TDengine is an open-sourced big data platform under GNU AGPL v3.0, designed and optimized for the Internet of Things (IoT), Connected Cars, Industrial IoT, and IT Infrastructure and Application Monitoring.
Questions tagged [tdengine]
345 questions
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2 answers
Is a vnode in TDengine able to split?
After creating many tables in TDengine, there are a lot of vnodes in my TDengine cluster. However, I find one of the vnode is too busy. So I want to split the vnode into two. Is there a way to do that?
lsm
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2 answers
Can FQDN be replaced by IP address in TDengine?
We built a test environment with TDengine, with a 4 nodes cluster. We configured the FQDN(Fully Qualified Domain Name) according the document. It's OK.
Now we have a requirement to use IP, not FQDN. However, I didn't find the instructions through…
superman
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How to know which vnode a table is in when using TDengine?
I am use TDengine now. I know that TDengine likes Cassandra that both use virtual node as virtualization. How can I know which vnode a table is in? I tried to use describe tbname, but I got no information like below:
enter image description here
lsm
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1 answer
How to change the max length of column name in TDengine?
According to the document of TDengine,
The maximum length of a column name is 64.
I want to change it from 64 to 100 in source code, and build a new version.
Then I found taosdef.h,and changed it:
#define TSDB_COL_NAME_LEN 100
Then I built it…
superman
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TDengine Assertion happen when I query
When I fuzz the Tdengine in Linux, I got an assertion failure as following:
Welcome to the TDengine shell from Linux, Client Version:2.0.19.0
Copyright (c) 2020 by TAOS Data, Inc. All rights reserved.
taos> SELECT bool 't' AS true;
taos:…
hook capt
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How to insert data by file into TDengine database
I follow this link https://www.taosdata.com/cn/documentation/taos-sql#insert, what I have tried is the following command:
insert into TD_D019 FILE /root/TD_D019.csv
insert into TD_D01986 file '/root/TD_D01986.csv'
Unfortunately, I got the following…
Jackson
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How to install TDengine database on Mac OS
I follow the step from this link https://github.com/taosdata/TDengine to install TDengine on my mac (Big Sur 11.1). After I run make install command, I got this error message at the end:
CMake Error at cmake_install.cmake:75 (file):
file failed to…
Jackson
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0
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2 answers
TDengine renaming the result in query
In MySQL, the renamming the the fetched result can be renamed through 'c1 and c2', or 'c1 c2'. In the Documentation, it says 'c1 and c2' is supported , but nothing can be found about 'c1 c2'.
Is 'select c1 c2 from table' supported by TDengine?
Feng Bryant
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2 answers
Are TDengine database query keywords case sensitive?
After created a super table with tag name same as table name but in upper case:
taos> select *,tbname from stb001;
point_time | value_double | tab_column | tbname …
GeorgeWill93
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1 answer
How to change TDengine database default parameter
After searching TDengine online documentation: https://www.taosdata.com/en/documentation/, I found the the command to change the default database parameter "keep", which indicates how long data will be preserved in databases. However after I have…
GeorgeWill93
- 167
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0
votes
1 answer
TDengine core dump with 300+ connections
Platform OS:CentOS 7.0]
TDengine Version [e.g. 20.0.20.10]
When I use 300 more concurrent connections to connect TDengine, its core is dumped.
Pretty simple using:
TAOS *taos = taos_connect("td1", "root", "taosdata", "testdb", 6030);
(gdb) where
#0…
hook capt
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votes
1 answer
How to fetch the result using TDengine python connector
For the python connector of the TDengine database, I want to get the query result instead of knowing whether it was successfully executed or not. I just want to fetch the result, which api should I use?
I used execute before but it only returns 1…
Jackson
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1 answer
TDengine taos-JDBC no suitable driver found
I used the taos-jdbc to connect with the TDengine. I tried the example provided by taosdata on github https://github.com/taosdata/TDengine/blob/develop/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBParameterMetaDataTest.java. And I met the…
Ray Shown
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1 answer
Get full text shown in TDengine database query result
I want to see the create database sql and I use show create database test command. But the result is
I want to see the whole information about Create Database column, what should I do?
Jackson
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1 answer
query space of TDengine Cluster
I have built a tdengine cluster with three nodes. And want to the space that the cluster used. Are there any commands or sqls that can help me check how much space I have used? Just like hdfs using a command like
hadoop fs -du -h…
Ray Shown
- 33
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