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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 to delete single measuring point structure and the historical data in Apache IoTDB?

Can the data and structure of a measuring point be deleted separately from Apache IoTDB? The original datatype of this measurement point is int32, and I want to change it to double, so I want to delete this measuring point and the historical data. I…
NKZ
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How to use API to calculate the data traffic when using Apache IoTDB?

I want to know the amount of flowing data in my IoT data platform to see if I can improve the efficiency of the system. Does Apache IoTDB have an api that can count and report the data traffic, that is, the data amount that is transporting in the…
user22177617
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How to change the expiration time of the data stored in Apache IoTDB?

I already know that expired time can be set for the data stored in Apache IoTDB, so I want to know if I can change the expiration time of the data, and how to change it? Can this new expiration time be set to the data of any nodes?
Hester Tso
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How to display the non-existing value fields in the queried result of Apache IoTDB?

When I tried to use SQL to query the non-existing fields in time series of Apache IoTDB, why these fields are not displayed in the columns of the result sets? How can I set these non-existing fields to be displayed in the result queried and make its…
zai
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What nodes will the data written into the default database of Apache IoTDB?

I have already created an Apache IoTDB database on server. I want to know if I directly write data into IoTDB without creating another database, will the data automatically be written into the first two nodes created in the default database? Any…
zlyf
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For end-cloud collaboration scenario in Apache IoTDB, how to check and change the flush frequency?

I realized that Apache IoTDB can execute in end-cloud collaboration scenario, but I wonder how often will flush be executed by default in this scenario? Also, are there a parameter to modify the default flush and synchronization frequency, and how…
Monster Zhang
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How to connect the log of data synchronization when pipeline execution is normal in Apache IoTDB?

When I tried to do data synchronization on Apache IoTDB, my pipeline execution is in normal state, but the log of data synchronization cannot be connected, anyone know what may be the reason? I checked if this node is already added to the whitelist,…
Thoreau I
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How to reset the login password of Apache IoTDB?

I forgot the login password for Apache IoTDB and I cannot startup IoTDB normally. I want to know how to reset this password without starting IoTDB?
shuww
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How to restore the files in wal and execute flush when restarting fails in Apache IoTDB Version 0.13.0?

What should I do if the flush command fails to persist the files in wal, resulting in the failure to restart Apache IoTDB? I use Version 0.13.0 of IoTDB, and the error message is: 231 - WAL detected, please stop insertion and run 'SET SYSTEM TO…
Monster Zhang
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How should I query time series by using tags in Apache IoTDB Version 1.1.0?

I am reading through user guide of Apache IoTDB Version 1.1.0, and I have a question on querying using this version. I wonder if I can use tags on different time series to do querying? If I can query by using tags, how should I write my query…
NKZ
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How to solve "fetch schema failed" problem in Apache IoTDB Version 1.0.1?

Has anyone encountered this problem? I can't query out the data I need in Apache IoTDB, and error reported: executeStatement failed. Fetch Schema failed. My IoTDB version is 1.0.1. What should I do now to return to normal operating status?
zai
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After adding nodes in Apache IoTDB, why reported port number error?

I reported this error when I tried to start the second CofigNode and DataNode in the cluster of Apache IoTDB: Parameter cn_internal_port can not be 10711, please set to: 10710. Because cn_internal_port can't be modified after first startup.…
Sihan Liu
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After successfully inserted data in Apache IoTDB Version 1.1.0, why the cluster reported 507 type error?

The cluster of Apache IoTDB reported a 507 error: o.a.i.d.m.s.SchemaRegionMemoeyImpl:1148-Failed to read tag and attribute info because null. After I successfully inserted three time series using the java interface, this error is prompted. Currently…
user22177617
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How to deal with the error caused by using mqtt and aligned time series for Version 0.13.3 of Apache IoTDB?

When I use the mqtt protocol to send commands from the client of Apache IoTDB Version 0.13.3, and the time series of the server is aligned, then an error is reported: Caused by: org.apache.iotdb.db.exception.metadata.AlignedTimeseriesException:…
Hester Tso
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How to avoid automatic data type transfer from int type to float type when inserting data to Apache IoTDB?

I have a question on Apache IoTDB. When inserting data in java, for example using insertRecord method, and when the data type is int, if I tried to insert these data to IoTDB, the data type will automatically become float type. Is there any way to…
NKZ
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