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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How to solve `value too large error` in TDengine?
I restarted TDengine database sever, and it shows an error:
failed to fstat log file:C:\TDengine\log\taosdlog.0, reason:value too large
I google the error information, but get nothing helps. What may be the problem?
superman
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Memory is keep increasing but not released in TDengine database
I use TDengine database 3.0.1.6 to insert data .(normal insert but not auto create table )
I wonder why my memory keeps increasing but not stable.
Yu Chen
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Data subscription in TDengine when node crashes
We have a 3 nodes TDengine database cluster. I created a data subscription by JDBC.
Class.forName("com.taosdata.jdbc.TSDBDriver");
String jdbcUrl = "jdbc:TAOS://127.0.0.1:6030/?user=root&password=taosdata";
Connection connection =…
JamesLiu
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Drop database in TDengine
I'm using TDengine. I created a database named iot_data.
When I tried to drop this database:
drop database iot_data;
there is an error:
DB error: Out of memory in rpc queue
I cannot tell what the reason is.
I google 'tdengine Out of memory in rpc…
JamesLiu
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what module is Red and black tree used in TDengine database
what module is Red and black tree used in TDengine database ?
I can see tsdb commit module uses RBT , anyone could let me know how RBT works ?
Yu Chen
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change the `keep` argument of TDengine
I want to change the keep argument of TDengine database. I write the sql according its documents .
ALTER DATABASE my_metrics keep 365;
Then I met an error :
Invalid database options
I think the syntax is correct. What may be the problem?
superman
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What is the HB module used for in TDengine?
What is the HB module used for in TDengine ?
when I run this script in TDengine database to insert 120000 rows of data :
//
// Created by jia.wen on 8/15/22.
//
//#include
#include
#include
#include…
Yu Chen
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how to redirect the database when doing taosdump restore
how could redirect the database when doing taosdump restore in TDengine database V2.6 ?
I want to put my data dumped out into a new database with a new configuration .
Because I want to change the "update" configuration .
how should I implement ?
Yu Chen
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transaction of TDengine database 3.0.1.5 can not finish
TDengine database 3.0.1.5, When Deleting a supertable in dual nodes, the super table is not deleted because one node's disk space is full (The "show transaction" message is "system out of space"). After add space, the transaction still cannot exit,…
Yu Chen
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C++ writing TDengine database with error occasionally
When I use below code to insert into TDengine database ,sometimes it will lose connection.
you can compile it and run to reproduce issue ,anyone could help on this ?
I use the async taos_query_a API to test the response time .:
//
// Created by…
Yu Chen
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why TDengine database call themself "cloud native"?
TDengine is a time-series database with cluster open-sourced.
but any specific feature related to cloud-native?
anyone could give me some information?
Yu Chen
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0
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If I want to change FQDN in TDengine database , how should I operate?
If I want to change FQDN in TDengine database , how should I operate ?
after I changing my fqdn in /etc/taos.cfg
I found I couldn't restart my Taosd service.
May I know why and how should I operate?
Yu Chen
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what is the relationship between Vnode and group in TDengine database？
"Vnodes on different data nodes can form a virtual node group to ensure the high availability of the system. The virtual node group is managed using RAFT protocol. "
Hence a vgroup is a group of VNodes with the same number
like vgroup2:…
Yu Chen
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0
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shall I update a value to null in TDengine database？
as below： I want to insert a row with null to achieve above .but seems not work.
create table t1 (ts timestamp,num1 int,num2 int);
insert into t1 (ts,num1,num2) values (“xxxx”,1,2) ;
insert into t1 values (“xxxxx”,1,2,NULL) ;
no matter I use update…
Yu Chen
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what is the SSTableVersion used for in TDengine database?
typedef struct SSTableVersion {
char dbFName[TSDB_DB_FNAME_LEN];
char stbName[TSDB_TABLE_NAME_LEN];
uint64_t dbId;
uint64_t suid;
int16_t sversion;
int16_t tversion;
int32_t smaVer;
} SSTableVersion;
it is used in…
Yu Chen
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