Stack Overflow
Stack Overflow

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/

181 questions
0
votes
1 answer

How can I query out six-digit decimals full data in Apache IoTDB?

When I query data using Apache IoTDB, it seems like by only two-digit decimals of data are queried out by default. The original data is in six-digit decimals. Anyone know how can I reset the default settings and query and retrieve the stored full…
aleina.48
  • 3
  • 1
0
votes
1 answer

How should Apache IoTDB both merge and page data values of different time periods in multiple devices?

I am still a newbie to Apache IoTDB and I have a question when reading the official user guide --- Can Apache IoTDB generate merging and paging the data result of different time periods from multiple physical quantities of multiple devices? In the…
Johnston Guan
  • 1
  • 2
0
votes
1 answer

How should Apache IoTDB be started after changing the IP number setting of data node properties?

I have a question to ask about Apache IoTDB: I changed the 127.0.0.1 in iotdb-datanode.properties to my actual ip. However, when I tried to start IoTDB, an error occured. I checked the log of IoTDB, and the log prompts that "cannot register datanode…
Miao Ge
  • 1
  • 2
0
votes
1 answer

How to query data values align by device with certain number of equipment result be removed using Apache IoTDB?

According to the query result align by device, can the query results of some devices be removed according to certain condition in Apache IoTDB? For example, I only want to query the data of fans 1-20 from hundreds of fans in total, and I cannot…
Haolong Mu
  • 1
  • 2
0
votes
1 answer

How to query latest value of large amount of devices that are all aligned in Apache IoTDB?

IoTDB> select last * from root.station01.cell.bms01.bunch01.** limit 10 align by device; Msg: 701: Last query doesn't support align by device. I tried this statement in Apache IoTDB: select last * from root.station01.cell.bms01.bunch01.** limit…
Alex Zhou
  • 1
  • 3
0
votes
1 answer

How can Apache IoTDB query measurement point value without spelling out all layers of equipment name?

If Apache IoTDB wants to query the data value of one measuring point, the name of each layer of equipment must be spelled in the query statement (for example root.vehicle.electric.speed.sensor1). I wonder if there is a way to simplify this query…
Fanshu Ma
  • 1
  • 2
0
votes
1 answer

How should Apache IoTDB query latest values when inserting multiple fields?

I currently use Version 1.0 of Apache IoTDB. After inserting 40 fields in IoTDB, why can only 3 fields be queried each time? I want to check the latest value of these fields, but all fields can only be queried without adding "last". Should I use a…
Ava Kim
  • 1
  • 2
0
votes
1 answer

When are "deleted" tsfiles droppen in IoTDB?

when I delete a timeseries in IoTDB (0.13.0) with DELETE TIMESERIES xxx I cant query it anymore but I realized that the tsfiles are still stored and also a call to MERGE or FLUSH didnt clean them up. So my question is, when are these tsfiles cleaned…
Julian
  • 438
  • 3
  • 13
0
votes
1 answer

Why not using a HashMap to get the exact enum instead of compare it one by one?

When I was reading the source code of IoTDB, I found that maybe we can add a HashMap in lots of enum class like TSEncoding to imrpove the time complexity of looking up from O(n) to O(1), like: private static final Map map = new…
Yuan Tian
  • 98
  • 1
  • 4
0
votes
1 answer

How to handle "Current system mode is read-only" when using IoTDB?

When I inserted data to Apache IoTDB, the server log show that "Current system mode is read-only". And I found no data was inserted successfully, how to handle this?
Xiangwei Wei
  • 27
  • 5
0
votes
1 answer

Too big tsfile / datastore in Apache IoTDB database (version 0.11.2)

We are using Apache IoTDB Server in Version 0.11.2 in a scenario and observe a data directory / tsfiles that are way bigger than they should be (about 130 sensors with 4 Million double values for each sensor but the files are about 200gb). Are there…
Julian
  • 438
  • 3
  • 13
-1
votes
0 answers

How to preserve data when replacing data and wal directories when upgrading to active-active mode of Apache IoTDB?

Can I directly replace the data and wal directories and still obtain my original datasets when I upgraded my standalone version of Apache IoTDB to active-active mode? If not, how can I retain my data when updated to active-active mode? I originally…
user22177617
  • 3
  • 1
-1
votes
1 answer

How to get query result when using "floating-point type parameter equals to certain number" in Apache IoTDB?

How to get query result when using "floating-point type parameter equals to certain number" in Apache IoTDB? When I query data in Apache IoTDB, I realized that if the parameter is a floating-point type, when using "where parameter = XX" statement,…
Pan Weicheng
  • 3
  • 1
-1
votes
1 answer

How to change the password of one datanode in cluster version of Apache IoTDB?

Is it not possible to change the password in the Cluster Version 1.0 of Apache IoTDB? I checked the official guide and other information, and it seems like I cannot only change password of one DataNode. Wonder if I can, and how I can change the…
CC Deng
  • 1
-1
votes
1 answer

Why the .mods files cannot be loaded when updating to Apache IoTDB Version 1.0?

Having problem synchronizing some ".mods" files. I have updated to Apache IoTDB Version 1.0, and other files in previous IoTDB version can be loaded into Version 1.0, but the three ".mods" files cannot be synchronized. However, some other ".mods"…
Jackie Du
  • 5
  • 1
1 2 3
…
11
12