system.metrics

Number of queued or active jobs in the StartupSystemTables thread pool.

### StatelessWorkerThreads[​](#statelessworkerthreads "Direct link to StatelessWorkerThreads")

Number of threads in the stateless worker thread pool.

### StatelessWorkerThreadsActive[​](#statelessworkerthreadsactive "Direct link to StatelessWorkerThreadsActive")

Number of threads in the stateless worker thread pool running a task.

### StatelessWorkerThreadsScheduled[​](#statelessworkerthreadsscheduled "Direct link to StatelessWorkerThreadsScheduled")

Number of queued or active jobs in the stateless worker thread pool.

### StorageBufferBytes[​](#storagebufferbytes "Direct link to StorageBufferBytes")

Number of bytes in buffers of Buffer tables

### StorageBufferFlushThreads[​](#storagebufferflushthreads "Direct link to StorageBufferFlushThreads")

Number of threads for background flushes in StorageBuffer

### StorageBufferFlushThreadsActive[​](#storagebufferflushthreadsactive "Direct link to StorageBufferFlushThreadsActive")

Number of threads for background flushes in StorageBuffer running a task

### StorageBufferFlushThreadsScheduled[​](#storagebufferflushthreadsscheduled "Direct link to StorageBufferFlushThreadsScheduled")

Number of queued or active threads for background flushes in StorageBuffer

### StorageBufferRows[​](#storagebufferrows "Direct link to StorageBufferRows")

Number of rows in buffers of Buffer tables

### StorageConnectionsStored[​](#storageconnectionsstored "Direct link to StorageConnectionsStored")

Total count of sessions stored in the session pool for storages

### StorageConnectionsTotal[​](#storageconnectionstotal "Direct link to StorageConnectionsTotal")

Total count of all sessions: stored in the pool and actively used right now for storages

### StorageDistributedThreads[​](#storagedistributedthreads "Direct link to StorageDistributedThreads")

Number of threads in the StorageDistributed thread pool.

### StorageDistributedThreadsActive[​](#storagedistributedthreadsactive "Direct link to StorageDistributedThreadsActive")

Number of threads in the StorageDistributed thread pool running a task.

### StorageDistributedThreadsScheduled[​](#storagedistributedthreadsscheduled "Direct link to StorageDistributedThreadsScheduled")

Number of queued or active jobs in the StorageDistributed thread pool.

### StorageHiveThreads[​](#storagehivethreads "Direct link to StorageHiveThreads")

Number of threads in the StorageHive thread pool.

### StorageHiveThreadsActive[​](#storagehivethreadsactive "Direct link to StorageHiveThreadsActive")

Number of threads in the StorageHive thread pool running a task.

### StorageHiveThreadsScheduled[​](#storagehivethreadsscheduled "Direct link to StorageHiveThreadsScheduled")

Number of queued or active jobs in the StorageHive thread pool.

### StorageObjectStorageThreads[​](#storageobjectstoragethreads "Direct link to StorageObjectStorageThreads")

Number of threads in the remote table engines thread pools.

### StorageObjectStorageThreadsActive[​](#storageobjectstoragethreadsactive "Direct link to StorageObjectStorageThreadsActive")

Number of threads in the remote table engines thread pool running a task.

### StorageObjectStorageThreadsScheduled[​](#storageobjectstoragethreadsscheduled "Direct link to StorageObjectStorageThreadsScheduled")

Number of queued or active jobs in remote table engines thread pool.

### StorageS3Threads[​](#storages3threads "Direct link to StorageS3Threads")

Number of threads in the StorageS3 thread pool.

### StorageS3ThreadsActive[​](#storages3threadsactive "Direct link to StorageS3ThreadsActive")

Number of threads in the StorageS3 thread pool running a task.

### StorageS3ThreadsScheduled[​](#storages3threadsscheduled "Direct link to StorageS3ThreadsScheduled")

Number of queued or active jobs in the StorageS3 thread pool.

### SystemDatabaseReplicasThreads[​](#systemdatabasereplicasthreads "Direct link to SystemDatabaseReplicasThreads")

Number of threads in the system.database\_replicas thread pool.

### SystemDatabaseReplicasThreadsActive[​](#systemdatabasereplicasthreadsactive "Direct link to SystemDatabaseReplicasThreadsActive")

Number of threads in the system.database\_replicas thread pool running a task.

### SystemDatabaseReplicasThreadsScheduled[​](#systemdatabasereplicasthreadsscheduled "Direct link to SystemDatabaseReplicasThreadsScheduled")

Number of queued or active jobs in the system.database\_replicas thread pool.

### SystemReplicasThreads[​](#systemreplicasthreads "Direct link to SystemReplicasThreads")

Number of threads in the system.replicas thread pool.

### SystemReplicasThreadsActive[​](#systemreplicasthreadsactive "Direct link to SystemReplicasThreadsActive")

Number of threads in the system.replicas thread pool running a task.

### SystemReplicasThreadsScheduled[​](#systemreplicasthreadsscheduled "Direct link to SystemReplicasThreadsScheduled")

Number of queued or active jobs in the system.replicas thread pool.

### TCPConnection[​](#tcpconnection "Direct link to TCPConnection")

Number of connections to TCP server (clients with native interface), also included server-server distributed query connections

### TablesLoaderBackgroundThreads[​](#tablesloaderbackgroundthreads "Direct link to TablesLoaderBackgroundThreads")

Number of threads in the tables loader background thread pool.

### TablesLoaderBackgroundThreadsActive[​](#tablesloaderbackgroundthreadsactive "Direct link to TablesLoaderBackgroundThreadsActive")

Number of threads in the tables loader background thread pool running a task.

### TablesLoaderBackgroundThreadsScheduled[​](#tablesloaderbackgroundthreadsscheduled "Direct link to TablesLoaderBackgroundThreadsScheduled")

Number of queued or active jobs in the tables loader background thread pool.

### TablesLoaderForegroundThreads[​](#tablesloaderforegroundthreads "Direct link to TablesLoaderForegroundThreads")

Number of threads in the tables loader foreground thread pool.

### TablesLoaderForegroundThreadsActive[​](#tablesloaderforegroundthreadsactive "Direct link to TablesLoaderForegroundThreadsActive")

Number of threads in the tables loader foreground thread pool running a task.

### TablesLoaderForegroundThreadsScheduled[​](#tablesloaderforegroundthreadsscheduled "Direct link to TablesLoaderForegroundThreadsScheduled")

Number of queued or active jobs in the tables loader foreground thread pool.

### TablesToDropQueueSize[​](#tablestodropqueuesize "Direct link to TablesToDropQueueSize")

Number of dropped tables, that are waiting for background data removal.

### TaskTrackerThreads[​](#tasktrackerthreads "Direct link to TaskTrackerThreads")

Number of threads used by the distributed query remote task tracker.

### TaskTrackerThreadsActive[​](#tasktrackerthreadsactive "Direct link to TaskTrackerThreadsActive")

Number of threads in the distributed query remote task tracker thread pool running a task.

### TaskTrackerThreadsScheduled[​](#tasktrackerthreadsscheduled "Direct link to TaskTrackerThreadsScheduled")

Number of queued or active jobs in the distributed query remote task tracker thread pool.

### TemporaryFilesForAggregation[​](#temporaryfilesforaggregation "Direct link to TemporaryFilesForAggregation")

Number of temporary files created for external aggregation

### TemporaryFilesForJoin[​](#temporaryfilesforjoin "Direct link to TemporaryFilesForJoin")

Number of temporary files created for JOIN

### TemporaryFilesForMerge[​](#temporaryfilesformerge "Direct link to TemporaryFilesForMerge")

Number of temporary files for vertical merge

### TemporaryFilesForSort[​](#temporaryfilesforsort "Direct link to TemporaryFilesForSort")

Number of temporary files created for external sorting

### TemporaryFilesUnknown[​](#temporaryfilesunknown "Direct link to TemporaryFilesUnknown")

Number of temporary files created without known purpose

### TextIndexHeaderCacheBytes[​](#textindexheadercachebytes "Direct link to TextIndexHeaderCacheBytes")

Size of the text index header cache in bytes

### TextIndexHeaderCacheCells[​](#textindexheadercachecells "Direct link to TextIndexHeaderCacheCells")