# [[metric:waiting_sessions]] > Current sessions grouped by wait type and event. --- Current sessions grouped by wait type and event. ## Referenced by wait events {#wait-events} - [Activity/ArchiverMain](/activity/archiver-main/) - [Activity/AutovacuumMain](/activity/autovacuum-main/) - [Activity/BgwriterHibernate](/activity/bgwriter-hibernate/) - [Activity/BgwriterMain](/activity/bgwriter-main/) - [Activity/CheckpointerMain](/activity/checkpointer-main/) - [Activity/CheckpointerShutdown](/activity/checkpointer-shutdown/) - [Activity/IoWorkerMain](/activity/io-worker-main/) - [Activity/LogicalApplyMain](/activity/logical-apply-main/) - [Activity/LogicalLauncherMain](/activity/logical-launcher-main/) - [Activity/LogicalParallelApplyMain](/activity/logical-parallel-apply-main/) - [Activity/PgStatMain](/activity/pg-stat-main/) - [Activity/RecoveryWalStream](/activity/recovery-wal-stream/) - [Activity/ReplicationSlotsyncMain](/activity/replication-slotsync-main/) - [Activity/ReplicationSlotsyncShutdown](/activity/replication-slotsync-shutdown/) - [Activity/SysloggerMain](/activity/syslogger-main/) - [Activity/WalReceiverMain](/activity/wal-receiver-main/) - [Activity/WalSenderMain](/activity/wal-sender-main/) - [Activity/WalSummarizerWal](/activity/wal-summarizer-wal/) - [Activity/WalWriterMain](/activity/wal-writer-main/) - [BufferPin/BufferPin](/bufferpin/buffer-pin/) - [Client/ClientRead](/client/client-read/) - [Client/ClientWrite](/client/client-write/) - [Client/GssOpenServer](/client/gss-open-server/) - [Client/LibpqwalreceiverConnect](/client/libpqwalreceiver-connect/) - [Client/LibpqwalreceiverReceive](/client/libpqwalreceiver-receive/) - [Client/SslOpenServer](/client/ssl-open-server/) - [Client/WaitForStandbyConfirmation](/client/wait-for-standby-confirmation/) - [Client/WalSenderWaitForWal](/client/wal-sender-wait-for-wal/) - [Client/WalSenderWriteData](/client/wal-sender-write-data/) - [Extension/Extension](/extension/) - [IO/AioIoCompletion](/io/aio-io-completion/) - [IO/AioIoUringExecution](/io/aio-io-uring-execution/) - [IO/AioIoUringSubmit](/io/aio-io-uring-submit/) - [IO/BasebackupRead](/io/basebackup-read/) - [IO/BasebackupSync](/io/basebackup-sync/) - [IO/BasebackupWrite](/io/basebackup-write/) - [IO/BuffileRead](/io/buffile-read/) - [IO/BuffileTruncate](/io/buffile-truncate/) - [IO/BuffileWrite](/io/buffile-write/) - [IO/ControlFileRead](/io/control-file-read/) - [IO/ControlFileSync](/io/control-file-sync/) - [IO/ControlFileSyncUpdate](/io/control-file-sync-update/) - [IO/ControlFileWrite](/io/control-file-write/) - [IO/ControlFileWriteUpdate](/io/control-file-write-update/) - [IO/CopyFileCopy](/io/copy-file-copy/) - [IO/CopyFileRead](/io/copy-file-read/) - [IO/CopyFileWrite](/io/copy-file-write/) - [IO/DataFileExtend](/io/data-file-extend/) - [IO/DataFileFlush](/io/data-file-flush/) - [IO/DataFileImmediateSync](/io/data-file-immediate-sync/) - [IO/DataFilePrefetch](/io/data-file-prefetch/) - [IO/DataFileRead](/io/data-file-read/) - [IO/DataFileSync](/io/data-file-sync/) - [IO/DataFileTruncate](/io/data-file-truncate/) - [IO/DataFileWrite](/io/data-file-write/) - [IO/DsmAllocate](/io/dsm-allocate/) - [IO/DsmFillZeroWrite](/io/dsm-fill-zero-write/) - [IO/LockFileAddtodatadirRead](/io/lock-file-addtodatadir-read/) - [IO/LockFileAddtodatadirSync](/io/lock-file-addtodatadir-sync/) - [IO/LockFileAddtodatadirWrite](/io/lock-file-addtodatadir-write/) - [IO/LockFileCreateRead](/io/lock-file-create-read/) - [IO/LockFileCreateSync](/io/lock-file-create-sync/) - [IO/LockFileCreateWrite](/io/lock-file-create-write/) - [IO/LockFileRecheckdatadirRead](/io/lock-file-recheckdatadir-read/) - [IO/LogicalChangesRead](/io/logical-changes-read/) - [IO/LogicalChangesWrite](/io/logical-changes-write/) - [IO/LogicalRewriteCheckpointSync](/io/logical-rewrite-checkpoint-sync/) - [IO/LogicalRewriteMappingSync](/io/logical-rewrite-mapping-sync/) - [IO/LogicalRewriteMappingWrite](/io/logical-rewrite-mapping-write/) - [IO/LogicalRewriteSync](/io/logical-rewrite-sync/) - [IO/LogicalRewriteTruncate](/io/logical-rewrite-truncate/) - [IO/LogicalRewriteWrite](/io/logical-rewrite-write/) - [IO/LogicalSubxactRead](/io/logical-subxact-read/) - [IO/LogicalSubxactWrite](/io/logical-subxact-write/) - [IO/RelationMapRead](/io/relation-map-read/) - [IO/RelationMapReplace](/io/relation-map-replace/) - [IO/RelationMapSync](/io/relation-map-sync/) - [IO/RelationMapWrite](/io/relation-map-write/) - [IO/ReorderBufferRead](/io/reorder-buffer-read/) - [IO/ReorderBufferWrite](/io/reorder-buffer-write/) - [IO/ReorderLogicalMappingRead](/io/reorder-logical-mapping-read/) - [IO/ReplicationSlotRead](/io/replication-slot-read/) - [IO/ReplicationSlotRestoreSync](/io/replication-slot-restore-sync/) - [IO/ReplicationSlotSync](/io/replication-slot-sync/) - [IO/ReplicationSlotWrite](/io/replication-slot-write/) - [IO/SlruFlushSync](/io/slru-flush-sync/) - [IO/SlruRead](/io/slru-read/) - [IO/SlruSync](/io/slru-sync/) - [IO/SlruWrite](/io/slru-write/) - [IO/SnapbuildRead](/io/snapbuild-read/) - [IO/SnapbuildSync](/io/snapbuild-sync/) - [IO/SnapbuildWrite](/io/snapbuild-write/) - [IO/TimelineHistoryFileSync](/io/timeline-history-file-sync/) - [IO/TimelineHistoryFileWrite](/io/timeline-history-file-write/) - [IO/TimelineHistoryRead](/io/timeline-history-read/) - [IO/TimelineHistorySync](/io/timeline-history-sync/) - [IO/TimelineHistoryWrite](/io/timeline-history-write/) - [IO/TwophaseFileRead](/io/twophase-file-read/) - [IO/TwophaseFileSync](/io/twophase-file-sync/) - [IO/TwophaseFileWrite](/io/twophase-file-write/) - [IO/VersionFileSync](/io/version-file-sync/) - [IO/VersionFileWrite](/io/version-file-write/) - [IO/WalBootstrapSync](/io/wal-bootstrap-sync/) - [IO/WalBootstrapWrite](/io/wal-bootstrap-write/) - [IO/WalCopyRead](/io/wal-copy-read/) - [IO/WalCopySync](/io/wal-copy-sync/) - [IO/WalCopyWrite](/io/wal-copy-write/) - [IO/WalInitSync](/io/wal-init-sync/) - [IO/WalInitWrite](/io/wal-init-write/) - [IO/WalRead](/io/wal-read/) - [IO/WalSummaryRead](/io/wal-summary-read/) - [IO/WalSummaryWrite](/io/wal-summary-write/) - [IO/WalSync](/io/wal-sync/) - [IO/WalSyncMethodAssign](/io/wal-sync-method-assign/) - [IO/WalWrite](/io/wal-write/) - [IO/WalsenderTimelineHistoryRead](/io/walsender-timeline-history-read/) - [IPC/AppendReady](/ipc/append-ready/) - [IPC/ArchiveCleanupCommand](/ipc/archive-cleanup-command/) - [IPC/ArchiveCommand](/ipc/archive-command/) - [IPC/BackendTermination](/ipc/backend-termination/) - [IPC/BackupWaitWalArchive](/ipc/backup-wait-wal-archive/) - [IPC/BgworkerShutdown](/ipc/bgworker-shutdown/) - [IPC/BgworkerStartup](/ipc/bgworker-startup/) - [IPC/BtreePage](/ipc/btree-page/) - [IPC/BufferIo](/ipc/buffer-io/) - [IPC/CheckpointDelayComplete](/ipc/checkpoint-delay-complete/) - [IPC/CheckpointDelayStart](/ipc/checkpoint-delay-start/) - [IPC/CheckpointDone](/ipc/checkpoint-done/) - [IPC/CheckpointStart](/ipc/checkpoint-start/) - [IPC/ExecuteGather](/ipc/execute-gather/) - [IPC/HashBatchAllocate](/ipc/hash-batch-allocate/) - [IPC/HashBatchElect](/ipc/hash-batch-elect/) - [IPC/HashBatchLoad](/ipc/hash-batch-load/) - [IPC/HashBuildAllocate](/ipc/hash-build-allocate/) - [IPC/HashBuildElect](/ipc/hash-build-elect/) - [IPC/HashBuildHashInner](/ipc/hash-build-hash-inner/) - [IPC/HashBuildHashOuter](/ipc/hash-build-hash-outer/) - [IPC/HashGrowBatchesDecide](/ipc/hash-grow-batches-decide/) - [IPC/HashGrowBatchesElect](/ipc/hash-grow-batches-elect/) - [IPC/HashGrowBatchesFinish](/ipc/hash-grow-batches-finish/) - [IPC/HashGrowBatchesReallocate](/ipc/hash-grow-batches-reallocate/) - [IPC/HashGrowBatchesRepartition](/ipc/hash-grow-batches-repartition/) - [IPC/HashGrowBucketsElect](/ipc/hash-grow-buckets-elect/) - [IPC/HashGrowBucketsReallocate](/ipc/hash-grow-buckets-reallocate/) - [IPC/HashGrowBucketsReinsert](/ipc/hash-grow-buckets-reinsert/) - [IPC/LogicalApplySendData](/ipc/logical-apply-send-data/) - [IPC/LogicalParallelApplyStateChange](/ipc/logical-parallel-apply-state-change/) - [IPC/LogicalSyncData](/ipc/logical-sync-data/) - [IPC/LogicalSyncStateChange](/ipc/logical-sync-state-change/) - [IPC/MessageQueueInternal](/ipc/message-queue-internal/) - [IPC/MessageQueuePutMessage](/ipc/message-queue-put-message/) - [IPC/MessageQueueReceive](/ipc/message-queue-receive/) - [IPC/MessageQueueSend](/ipc/message-queue-send/) - [IPC/MultixactCreation](/ipc/multixact-creation/) - [IPC/ParallelBitmapScan](/ipc/parallel-bitmap-scan/) - [IPC/ParallelCreateIndexScan](/ipc/parallel-create-index-scan/) - [IPC/ParallelFinish](/ipc/parallel-finish/) - [IPC/ProcSignalBarrier](/ipc/proc-signal-barrier/) - [IPC/ProcarrayGroupUpdate](/ipc/procarray-group-update/) - [IPC/Promote](/ipc/promote/) - [IPC/RecoveryConflictSnapshot](/ipc/recovery-conflict-snapshot/) - [IPC/RecoveryConflictTablespace](/ipc/recovery-conflict-tablespace/) - [IPC/RecoveryEndCommand](/ipc/recovery-end-command/) - [IPC/RecoveryPause](/ipc/recovery-pause/) - [IPC/ReplicationOriginDrop](/ipc/replication-origin-drop/) - [IPC/ReplicationSlotDrop](/ipc/replication-slot-drop/) - [IPC/RestoreCommand](/ipc/restore-command/) - [IPC/SafeSnapshot](/ipc/safe-snapshot/) - [IPC/SyncRep](/ipc/sync-rep/) - [IPC/WalReceiverExit](/ipc/wal-receiver-exit/) - [IPC/WalReceiverUpstreamCatchup](/ipc/wal-receiver-upstream-catchup/) - [IPC/WalReceiverWaitStart](/ipc/wal-receiver-wait-start/) - [IPC/WalSummaryReady](/ipc/wal-summary-ready/) - [IPC/XactGroupUpdate](/ipc/xact-group-update/) - [Lock/advisory](/lock/advisory/) - [Lock/applytransaction](/lock/applytransaction/) - [Lock/extend](/lock/extend/) - [Lock/frozenid](/lock/frozenid/) - [Lock/object](/lock/object/) - [Lock/page](/lock/page/) - [Lock/relation](/lock/relation/) - [Lock/spectoken](/lock/spectoken/) - [Lock/transactionid](/lock/transactionid/) - [Lock/tuple](/lock/tuple/) - [Lock/userlock](/lock/userlock/) - [Lock/virtualxid](/lock/virtualxid/) - [LWLock/AddinShmemInit](/lwlock/addin-shmem-init/) - [LWLock/AioUringCompletion](/lwlock/aio-uring-completion/) - [LWLock/AioWorkerSubmissionQueue](/lwlock/aio-worker-submission-queue/) - [LWLock/AutoFile](/lwlock/auto-file/) - [LWLock/Autovacuum](/lwlock/autovacuum/) - [LWLock/AutovacuumSchedule](/lwlock/autovacuum-schedule/) - [LWLock/BackgroundWorker](/lwlock/background-worker/) - [LWLock/BtreeVacuum](/lwlock/btree-vacuum/) - [LWLock/BufferContent](/lwlock/buffer-content/) - [LWLock/BufferMapping](/lwlock/buffer-mapping/) - [LWLock/Checkpoint](/lwlock/checkpoint/) - [LWLock/CheckpointerComm](/lwlock/checkpointer-comm/) - [LWLock/CommitTs](/lwlock/commit-ts/) - [LWLock/CommitTsBuffer](/lwlock/commit-ts-buffer/) - [LWLock/CommitTsSLRU](/lwlock/commit-ts-slru/) - [LWLock/ControlFile](/lwlock/control-file/) - [LWLock/DSMRegistry](/lwlock/dsm-registry/) - [LWLock/DSMRegistryDSA](/lwlock/dsm-registry-dsa/) - [LWLock/DSMRegistryHash](/lwlock/dsm-registry-hash/) - [LWLock/DynamicSharedMemoryControl](/lwlock/dynamic-shared-memory-control/) - [LWLock/InjectionPoint](/lwlock/injection-point/) - [LWLock/LockFastPath](/lwlock/lock-fast-path/) - [LWLock/LockManager](/lwlock/lock-manager/) - [LWLock/LogicalRepLauncherDSA](/lwlock/logical-rep-launcher-dsa/) - [LWLock/LogicalRepLauncherHash](/lwlock/logical-rep-launcher-hash/) - [LWLock/LogicalRepWorker](/lwlock/logical-rep-worker/) - [LWLock/MultiXactGen](/lwlock/multi-xact-gen/) - [LWLock/MultiXactMemberBuffer](/lwlock/multi-xact-member-buffer/) - [LWLock/MultiXactMemberSLRU](/lwlock/multi-xact-member-slru/) - [LWLock/MultiXactOffsetBuffer](/lwlock/multi-xact-offset-buffer/) - [LWLock/MultiXactOffsetSLRU](/lwlock/multi-xact-offset-slru/) - [LWLock/MultiXactTruncation](/lwlock/multi-xact-truncation/) - [LWLock/NotifyBuffer](/lwlock/notify-buffer/) - [LWLock/NotifyQueue](/lwlock/notify-queue/) - [LWLock/NotifyQueueTail](/lwlock/notify-queue-tail/) - [LWLock/NotifySLRU](/lwlock/notify-slru/) - [LWLock/OidGen](/lwlock/oid-gen/) - [LWLock/OldSnapshotTimeMap](/lwlock/old-snapshot-time-map/) - [LWLock/ParallelAppend](/lwlock/parallel-append/) - [LWLock/ParallelBtreeScan](/lwlock/parallel-btree-scan/) - [LWLock/ParallelHashJoin](/lwlock/parallel-hash-join/) - [LWLock/ParallelQueryDSA](/lwlock/parallel-query-dsa/) - [LWLock/ParallelVacuumDSA](/lwlock/parallel-vacuum-dsa/) - [LWLock/PerSessionDSA](/lwlock/per-session-dsa/) - [LWLock/PerSessionRecordType](/lwlock/per-session-record-type/) - [LWLock/PerSessionRecordTypmod](/lwlock/per-session-record-typmod/) - [LWLock/PerXactPredicateList](/lwlock/per-xact-predicate-list/) - [LWLock/PgStatsDSA](/lwlock/pg-stats-dsa/) - [LWLock/PgStatsData](/lwlock/pg-stats-data/) - [LWLock/PgStatsHash](/lwlock/pg-stats-hash/) - [LWLock/PredicateLockManager](/lwlock/predicate-lock-manager/) - [LWLock/ProcArray](/lwlock/proc-array/) - [LWLock/RelCacheInit](/lwlock/rel-cache-init/) - [LWLock/RelationMapping](/lwlock/relation-mapping/) - [LWLock/ReplicationOrigin](/lwlock/replication-origin/) - [LWLock/ReplicationOriginState](/lwlock/replication-origin-state/) - [LWLock/ReplicationSlotAllocation](/lwlock/replication-slot-allocation/) - [LWLock/ReplicationSlotControl](/lwlock/replication-slot-control/) - [LWLock/ReplicationSlotIO](/lwlock/replication-slot-io/) - [LWLock/SInvalRead](/lwlock/s-inval-read/) - [LWLock/SInvalWrite](/lwlock/s-inval-write/) - [LWLock/SerialBuffer](/lwlock/serial-buffer/) - [LWLock/SerialControl](/lwlock/serial-control/) - [LWLock/SerialSLRU](/lwlock/serial-slru/) - [LWLock/SerializableFinishedList](/lwlock/serializable-finished-list/) - [LWLock/SerializablePredicateList](/lwlock/serializable-predicate-list/) - [LWLock/SerializableXactHash](/lwlock/serializable-xact-hash/) - [LWLock/SharedTidBitmap](/lwlock/shared-tid-bitmap/) - [LWLock/SharedTupleStore](/lwlock/shared-tuple-store/) - [LWLock/ShmemIndex](/lwlock/shmem-index/) - [LWLock/SubtransBuffer](/lwlock/subtrans-buffer/) - [LWLock/SubtransSLRU](/lwlock/subtrans-slru/) - [LWLock/SyncRep](/lwlock/sync-rep/) - [LWLock/SyncScan](/lwlock/sync-scan/) - [LWLock/TablespaceCreate](/lwlock/tablespace-create/) - [LWLock/TwoPhaseState](/lwlock/two-phase-state/) - [LWLock/WALBufMapping](/lwlock/wal-buf-mapping/) - [LWLock/WALInsert](/lwlock/wal-insert/) - [LWLock/WALSummarizer](/lwlock/wal-summarizer/) - [LWLock/WALWrite](/lwlock/wal-write/) - [LWLock/WaitEventCustom](/lwlock/wait-event-custom/) - [LWLock/WrapLimitsVacuum](/lwlock/wrap-limits-vacuum/) - [LWLock/XactBuffer](/lwlock/xact-buffer/) - [LWLock/XactSLRU](/lwlock/xact-slru/) - [LWLock/XactTruncation](/lwlock/xact-truncation/) - [LWLock/XidGen](/lwlock/xid-gen/) - [Timeout/BaseBackupThrottle](/timeout/base-backup-throttle/) - [Timeout/CheckpointWriteDelay](/timeout/checkpoint-write-delay/) - [Timeout/PgSleep](/timeout/pg-sleep/) - [Timeout/RecoveryApplyDelay](/timeout/recovery-apply-delay/) - [Timeout/RecoveryRetrieveRetryInterval](/timeout/recovery-retrieve-retry-interval/) - [Timeout/RegisterSyncRequest](/timeout/register-sync-request/) - [Timeout/SpinDelay](/timeout/spin-delay/) - [Timeout/VacuumDelay](/timeout/vacuum-delay/) - [Timeout/VacuumTruncate](/timeout/vacuum-truncate/) - [Timeout/WalSummarizerError](/timeout/wal-summarizer-error/)