TDengine Configuration Parameter Scope Comparison

This document compares the configuration parameters of taosd (server-side) and taosc (client-side) in TDengine TSDB, clearly identifying the scope of each parameter.

Configuration Parameter Scope Comparison Table

Parameter Name	Scope	Description
Connection Related
firstEp	both	Endpoint of the first dnode in the cluster that taosd actively connects to at startup
secondEp	both	Endpoint of the second dnode in the cluster that taosd tries to connect to if the firstEp is unreachable
fqdn	taosd	The service address that taosd listens on
serverPort	both	The port that taosd listens on
compressMsgSize	both	Whether to compress RPC messages
shellActivityTimer	both	Duration in seconds for the client to send heartbeat to mnode
numOfRpcSessions	both	Maximum number of connections supported by RPC
numOfRpcThreads	both	Number of threads for receiving and sending RPC data
numOfTaskQueueThreads	both	Number of threads for processing RPC messages
rpcQueueMemoryAllowed	taosd	Maximum memory allowed for received RPC messages in dnode
resolveFQDNRetryTime	taosd	Number of retries when FQDN resolution fails
timeToGetAvailableConn	taosc	Maximum waiting time to get an available connection
maxShellConns	taosd	Maximum number of connections allowed
maxRetryWaitTime	both	Maximum timeout for reconnection, calculated from the time of retry
shareConnLimit	both	Number of requests a connection can share
readTimeout	both	Minimum timeout for a single request
useAdapter	taosc	Whether to use taosadapter, affects CSV file import
Monitoring Related
monitor	taosd	Whether to collect and report monitoring data
monitorFqdn	taosd	The FQDN of the server where the taosKeeper service is located
monitorPort	taosd	The port number listened to by the taosKeeper service
monitorInterval	taosd	The time interval for recording system parameters (CPU/memory) in the monitoring database
monitorMaxLogs	taosd	Number of cached logs pending report
monitorComp	taosd	Whether to use compression when reporting monitoring logs
monitorLogProtocol	taosd	Whether to print monitoring logs
monitorForceV2	taosd	Whether to use V2 protocol for reporting
telemetryReporting	taosd	Whether to upload telemetry
telemetryServer	taosd	Telemetry server address
telemetryPort	taosd	Telemetry server port number
telemetryInterval	taosd	Telemetry upload interval
crashReporting	both	Whether to upload crash information
enableMetrics	taosd	Whether to open write diagnostic tools, collect and upload write metrics
metricsInterval	taosd	Interval for write diagnostic tools to upload write metrics
metricsLevel	taosd	Level of write metrics uploaded by write diagnostic tools
Query Related
countAlwaysReturnValue	both	Whether count/hyperloglog functions return a value when input data is empty or NULL
tagFilterCache	taosd	Whether to cache tag filter results
queryBufferSize	taosd	Query available cache size
queryRspPolicy	taosd	Query response strategy
queryUseMemoryPool	taosd	Whether query will use memory pool to manage memory
minReservedMemorySize	taosd	The minimum reserved system available memory size
singleQueryMaxMemorySize	taosd	The memory limit that a single query can use on a single node (dnode)
filterScalarMode	taosd	Force scalar filter mode
queryNoFetchTimeoutSec	taosd	Timeout when application does not FETCH data for a long time during query
queryPlannerTrace	both	Whether the query plan outputs detailed logs
queryNodeChunkSize	both	Chunk size of the query plan
queryUseNodeAllocator	both	Allocation method of the query plan
queryMaxConcurrentTables	both	Allocation method of the query plan
queryRsmaTolerance	taosd	Allocation method of the query plan
enableQueryHb	both	Whether to send query heartbeat messages
pqSortMemThreshold	taosd	Memory threshold for sorting
keepColumnName	taosc	Automatically sets the alias to the column name when querying with Last, First, LastRow functions
multiResultFunctionStarReturnTags	taosc	Whether last()/last_row()/first(*) returns tag columns when querying a supertable
metaCacheMaxSize	taosc	Specifies the maximum size of metadata cache for a single client
maxTsmaCalcDelay	taosc	The allowable delay for tsma calculation by the client during query
tsmaDataDeleteMark	taosc	The retention time for intermediate results of historical data calculated by TSMA
queryPolicy	taosc	Execution strategy for query statements
queryTableNotExistAsEmpty	taosc	Whether to return an empty result set when the queried table does not exist
querySmaOptimize	taosc	Optimization strategy for sma index
queryMaxConcurrentTables	taosc	Concurrency number of the query plan
minSlidingTime	taosc	Minimum allowable value for sliding
minIntervalTime	taosc	Minimum allowable value for interval
compareAsStrInGreatest	taosc	Comparison type conversion rules for greatest and least functions
showFullCreateTableColumn	taosc	Whether show create table returns column compression information
Region Related
timezone	both	Time zone
locale	both	System locale information and encoding format
charset	both	Character set encoding
Storage Related
dataDir	taosd	Directory for data files, all data files are written to this directory
diskIDCheckEnabled	taosd	Whether to check if the disk id of dataDir has changed when restarting dnode
tempDir	both	Specifies the directory for generating temporary files during system operation
minimalDataDirGB	taosd	Minimum space to be reserved in the time-series data storage directory specified by dataDir
minimalTmpDirGB	both	Minimum space to be reserved in the temporary file directory specified by tempDir
minDiskFreeSize	taosd	When the available space on a disk is less than or equal to this threshold, the disk will no longer be selected
ssAutoMigrateIntervalSec	taosd	Trigger cycle for automatic upload of local data files to shared storage
ssEnabled	taosd	Whether to enable shared storage
ssAccessString	taosd	A string which contains various options for accessing the shared storage
ssPageCacheSize	taosd	Number of shared storage page cache pages
ssUploadDelaySec	taosd	How long a data file remains unchanged before being uploaded to shared storage
cacheLazyLoadThreshold	taosd	Cache loading strategy
Cluster Related
supportVnodes	taosd	Maximum number of vnodes supported by a dnode
numOfCommitThreads	taosd	Maximum number of commit threads
numOfCompactThreads	taosd	Maximum number of compact threads
numOfMnodeReadThreads	taosd	Number of Read threads for mnode
numOfVnodeQueryThreads	taosd	Number of Query threads for vnode
numOfVnodeFetchThreads	taosd	Number of Fetch threads for vnode
numOfVnodeRsmaThreads	taosd	Number of Rsma threads for vnode
numOfQnodeQueryThreads	taosd	Number of Query threads for qnode
ttlUnit	taosd	Unit for ttl parameter
ttlPushInterval	taosd	Frequency of ttl timeout checks
ttlChangeOnWrite	taosd	Whether ttl expiration time changes with table modification
ttlBatchDropNum	taosd	Number of subtables deleted in a batch for ttl
retentionSpeedLimitMB	taosd	Speed limit for data migration across different levels of disks
maxTsmaNum	taosd	Maximum number of TSMAs that can be created in the cluster
tmqMaxTopicNum	taosd	Maximum number of topics that can be established for subscription
tmqRowSize	taosd	Maximum number of records in a subscription data block
audit	taosd	Audit feature switch
auditInterval	taosd	Time interval for reporting audit data
auditCreateTable	taosd	Whether to enable audit feature for creating subtables
encryptAlgorithm	taosd	Data encryption algorithm
encryptScope	taosd	Encryption scope
encryptPassAlgorithm	taosd	Switch for saving user password as encrypted string
enableWhiteList	taosd	Switch for whitelist feature
syncLogBufferMemoryAllowed	taosd	Maximum memory allowed for sync log cache messages for a dnode
syncApplyQueueSize	taosd	Size of apply queue for sync log
syncElectInterval	taosd	Internal parameter, for debugging synchronization module
syncHeartbeatInterval	taosd	Internal parameter, for debugging synchronization module
syncHeartbeatTimeout	taosd	Internal parameter, for debugging synchronization module
syncSnapReplMaxWaitN	taosd	Internal parameter, for debugging synchronization module
arbHeartBeatIntervalSec	taosd	Internal parameter, for debugging synchronization module
arbCheckSyncIntervalSec	taosd	Internal parameter, for debugging synchronization module
arbSetAssignedTimeoutSec	taosd	Internal parameter, for debugging synchronization module
mndLogRetention	taosd	Internal parameter, for debugging mnode module
skipGrant	taosd	Internal parameter, for authorization checks
trimVDbIntervalSec	taosd	Internal parameter, for deleting expired data
ttlFlushThreshold	taosd	Internal parameter, frequency of ttl timer
compactPullupInterval	taosd	Internal parameter, frequency of data reorganization timer
walFsyncDataSizeLimit	taosd	Internal parameter, threshold for WAL to perform FSYNC
walForceRepair	taosd	Internal parameter, repair WAL file forcibly
transPullupInterval	taosd	Internal parameter, retry interval for mnode to execute transactions
forceKillTrans	taosd	Internal parameter, for debugging mnode transaction module
mqRebalanceInterval	taosd	Internal parameter, interval for consumer rebalancing
uptimeInterval	taosd	Internal parameter, for recording system uptime
timeseriesThreshold	taosd	Internal parameter, for usage statistics
udf	taosd	Whether to start UDF service
udfdResFuncs	taosd	Internal parameter, for setting UDF result sets
udfdLdLibPath	taosd	Internal parameter, indicates the library path for loading UDF
enableStrongPassword	taosd	Password requirements for strong password validation
Stream Computing Parameters
numOfMnodeStreamMgmtThreads	taosd	Number of mnode stream computing management threads
numOfStreamMgmtThreads	taosd	Number of snode stream computing management threads
numOfVnodeStreamReaderThreads	taosd	Number of vnode stream computing read threads
numOfStreamTriggerThreads	taosd	Number of stream computing trigger threads
numOfStreamRunnerThreads	taosd	Number of stream computing execution threads
streamBufferSize	taosd	Maximum cache size that stream computing can use
streamNotifyMessageSize	taosd	Controls the message size for event notifications
streamNotifyFrameSize	taosd	Controls the underlying frame size when sending event notification messages
Log Related
logDir	both	Log file directory, operational logs will be written to this directory
minimalLogDirGB	both	Stops writing logs when the available space on the disk where the log folder is located is less than this value
numOfLogLines	both	Maximum number of lines allowed in a single log file
asyncLog	both	Log writing mode
logKeepDays	both	Maximum retention time for log files
slowLogThreshold	taosd	Slow query threshold, queries taking longer than or equal to this threshold are considered slow
slowLogMaxLen	taosd	Maximum length of slow query logs
slowLogScope	taosd	Type of slow query records
slowLogExceptDb	taosd	Specifies the database that does not report slow queries
debugFlag	both	Log switch for running logs
tmrDebugFlag	both	Log switch for the timer module
uDebugFlag	both	Log switch for the utility module
rpcDebugFlag	both	Log switch for the rpc module
qDebugFlag	both	Log switch for the query module
dDebugFlag	taosd	Log switch for the dnode module
vDebugFlag	taosd	Log switch for the vnode module
mDebugFlag	taosd	Log switch for the mnode module
azDebugFlag	taosd	Log switch for the S3 module
sDebugFlag	taosd	Log switch for the sync module
tsdbDebugFlag	taosd	Log switch for the tsdb module
tqDebugFlag	taosd	Log switch for the tq module
fsDebugFlag	taosd	Log switch for the fs module
udfDebugFlag	taosd	Log switch for the udf module
smaDebugFlag	taosd	Log switch for the sma module
idxDebugFlag	taosd	Log switch for the index module
tdbDebugFlag	taosd	Log switch for the tdb module
metaDebugFlag	taosd	Log switch for the meta module
stDebugFlag	taosd	Log switch for the stream module
sndDebugFlag	taosd	Log switch for the snode module
jniDebugFlag	taosc	Log switch for the jni module
cDebugFlag	taosc	Log switch for the client module
simDebugFlag	taosc	Internal parameter, log switch for the test tool
tqClientDebugFlag	taosc	Log switch for the client module
Debugging Related
enableCoreFile	both	Whether to generate a core file when crashing
configDir	both	Directory where the configuration files are located
forceReadConfig	taosd	Whether to force reading configuration from file
scriptDir	both	Directory for internal test tool scripts
assert	both	Assertion control switch
randErrorChance	both	Internal parameter, used for random failure testing
randErrorDivisor	both	Internal parameter, used for random failure testing
randErrorScope	both	Internal parameter, used for random failure testing
safetyCheckLevel	both	Internal parameter, used for random failure testing
experimental	taosd	Internal parameter, used for some experimental features
simdEnable	both	Internal parameter, used for testing SIMD acceleration
AVX512Enable	both	Internal parameter, used for testing AVX512 acceleration
rsyncPort	taosd	Internal parameter, used for debugging stream computing
snodeAddress	taosd	Internal parameter, used for debugging stream computing
checkpointBackupDir	taosd	Internal parameter, used for restoring snode data
enableAuditDelete	taosd	Internal parameter, used for testing audit functions
slowLogThresholdTest	taosd	Internal parameter, used for testing slow logs
bypassFlag	both	Internal parameter, used for short-circuit testing
Compression Parameters
fPrecision	taosd	Sets the compression precision for float type floating numbers
dPrecision	taosd	Sets the compression precision for double type floating numbers
lossyColumn	taosd	Enables TSZ lossy compression for float and/or double types
ifAdtFse	taosd	When TSZ lossy compression is enabled, use the FSE algorithm instead of the HUFFMAN algorithm
enableIpv6	taosd	Force nodes to communicate directly via IPv6 only
maxRange	taosd	Internal parameter, used for setting lossy compression
curRange	taosd	Internal parameter, used for setting lossy compression
compressor	taosd	Internal parameter, used for setting lossy compression
Writing Related
smlChildTableName	taosc	Key for custom child table name in schemaless
smlAutoChildTableNameDelimiter	taosc	Delimiter between schemaless tags, concatenated as the child table name
smlTagName	taosc	Default tag name when schemaless tag is empty
smlTsDefaultName	taosc	Configuration for setting the time column name in schemaless auto table creation
smlDot2Underline	taosc	Converts dots in supertable names to underscores in schemaless
maxInsertBatchRows	taosc	Maximum number of rows per batch insert
SHELL Related
enableScience	taosc	Whether to enable scientific notation for displaying floating numbers
WebSocket Related
serverPort	taosc	The port that taosAdapter listens on
timezone	taosc	Time zone
logDir	taosc	Log file directory, operational logs will be written to this directory
logKeepDays	taosc	Maximum retention period for log files in days
rotationCount	taosc	Number of log file rotations before deletion
rotationSize	taosc	Maximum size of a single log file
compression	taosc	Enable WebSocket message compression
adapterList	taosc	List of taosAdapter addresses for load balancing and failover
connRetries	taosc	Maximum number of retries upon connection failure
retryBackoffMs	taosc	Initial wait time in milliseconds after connection failure
retryBackoffMaxMs	taosc	Maximum wait time in milliseconds when connection fails

Description

• taosd: Configuration parameters that only take effect on the server side
• taosc: Configuration parameters that only take effect on the client side
• both: Configuration parameters that take effect on both server and client sides