Taosi TDengine 2.6+ optimization parameters

taosBenchmark -I stmt -n 200000 -t 100000time dd if=/dev/vdb of=/dev/null bs=4kiostat -d -k 1 100000

Query related:

parameters	Meaning	Default value
queryBufferSize	Amount of memory reserved for all concurrent query usage.Unit M	No default value
ratioOfQueryCores	Sets the maximum number of query threads.	The default value is 1, the default number of query threads is the same as the number of CPUs
ratioOfQueryThreads	Set the maximum number of query threads	1: Indicates the maximum number of query threads equal to the number of CPU cores
compressColData	Query result compression transmission threshold, in bytes	-1, no compression

Storage related:

parameters	Meaning	Default value
cache	The size of the memory block, in M	16M
blocks	How many cache-sized memory blocks are in each vnode (tsdb)	6
maxRows	Maximum number of records in file block	4096
maxVgroupsPerDb	Each Database can create a fixed number of vgroups, the default is the same as the number of CPU cores

Write related:

parameters	Meaning	Default value
numOfCommitThreads	Set the maximum number of write threads	none

Stores the INT type, which is faster than storing the Double type.Adjusted to int, indicator single table=9716 seconds, multi-table=

Stock index calculation, storage performance comparison
A. Computing server 32 cores (vCPU) 32 GiB

Project	Data level	Number of table columns	taos service 1	Performance Metrics	taos service 2	Performance Metrics
Day K write, including read source data file	12 million	17	4 cores (vCPU) 16 GiB, PL0 200GiB (4200 IOPS)	700 seconds	32 cores (vCPU) 32 GiB, 200GiB (11800 IOPS)	331 seconds
Indicators Write	12 million	94 columns, split into 8 tables		1754 seconds, 200IPOS		1629 seconds

B, computing server 4 cores (vCPU) 8GiB

Project	Data level	Number of table columns	taos service 1	Performance Metrics	taos service 2	Performance Metrics
Day K write, including read source data file	12 million	17	4 cores (vCPU) 16 GiB, PL0 200GiB (4200 IOPS)	737 seconds	32 cores (vCPU) 32 GiB, 200GiB (11800 IOPS)
Indicators Write	12 million	94 columns, split into 8 tables	5370 seconds
Indicators Write	12 million	94 columns, one table	11335 seconds

Server1

Server2

Compute Server