# InfluxDBv3CoreParameters


All the customer-modifiable InfluxDB v3 Core parameters in Timestream for InfluxDB.

## Contents


 ** dataFusionConfig **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionConfig"></a>
Provides custom configuration to DataFusion as a comma-separated list of key:value pairs.  
Type: String  
Pattern: `[a-zA-Z0-9_]+=[^,\s]+(?:,[a-zA-Z0-9_]+=[^,\s]+)*`   
Required: No

 ** dataFusionMaxParquetFanout **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionMaxParquetFanout"></a>
When multiple parquet files are required in a sorted way (deduplication for example), specifies the maximum fanout.  
Default: 1000  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 1000000.  
Required: No

 ** dataFusionNumThreads **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionNumThreads"></a>
Sets the maximum number of DataFusion runtime threads to use.  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 2048.  
Required: No

 ** dataFusionRuntimeDisableLifoSlot **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionRuntimeDisableLifoSlot"></a>
Disables the LIFO slot of the DataFusion runtime.  
Type: Boolean  
Required: No

 ** dataFusionRuntimeEventInterval **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionRuntimeEventInterval"></a>
Sets the number of scheduler ticks after which the scheduler of the DataFusion tokio runtime polls for external events–for example: timers, I/O.  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 128.  
Required: No

 ** dataFusionRuntimeGlobalQueueInterval **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionRuntimeGlobalQueueInterval"></a>
Sets the number of scheduler ticks after which the scheduler of the DataFusion runtime polls the global task queue.  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 128.  
Required: No

 ** dataFusionRuntimeMaxBlockingThreads **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionRuntimeMaxBlockingThreads"></a>
Specifies the limit for additional threads spawned by the DataFusion runtime.  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 1024.  
Required: No

 ** dataFusionRuntimeMaxIoEventsPerTick **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionRuntimeMaxIoEventsPerTick"></a>
Configures the maximum number of events processed per tick by the tokio DataFusion runtime.  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 4096.  
Required: No

 ** dataFusionRuntimeThreadKeepAlive **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionRuntimeThreadKeepAlive"></a>
Sets a custom timeout for a thread in the blocking pool of the tokio DataFusion runtime.  
Type: [Duration](API_Duration.md) object  
Required: No

 ** dataFusionRuntimeThreadPriority **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionRuntimeThreadPriority"></a>
Sets the thread priority for tokio DataFusion runtime workers.  
Default: 10  
Type: Integer  
Valid Range: Minimum value of -20. Maximum value of 19.  
Required: No

 ** dataFusionRuntimeType **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionRuntimeType"></a>
Specifies the DataFusion tokio runtime type.  
Default: multi-thread  
Type: String  
Valid Values: `multi-thread | multi-thread-alt`   
Required: No

 ** dataFusionUseCachedParquetLoader **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-dataFusionUseCachedParquetLoader"></a>
Uses a cached parquet loader when reading parquet files from the object store.  
Type: Boolean  
Required: No

 ** deleteGracePeriod **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-deleteGracePeriod"></a>
Specifies the grace period before permanently deleting data.  
Default: 24h  
Type: [Duration](API_Duration.md) object  
Required: No

 ** disableParquetMemCache **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-disableParquetMemCache"></a>
Disables the in-memory Parquet cache. By default, the cache is enabled.  
Type: Boolean  
Required: No

 ** distinctCacheEvictionInterval **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-distinctCacheEvictionInterval"></a>
Specifies the interval to evict expired entries from the distinct value cache, expressed as a human-readable duration–for example: 20s, 1m, 1h.  
Default: 10s  
Type: [Duration](API_Duration.md) object  
Required: No

 ** execMemPoolBytes **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-execMemPoolBytes"></a>
Specifies the size of memory pool used during query execution. Can be given as absolute value in bytes or as a percentage of the total available memory–for example: 8000000000 or 10%.  
Default: 20%  
Type: [PercentOrAbsoluteLong](API_PercentOrAbsoluteLong.md) object  
 **Note: **This object is a Union. Only one member of this object can be specified or returned.  
Required: No

 ** forceSnapshotMemThreshold **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-forceSnapshotMemThreshold"></a>
Specifies the threshold for the internal memory buffer. Supports either a percentage (portion of available memory) or absolute value in MB–for example: 70% or 100  
Default: 70%  
Type: [PercentOrAbsoluteLong](API_PercentOrAbsoluteLong.md) object  
 **Note: **This object is a Union. Only one member of this object can be specified or returned.  
Required: No

 ** gen1Duration **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-gen1Duration"></a>
Specifies the duration that Parquet files are arranged into. Data timestamps land each row into a file of this duration. Supported durations are 1m, 5m, and 10m. These files are known as “generation 1” files that the compactor in InfluxDB 3 Enterprise can merge into larger generations.  
Default: 10m  
Type: [Duration](API_Duration.md) object  
Required: No

 ** gen1LookbackDuration **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-gen1LookbackDuration"></a>
Specifies how far back to look when creating generation 1 Parquet files.  
Default: 24h  
Type: [Duration](API_Duration.md) object  
Required: No

 ** hardDeleteDefaultDuration **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-hardDeleteDefaultDuration"></a>
Sets the default duration for hard deletion of data.  
Default: 90d  
Type: [Duration](API_Duration.md) object  
Required: No

 ** lastCacheEvictionInterval **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-lastCacheEvictionInterval"></a>
Specifies the interval to evict expired entries from the Last-N-Value cache, expressed as a human-readable duration–for example: 20s, 1m, 1h.  
Default: 10s  
Type: [Duration](API_Duration.md) object  
Required: No

 ** logFilter **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-logFilter"></a>
Sets the filter directive for logs.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 1024.  
Required: No

 ** logFormat **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-logFormat"></a>
Defines the message format for logs.  
Default: full  
Type: String  
Valid Values: `full`   
Required: No

 ** maxHttpRequestSize **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-maxHttpRequestSize"></a>
Specifies the maximum size of HTTP requests.  
Default: 10485760  
Type: Long  
Valid Range: Minimum value of 1024. Maximum value of 16777216.  
Required: No

 ** parquetMemCachePruneInterval **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-parquetMemCachePruneInterval"></a>
Sets the interval to check if the in-memory Parquet cache needs to be pruned.  
Default: 1s  
Type: [Duration](API_Duration.md) object  
Required: No

 ** parquetMemCachePrunePercentage **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-parquetMemCachePrunePercentage"></a>
Specifies the percentage of entries to prune during a prune operation on the in-memory Parquet cache.  
Default: 0.1  
Type: Float  
Valid Range: Minimum value of 0. Maximum value of 1.  
Required: No

 ** parquetMemCacheQueryPathDuration **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-parquetMemCacheQueryPathDuration"></a>
Specifies the time window for caching recent Parquet files in memory.  
Default: 5h  
Type: [Duration](API_Duration.md) object  
Required: No

 ** parquetMemCacheSize **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-parquetMemCacheSize"></a>
Specifies the size of the in-memory Parquet cache in megabytes or percentage of total available memory.  
Default: 20%  
Type: [PercentOrAbsoluteLong](API_PercentOrAbsoluteLong.md) object  
 **Note: **This object is a Union. Only one member of this object can be specified or returned.  
Required: No

 ** preemptiveCacheAge **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-preemptiveCacheAge"></a>
Specifies the interval to prefetch into the Parquet cache during compaction.  
Default: 3d  
Type: [Duration](API_Duration.md) object  
Required: No

 ** queryFileLimit **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-queryFileLimit"></a>
Limits the number of Parquet files a query can access. If a query attempts to read more than this limit, InfluxDB 3 returns an error.  
Default: 432  
Type: Integer  
Valid Range: Minimum value of 0. Maximum value of 1024.  
Required: No

 ** queryLogSize **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-queryLogSize"></a>
Defines the size of the query log. Up to this many queries remain in the log before older queries are evicted to make room for new ones.  
Default: 1000  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 10000.  
Required: No

 ** retentionCheckInterval **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-retentionCheckInterval"></a>
The interval at which retention policies are checked and enforced. Enter as a human-readable time–for example: 30m or 1h.  
Default: 30m  
Type: [Duration](API_Duration.md) object  
Required: No

 ** snapshottedWalFilesToKeep **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-snapshottedWalFilesToKeep"></a>
Specifies the number of snapshotted WAL files to retain in the object store. Flushing the WAL files does not clear the WAL files immediately; they are deleted when the number of snapshotted WAL files exceeds this number.  
Default: 300  
Type: Integer  
Valid Range: Minimum value of 0. Maximum value of 10000.  
Required: No

 ** tableIndexCacheConcurrencyLimit **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-tableIndexCacheConcurrencyLimit"></a>
Limits the concurrency level for table index cache operations.  
Default: 8  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 100.  
Required: No

 ** tableIndexCacheMaxEntries **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-tableIndexCacheMaxEntries"></a>
Specifies the maximum number of entries in the table index cache.  
Default: 1000  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 1000.  
Required: No

 ** walMaxWriteBufferSize **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-walMaxWriteBufferSize"></a>
Specifies the maximum number of write requests that can be buffered before a flush must be executed and succeed.  
Default: 100000  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 1000000.  
Required: No

 ** walReplayConcurrencyLimit **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-walReplayConcurrencyLimit"></a>
Concurrency limit during WAL replay. Setting this number too high can lead to OOM. The default is dynamically determined.  
Default: max(num\$1cpus, 10)  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 100.  
Required: No

 ** walReplayFailOnError **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-walReplayFailOnError"></a>
Determines whether WAL replay should fail when encountering errors.  
Default: false  
Type: Boolean  
Required: No

 ** walSnapshotSize **   <a name="tsinfluxdb-Type-InfluxDBv3CoreParameters-walSnapshotSize"></a>
Defines the number of WAL files to attempt to remove in a snapshot. This, multiplied by the interval, determines how often snapshots are taken.  
Default: 600  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 10000.  
Required: No

## See Also


For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/timestream-influxdb-2023-01-27/InfluxDBv3CoreParameters) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/timestream-influxdb-2023-01-27/InfluxDBv3CoreParameters) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/timestream-influxdb-2023-01-27/InfluxDBv3CoreParameters)