in names and statements. Is there any good way…
brook
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How to set not to automatically merge tsfile in Apache IoTDB?

I found that Apache IoTDB will automatically merge tsfile to control the number and size of tsfile. Since I am not sure if I can find the original data if the original tsfile is joined, I am curious that if IoTDB can set not to automatically merge…
user21515202
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How can Apache IoTDB return the amount of time series under certain root?

Does anyone know how to calculate the number of time series under certain root of Apache IoTDB? I tried to use "count" command, but the result did not come out, maybe because the amount that needs to come back is too large. How to know the amount…
user21918578
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Apache IoTDB query returning duplicate data when one field has no data

When one numeric field has no data, why do the other two fields returned duplicate data in Apache IoTDB? Currently, I use Apache IoTDB Version 1.0.0 and there are three numeric field, cc1_tag1, cc1_tag2, and cc1_tag3. When I tried to query data in…
Chunv
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What is causing 'Parse file to resource error' when loading tsfile in Apache IoTDB?

What may be why parse file to resource error when loading a tsfile in Apache IoTDB? When I tried to load tsfile in Apache IoTDB using : load '/data/henaniotdb/data/data/sequence/root.TY/0/0/1662621857867-7-0-2.tsfile' an error occurred: Msg: 701:…
Aixu
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Constant values in Apache IoTDB time series data: how to query?

How to query data in Apache IoTDB with constant in time series? There is a constant data column in my time series of Apache IoTDB. When query using, such as "select status, '1' from root.ln.wf02.* align by device", an error will be reported…
Aixu
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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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