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
0
votes
1 answer
what is the SCatalog structure used for in TDengine database?
Seems there is a catalog module in TDengine database ,but I don't know what is used for
typedef struct SCatalog {
uint64_t clusterId;
SHashObj *userCache; //key:user, value:SCtgUserAuth
SHashObj *dbCache; //key:dbname,…
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
what is the meta rent in TDengine database
May I know what meta rent is in TDengine database 3.0 ?
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
why I couldn't use TDinsight in TDengine database 3.0?
I upgrade TDengine from 2.0 to 3.0 ,but no data output .
Any one could help on this
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
what does taos_query_a means in TDengine database?
he asynchronous API has relatively high user requirements, so users can use it selectively according to specific application scenarios. The following are two important asynchronous APIs.
void taos_query_a(TAOS *taos, const char *sql, void (*fp)(void…
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
What is the SSchedQueue in TDengine database ？
I‘m reading code of TDengine database
but I don't understand what the SSchedQueue is used for .
and what the SSchedMsg is?
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
what is the difference between "show variables" and "show local variables" in TDengine database
I can see they are different output, but could not understand why they are distinguished.
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
TDengine database UDF demo issue
I'm using UDF function of TDengine database .
but seems output type is differnt as defined
this is the output:
Yu Chen
- 70
- 1
- 5
0
votes
0 answers
TDEngine can't be started after restarting the server
I am stuck on a problem that the TDEngine service cannot be started after I restart my server. I got an exception from the TDEngine log saying "taosd: /home/ubuntu/workroom/jenkins/3.0/TDinternal/community/source/libs/wal/src/walRead.c:135:…
0
votes
1 answer
when TDengine database would release Mac client?
when TDengine database would release Mac client?
I'm using Mac with restful but it is not good for me.
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
what is the STaosQset in TDengine database
I'm reading the code of TDengine database
Anyone could tell me what STaosQset is for?
I guess it will put all the same queues of different vnode together for improving performance
but where the above logic is?
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
Does consistent hash could have a bigger range like 0-2^64-1?
I'm reading the news about TDengine database.
I found they use the consistent hash to store their metadata of the tables .
But out of curiosity, could consistent hash be only 0 - 2^32-1 ?
I know it is just the range of a int?
Hence why no one speaks…
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
Why some of TDengine database's errors couldn't be found in taoserror.h?
Why some of TDengine database's errors couldn't be found in taoserror.h?
for example :
static int32_t handlePassword(SSqlCmd* pCmd, SStrToken* pPwd) {
const char* msg1 = "password can not be empty";
const char* msg2 = "name or password too…
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
In thingsboards, How to save timeseries data in influxdb or Tdengine?
In thingsboard, I want to save timeseries data in influxdb or Tdengine.
please help me.
huanglg
- 1
0
votes
0 answers
Does fprintf in C language belong to deserialization?
I'm reading TDengine database code,But I'm not a good coder
Since I have this question: Does fprintf function in C language belong to deserialization?
As I know, exporting human-readable data to storage is an important feature of…
Yu Chen
- 70
- 1
- 5
0
votes
1 answer
INTERVAL duration literals in TDEngine
I am not able to find duration literals used by INTERVAL keyword in TDEngine. E.g. select count(*) from mytable interval(1m); works for 1-minute intervals, but I don't know what letter should be used for 1-month interval. I would like to know all…
Michal Špondr
- 1,337
- 2
- 21
- 44