27.2. The Cumulative Statistics System

pg_stat_activity

One row per server process, showing information related to the current activity of that process, such as state and current query. See pg_stat_activity for details.

pg_stat_replication

One row per WAL sender process, showing statistics about replication to that sender's connected standby server. See pg_stat_replication for details.

pg_stat_wal_receiver

Only one row, showing statistics about the WAL receiver from that receiver's connected server. See pg_stat_wal_receiver for details.

pg_stat_recovery_prefetch

Only one row, showing statistics about blocks prefetched during recovery. See pg_stat_recovery_prefetch for details.

pg_stat_subscription

At least one row per subscription, showing information about the subscription workers. See pg_stat_subscription for details.

pg_stat_ssl

One row per connection (regular and replication), showing information about SSL used on this connection. See pg_stat_ssl for details.

pg_stat_gssapi

One row per connection (regular and replication), showing information about GSSAPI authentication and encryption used on this connection. See pg_stat_gssapi for details.

pg_stat_progress_analyze

One row for each backend (including autovacuum worker processes) running ANALYZE, showing current progress. See ANALYZE Progress Reporting.

pg_stat_progress_create_index

One row for each backend running CREATE INDEX or REINDEX, showing current progress. See CREATE INDEX Progress Reporting.

pg_stat_progress_vacuum

One row for each backend (including autovacuum worker processes) running VACUUM, showing current progress. See VACUUM Progress Reporting.

pg_stat_progress_cluster

One row for each backend running CLUSTER or VACUUM FULL, showing current progress. See CLUSTER Progress Reporting.

pg_stat_progress_basebackup

One row for each WAL sender process streaming a base backup, showing current progress. See Base Backup Progress Reporting.

pg_stat_progress_copy

One row for each backend running COPY, showing current progress. See COPY Progress Reporting.

pg_stat_archiver

One row only, showing statistics about the WAL archiver process's activity. See pg_stat_archiver for details.

pg_stat_bgwriter

One row only, showing statistics about the background writer process's activity. See pg_stat_bgwriter for details.

pg_stat_checkpointer

One row only, showing statistics about the checkpointer process's activity. See pg_stat_checkpointer for details.

pg_stat_database

One row per database, showing database-wide statistics. See pg_stat_database for details.

pg_stat_database_conflicts

One row per database, showing database-wide statistics about query cancels due to conflict with recovery on standby servers. See pg_stat_database_conflicts for details.

pg_stat_io

One row for each combination of backend type, context, and target object containing cluster-wide I/O statistics. See pg_stat_io for details.

pg_stat_replication_slots

One row per replication slot, showing statistics about the replication slot's usage. See pg_stat_replication_slots for details.

pg_stat_slru

One row per SLRU, showing statistics of operations. See pg_stat_slru for details.

pg_stat_subscription_stats

One row per subscription, showing statistics about errors and conflicts. See pg_stat_subscription_stats for details.

pg_stat_wal

One row only, showing statistics about WAL activity. See pg_stat_wal for details.

pg_stat_all_tables

One row for each table in the current database, showing statistics about accesses to that specific table. See pg_stat_all_tables for details.

pg_stat_sys_tables

Same as pg_stat_all_tables, except that only system tables are shown.

pg_stat_user_tables

Same as pg_stat_all_tables, except that only user tables are shown.

pg_stat_xact_all_tables

Similar to pg_stat_all_tables, but counts actions taken so far within the current transaction (which are not yet included in pg_stat_all_tables and related views). The columns for numbers of live and dead rows and vacuum and analyze actions are not present in this view.

pg_stat_xact_sys_tables

Same as pg_stat_xact_all_tables, except that only system tables are shown.

pg_stat_xact_user_tables

Same as pg_stat_xact_all_tables, except that only user tables are shown.

pg_stat_all_indexes

One row for each index in the current database, showing statistics about accesses to that specific index. See pg_stat_all_indexes for details.

pg_stat_sys_indexes

Same as pg_stat_all_indexes, except that only indexes on system tables are shown.

pg_stat_user_indexes

Same as pg_stat_all_indexes, except that only indexes on user tables are shown.

pg_stat_user_functions

One row for each tracked function, showing statistics about executions of that function. See pg_stat_user_functions for details.

pg_stat_xact_user_functions

Similar to pg_stat_user_functions, but counts only calls during the current transaction (which are not yet included in pg_stat_user_functions).

pg_statio_all_tables

One row for each table in the current database, showing statistics about I/O on that specific table. See pg_statio_all_tables for details.

pg_statio_sys_tables

Same as pg_statio_all_tables, except that only system tables are shown.

pg_statio_user_tables

Same as pg_statio_all_tables, except that only user tables are shown.

pg_statio_all_indexes

One row for each index in the current database, showing statistics about I/O on that specific index. See pg_statio_all_indexes for details.

pg_statio_sys_indexes

Same as pg_statio_all_indexes, except that only indexes on system tables are shown.

pg_statio_user_indexes

Same as pg_statio_all_indexes, except that only indexes on user tables are shown.

pg_statio_all_sequences

One row for each sequence in the current database, showing statistics about I/O on that specific sequence. See pg_statio_all_sequences for details.

pg_statio_sys_sequences

Same as pg_statio_all_sequences, except that only system sequences are shown. (Presently, no system sequences are defined, so this view is always empty.)

pg_statio_user_sequences

Same as pg_statio_all_sequences, except that only user sequences are shown.

datid oid

OID of the database this backend is connected to

datname name

Name of the database this backend is connected to

pid integer

Process ID of this backend

leader_pid integer

Process ID of the parallel group leader if this process is a parallel query worker, or process ID of the leader apply worker if this process is a parallel apply worker. NULL indicates that this process is a parallel group leader or leader apply worker, or does not participate in any parallel operation.

usesysid oid

OID of the user logged into this backend

usename name

Name of the user logged into this backend

application_name text

Name of the application that is connected to this backend

client_addr inet

IP address of the client connected to this backend. If this field is null, it indicates either that the client is connected via a Unix socket on the server machine or that this is an internal process such as autovacuum.

client_hostname text

Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This field will only be non-null for IP connections, and only when [log_hostname (boolean)

   log_hostname configuration parameter](braised:ref/runtime-config-logging#log-hostname-boolean-log-hostname-configuration-parameter) is enabled.

client_port integer

TCP port number that the client is using for communication with this backend, or -1 if a Unix socket is used. If this field is null, it indicates that this is an internal server process.

backend_start timestamp with time zone

Time when this process was started. For client backends, this is the time the client connected to the server.

xact_start timestamp with time zone

Time when this process' current transaction was started, or null if no transaction is active. If the current query is the first of its transaction, this column is equal to the query_start column.

query_start timestamp with time zone

Time when the currently active query was started, or if state is not active, when the last query was started

state_change timestamp with time zone

Time when the state was last changed

wait_event_type text

The type of event for which the backend is waiting, if any; otherwise NULL. See Wait Event Types.

wait_event text

Wait event name if backend is currently waiting, otherwise NULL. See Wait Events of Type through Wait Events of Type .

state text

Current overall state of this backend. Possible values are:

• starting: The backend is in initial startup. Client authentication is performed during this phase.

• active: The backend is executing a query.

• idle: The backend is waiting for a new client command.

• idle in transaction: The backend is in a transaction, but is not currently executing a query.

• idle in transaction (aborted): This state is similar to idle in transaction, except one of the statements in the transaction caused an error.

• fastpath function call: The backend is executing a fast-path function.

• disabled: This state is reported if [track_activities (boolean)

  track_activities configuration parameter](braised:ref/runtime-config-statistics#track-activities-boolean-track-activities-configuration-parameter) is disabled in this backend. :::{/row}

backend_xid xid

Top-level transaction identifier of this backend, if any; see Transactions and Identifiers.

backend_xmin xid

The current backend's xmin horizon.

query_id bigint

Identifier of this backend's most recent query. If state is active this field shows the identifier of the currently executing query. In all other states, it shows the identifier of last query that was executed. Query identifiers are not computed by default so this field will be null unless [compute_query_id (enum)

   compute_query_id configuration parameter](braised:ref/runtime-config-statistics#compute-query-id-enum-compute-query-id-configuration-parameter) parameter is enabled or a third-party module that computes query identifiers is configured.

query text

Text of this backend's most recent query. If state is active this field shows the currently executing query. In all other states, it shows the last query that was executed. By default the query text is truncated at 1024 bytes; this value can be changed via the parameter [track_activity_query_size (integer)

   track_activity_query_size configuration parameter](braised:ref/runtime-config-statistics#track-activity-query-size-integer-track-activity-query-size-configuration-parameter).

backend_type text

Type of current backend. Possible types are autovacuum launcher, autovacuum worker, logical replication launcher, logical replication worker, parallel worker, background writer, client backend, checkpointer, archiver, standalone backend, startup, walreceiver, walsender, walwriter and walsummarizer. In addition, background workers registered by extensions may have additional types.

Activity

The server process is idle. This event type indicates a process waiting for activity in its main processing loop. wait_event will identify the specific wait point; see Wait Events of Type .

BufferPin

The server process is waiting for exclusive access to a data buffer. Buffer pin waits can be protracted if another process holds an open cursor that last read data from the buffer in question. See Wait Event Types.

Client

The server process is waiting for activity on a socket connected to a user application. Thus, the server expects something to happen that is independent of its internal processes. wait_event will identify the specific wait point; see Wait Events of Type .

Extension

The server process is waiting for some condition defined by an extension module. See Wait Events of Type .

InjectionPoint

The server process is waiting for an injection point to reach an outcome defined in a test. See Injection Points for more details. This type has no predefined wait points.

IO

The server process is waiting for an I/O operation to complete. wait_event will identify the specific wait point; see Wait Events of Type .

IPC

The server process is waiting for some interaction with another server process. wait_event will identify the specific wait point; see Wait Events of Type .

Lock

The server process is waiting for a heavyweight lock. Heavyweight locks, also known as lock manager locks or simply locks, primarily protect SQL-visible objects such as tables. However, they are also used to ensure mutual exclusion for certain internal operations such as relation extension. wait_event will identify the type of lock awaited; see Wait Events of Type .

LWLock

The server process is waiting for a lightweight lock. Most such locks protect a particular data structure in shared memory. wait_event will contain a name identifying the purpose of the lightweight lock. (Some locks have specific names; others are part of a group of locks each with a similar purpose.) See Wait Events of Type .

Timeout

The server process is waiting for a timeout to expire. wait_event will identify the specific wait point; see Wait Events of Type .

ArchiverMain

Waiting in main loop of archiver process.

AutovacuumMain

Waiting in main loop of autovacuum launcher process.

BgwriterHibernate

Waiting in background writer process, hibernating.

BgwriterMain

Waiting in main loop of background writer process.

CheckpointerMain

Waiting in main loop of checkpointer process.

CheckpointerShutdown

Waiting for checkpointer process to be terminated.

IoWorkerMain

Waiting in main loop of IO Worker process.

LogicalApplyMain

Waiting in main loop of logical replication apply process.

LogicalLauncherMain

Waiting in main loop of logical replication launcher process.

LogicalParallelApplyMain

Waiting in main loop of logical replication parallel apply process.

RecoveryWalStream

Waiting in main loop of startup process for WAL to arrive, during streaming recovery.

ReplicationSlotsyncMain

Waiting in main loop of slot synchronization.

ReplicationSlotsyncShutdown

Waiting for slot sync worker to shut down.

SysloggerMain

Waiting in main loop of syslogger process.

WalReceiverMain

Waiting in main loop of WAL receiver process.

WalSenderMain

Waiting in main loop of WAL sender process.

WalSummarizerWal

Waiting in WAL summarizer for more WAL to be generated.

WalWriterMain

Waiting in main loop of WAL writer process.

BufferCleanup

Waiting to acquire an exclusive pin on a buffer. Buffer pin waits can be protracted if another process holds an open cursor that last read data from the buffer in question.

BufferExclusive

Waiting to acquire a exclusive lock on a buffer.

BufferShared

Waiting to acquire a shared lock on a buffer.

BufferShareExclusive

Waiting to acquire a share exclusive lock on a buffer.

ClientRead

Waiting to read data from the client.

ClientWrite

Waiting to write data to the client.

GssOpenServer

Waiting to read data from the client while establishing a GSSAPI session.

LibpqwalreceiverConnect

Waiting in WAL receiver to establish connection to remote server.

LibpqwalreceiverReceive

Waiting in WAL receiver to receive data from remote server.

SslOpenServer

Waiting for SSL while attempting connection.

WaitForStandbyConfirmation

Waiting for WAL to be received and flushed by the physical standby.

WaitForWalFlush

Waiting for WAL flush to reach a target LSN on a primary or standby.

WaitForWalReplay

Waiting for WAL replay to reach a target LSN on a standby.

WaitForWalWrite

Waiting for WAL write to reach a target LSN on a standby.

WalSenderWaitForWal

Waiting for WAL to be flushed in WAL sender process.

WalSenderWriteData

Waiting for any activity when processing replies from WAL receiver in WAL sender process.

Extension

Waiting in an extension.

AioIoCompletion

Waiting for another process to complete IO.

AioIoUringExecution

Waiting for IO execution via io_uring.

AioIoUringSubmit

Waiting for IO submission via io_uring.

BasebackupRead

Waiting for base backup to read from a file.

BasebackupSync

Waiting for data written by a base backup to reach durable storage.

BasebackupWrite

Waiting for base backup to write to a file.

BuffileRead

Waiting for a read from a buffered file.

BuffileTruncate

Waiting for a buffered file to be truncated.

BuffileWrite

Waiting for a write to a buffered file.

ControlFileRead

Waiting for a read from the pg_control file.

ControlFileSync

Waiting for the pg_control file to reach durable storage.

ControlFileSyncUpdate

Waiting for an update to the pg_control file to reach durable storage.

ControlFileWrite

Waiting for a write to the pg_control file.

ControlFileWriteUpdate

Waiting for a write to update the pg_control file.

CopyFileCopy

Waiting for a file copy operation.

CopyFileRead

Waiting for a read during a file copy operation.

CopyFileWrite

Waiting for a write during a file copy operation.

CopyFromRead

Waiting to read data from a pipe, a file or a program during COPY FROM.

CopyToWrite

Waiting to write data to a pipe, a file or a program during COPY TO.

DataFileExtend

Waiting for a relation data file to be extended.

DataFileFlush

Waiting for a relation data file to reach durable storage.

DataFileImmediateSync

Waiting for an immediate synchronization of a relation data file to durable storage.

DataFilePrefetch

Waiting for an asynchronous prefetch from a relation data file.

DataFileRead

Waiting for a read from a relation data file.

DataFileSync

Waiting for changes to a relation data file to reach durable storage.

DataFileTruncate

Waiting for a relation data file to be truncated.

DataFileWrite

Waiting for a write to a relation data file.

DsmAllocate

Waiting for a dynamic shared memory segment to be allocated.

DsmFillZeroWrite

Waiting to fill a dynamic shared memory backing file with zeroes.

LockFileAddtodatadirRead

Waiting for a read while adding a line to the data directory lock file.

LockFileAddtodatadirSync

Waiting for data to reach durable storage while adding a line to the data directory lock file.

LockFileAddtodatadirWrite

Waiting for a write while adding a line to the data directory lock file.

LockFileCreateRead

Waiting to read while creating the data directory lock file.

LockFileCreateSync

Waiting for data to reach durable storage while creating the data directory lock file.

LockFileCreateWrite

Waiting for a write while creating the data directory lock file.

LockFileRecheckdatadirRead

Waiting for a read during recheck of the data directory lock file.

LogicalRewriteCheckpointSync

Waiting for logical rewrite mappings to reach durable storage during a checkpoint.

LogicalRewriteMappingSync

Waiting for mapping data to reach durable storage during a logical rewrite.

LogicalRewriteMappingWrite

Waiting for a write of mapping data during a logical rewrite.

LogicalRewriteSync

Waiting for logical rewrite mappings to reach durable storage.

LogicalRewriteTruncate

Waiting for truncate of mapping data during a logical rewrite.

LogicalRewriteWrite

Waiting for a write of logical rewrite mappings.

RelationMapRead

Waiting for a read of the relation map file.

RelationMapReplace

Waiting for durable replacement of a relation map file.

RelationMapWrite

Waiting for a write to the relation map file.

ReorderBufferRead

Waiting for a read during reorder buffer management.

ReorderBufferWrite

Waiting for a write during reorder buffer management.

ReorderLogicalMappingRead

Waiting for a read of a logical mapping during reorder buffer management.

ReplicationSlotRead

Waiting for a read from a replication slot control file.

ReplicationSlotRestoreSync

Waiting for a replication slot control file to reach durable storage while restoring it to memory.

ReplicationSlotSync

Waiting for a replication slot control file to reach durable storage.

ReplicationSlotWrite

Waiting for a write to a replication slot control file.

SlruFlushSync

Waiting for SLRU data to reach durable storage during a checkpoint or database shutdown.

SlruRead

Waiting for a read of an SLRU page.

SlruSync

Waiting for SLRU data to reach durable storage following a page write.

SlruWrite

Waiting for a write of an SLRU page.

SnapbuildRead

Waiting for a read of a serialized historical catalog snapshot.

SnapbuildSync

Waiting for a serialized historical catalog snapshot to reach durable storage.

SnapbuildWrite

Waiting for a write of a serialized historical catalog snapshot.

TimelineHistoryFileSync

Waiting for a timeline history file received via streaming replication to reach durable storage.

TimelineHistoryFileWrite

Waiting for a write of a timeline history file received via streaming replication.

TimelineHistoryRead

Waiting for a read of a timeline history file.

TimelineHistorySync

Waiting for a newly created timeline history file to reach durable storage.

TimelineHistoryWrite

Waiting for a write of a newly created timeline history file.

TwophaseFileRead

Waiting for a read of a two phase state file.

TwophaseFileSync

Waiting for a two phase state file to reach durable storage.

TwophaseFileWrite

Waiting for a write of a two phase state file.

VersionFileSync

Waiting for the version file to reach durable storage while creating a database.

VersionFileWrite

Waiting for the version file to be written while creating a database.

WalsenderTimelineHistoryRead

Waiting for a read from a timeline history file during a walsender timeline command.

WalBootstrapSync

Waiting for WAL to reach durable storage during bootstrapping.

WalBootstrapWrite

Waiting for a write of a WAL page during bootstrapping.

WalCopyRead

Waiting for a read when creating a new WAL segment by copying an existing one.

WalCopySync

Waiting for a new WAL segment created by copying an existing one to reach durable storage.

WalCopyWrite

Waiting for a write when creating a new WAL segment by copying an existing one.

WalInitSync

Waiting for a newly initialized WAL file to reach durable storage.

WalInitWrite

Waiting for a write while initializing a new WAL file.

WalRead

Waiting for a read from a WAL file.

WalSummaryRead

Waiting for a read from a WAL summary file.

WalSummaryWrite

Waiting for a write to a WAL summary file.

WalSync

Waiting for a WAL file to reach durable storage.

WalSyncMethodAssign

Waiting for data to reach durable storage while assigning a new WAL sync method.

WalWrite

Waiting for a write to a WAL file.

AppendReady

Waiting for subplan nodes of an Append plan node to be ready.

ArchiveCleanupCommand

Waiting for [archive_cleanup_command (string)

    archive_cleanup_command configuration parameter](braised:ref/runtime-config-wal#archive-cleanup-command-string-archive-cleanup-command-configuration-parameter) to complete.

ArchiveCommand

Waiting for [archive_command (string)

   archive_command configuration parameter](braised:ref/runtime-config-wal#archive-command-string-archive-command-configuration-parameter) to complete.

BackendTermination

Waiting for the termination of another backend.

BackupWaitWalArchive

Waiting for WAL files required for a backup to be successfully archived.

BgworkerShutdown

Waiting for background worker to shut down.

BgworkerStartup

Waiting for background worker to start up.

BtreePage

Waiting for the page number needed to continue a parallel B-tree scan to become available.

BufferIo

Waiting for buffer I/O to complete.

CheckpointDelayComplete

Waiting for a backend that blocks a checkpoint from completing.

CheckpointDelayStart

Waiting for a backend that blocks a checkpoint from starting.

CheckpointDone

Waiting for a checkpoint to complete.

CheckpointStart

Waiting for a checkpoint to start.

ExecuteGather

Waiting for activity from a child process while executing a Gather plan node.

HashBatchAllocate

Waiting for an elected Parallel Hash participant to allocate a hash table.

HashBatchElect

Waiting to elect a Parallel Hash participant to allocate a hash table.

HashBatchLoad

Waiting for other Parallel Hash participants to finish loading a hash table.

HashBuildAllocate

Waiting for an elected Parallel Hash participant to allocate the initial hash table.

HashBuildElect

Waiting to elect a Parallel Hash participant to allocate the initial hash table.

HashBuildHashInner

Waiting for other Parallel Hash participants to finish hashing the inner relation.

HashBuildHashOuter

Waiting for other Parallel Hash participants to finish partitioning the outer relation.

HashGrowBatchesDecide

Waiting to elect a Parallel Hash participant to decide on future batch growth.

HashGrowBatchesElect

Waiting to elect a Parallel Hash participant to allocate more batches.

HashGrowBatchesFinish

Waiting for an elected Parallel Hash participant to decide on future batch growth.

HashGrowBatchesReallocate

Waiting for an elected Parallel Hash participant to allocate more batches.

HashGrowBatchesRepartition

Waiting for other Parallel Hash participants to finish repartitioning.

HashGrowBucketsElect

Waiting to elect a Parallel Hash participant to allocate more buckets.

HashGrowBucketsReallocate

Waiting for an elected Parallel Hash participant to finish allocating more buckets.

HashGrowBucketsReinsert

Waiting for other Parallel Hash participants to finish inserting tuples into new buckets.

LogicalApplySendData

Waiting for a logical replication leader apply process to send data to a parallel apply process.

LogicalParallelApplyStateChange

Waiting for a logical replication parallel apply process to change state.

LogicalSyncData

Waiting for a logical replication remote server to send data for initial table synchronization.

LogicalSyncStateChange

Waiting for a logical replication remote server to change state.

MessageQueueInternal

Waiting for another process to be attached to a shared message queue.

MessageQueuePutMessage

Waiting to write a protocol message to a shared message queue.

MessageQueueReceive

Waiting to receive bytes from a shared message queue.

MessageQueueSend

Waiting to send bytes to a shared message queue.

MultixactCreation

Waiting for a multixact creation to complete.

ParallelBitmapScan

Waiting for parallel bitmap scan to become initialized.

ParallelCreateIndexScan

Waiting for parallel CREATE INDEX workers to finish heap scan.

ParallelFinish

Waiting for parallel workers to finish computing.

ProcarrayGroupUpdate

Waiting for the group leader to clear the transaction ID at transaction end.

ProcSignalBarrier

Waiting for a barrier event to be processed by all backends.

Promote

Waiting for standby promotion.

RecoveryConflictSnapshot

Waiting for recovery conflict resolution for a vacuum cleanup.

RecoveryConflictTablespace

Waiting for recovery conflict resolution for dropping a tablespace.

RecoveryEndCommand

Waiting for [recovery_end_command (string)

    recovery_end_command configuration parameter](braised:ref/runtime-config-wal#recovery-end-command-string-recovery-end-command-configuration-parameter) to complete.

RecoveryPause

Waiting for recovery to be resumed.

ReplicationOriginDrop

Waiting for a replication origin to become inactive so it can be dropped.

ReplicationSlotDrop

Waiting for a replication slot to become inactive so it can be dropped.

RestoreCommand

Waiting for [restore_command (string)

    restore_command configuration parameter](braised:ref/runtime-config-wal#restore-command-string-restore-command-configuration-parameter) to complete.

SafeSnapshot

Waiting to obtain a valid snapshot for a READ ONLY DEFERRABLE transaction.

SyncRep

Waiting for confirmation from a remote server during synchronous replication.

WalReceiverExit

Waiting for the WAL receiver to exit.

WalReceiverWaitStart

Waiting for startup process to send initial data for streaming replication.

WalSummaryReady

Waiting for a new WAL summary to be generated.

XactGroupUpdate

Waiting for the group leader to update transaction status at transaction end.

advisory

Waiting to acquire an advisory user lock.

applytransaction

Waiting to acquire a lock on a remote transaction being applied by a logical replication subscriber.

extend

Waiting to extend a relation.

frozenid

Waiting to update pg_database.datfrozenxid and pg_database.datminmxid.

object

Waiting to acquire a lock on a non-relation database object.

page

Waiting to acquire a lock on a page of a relation.

relation

Waiting to acquire a lock on a relation.

spectoken

Waiting to acquire a speculative insertion lock.

transactionid

Waiting for a transaction to finish.

tuple

Waiting to acquire a lock on a tuple.

userlock

Waiting to acquire a user lock.

virtualxid

Waiting to acquire a virtual transaction ID lock; see Transactions and Identifiers.

AddinShmemInit

Waiting to manage an extension's space allocation in shared memory.

AioUringCompletion

Waiting for another process to complete IO via io_uring.

AioWorkerSubmissionQueue

Waiting to access AIO worker submission queue.

AutoFile

Waiting to update the postgresql.auto.conf file.

Autovacuum

Waiting to read or update the current state of autovacuum workers.

AutovacuumSchedule

Waiting to ensure that a table selected for autovacuum still needs vacuuming.

BackgroundWorker

Waiting to read or update background worker state.

BtreeVacuum

Waiting to read or update vacuum-related information for a B-tree index.

BufferMapping

Waiting to associate a data block with a buffer in the buffer pool.

CheckpointerComm

Waiting to manage fsync requests.

CommitTs

Waiting to read or update the last value set for a transaction commit timestamp.

CommitTsBuffer

Waiting for I/O on a commit timestamp SLRU buffer.

CommitTsSLRU

Waiting to access the commit timestamp SLRU cache.

ControlFile

Waiting to read or update the pg_control file or create a new WAL file.

DSMRegistry

Waiting to read or update the dynamic shared memory registry.

DSMRegistryDSA

Waiting to access dynamic shared memory registry's dynamic shared memory allocator.

DSMRegistryHash

Waiting to access dynamic shared memory registry's shared hash table.

DynamicSharedMemoryControl

Waiting to read or update dynamic shared memory allocation information.

InjectionPoint

Waiting to read or update information related to injection points.

LockFastPath

Waiting to read or update a process' fast-path lock information.

LockManager

Waiting to read or update information about "heavyweight" locks.

LogicalDecodingControl

Waiting to read or update logical decoding status information.

LogicalRepLauncherDSA

Waiting to access logical replication launcher's dynamic shared memory allocator.

LogicalRepLauncherHash

Waiting to access logical replication launcher's shared hash table.

LogicalRepWorker

Waiting to read or update the state of logical replication workers.

MultiXactGen

Waiting to read or update shared multixact state.

MultiXactMemberBuffer

Waiting for I/O on a multixact member SLRU buffer.

MultiXactMemberSLRU

Waiting to access the multixact member SLRU cache.

MultiXactOffsetBuffer

Waiting for I/O on a multixact offset SLRU buffer.

MultiXactOffsetSLRU

Waiting to access the multixact offset SLRU cache.

MultiXactTruncation

Waiting to read or truncate multixact information.

NotifyBuffer

Waiting for I/O on a NOTIFY message SLRU buffer.

NotifyChannelHash

Waiting to access the NOTIFY channel hash table.

NotifyQueue

Waiting to read or update NOTIFY messages.

NotifyQueueTail

Waiting to update limit on NOTIFY message storage.

NotifySLRU

Waiting to access the NOTIFY message SLRU cache.

OidGen

Waiting to allocate a new OID.

ParallelAppend

Waiting to choose the next subplan during Parallel Append plan execution.

ParallelBtreeScan

Waiting to synchronize workers during Parallel B-tree scan plan execution.

ParallelHashJoin

Waiting to synchronize workers during Parallel Hash Join plan execution.

ParallelQueryDSA

Waiting for parallel query dynamic shared memory allocation.

ParallelVacuumDSA

Waiting for parallel vacuum dynamic shared memory allocation.

PerSessionDSA

Waiting for parallel query dynamic shared memory allocation.

PerSessionRecordType

Waiting to access a parallel query's information about composite types.

PerSessionRecordTypmod

Waiting to access a parallel query's information about type modifiers that identify anonymous record types.

PerXactPredicateList

Waiting to access the list of predicate locks held by the current serializable transaction during a parallel query.

PgStatsData

Waiting for shared memory stats data access.

PgStatsDSA

Waiting for stats dynamic shared memory allocator access.

PgStatsHash

Waiting for stats shared memory hash table access.

PredicateLockManager

Waiting to access predicate lock information used by serializable transactions.

ProcArray

Waiting to access the shared per-process data structures (typically, to get a snapshot or report a session's transaction ID).

RelationMapping

Waiting to read or update a pg_filenode.map file (used to track the filenode assignments of certain system catalogs).

RelCacheInit

Waiting to read or update a pg_internal.init relation cache initialization file.

ReplicationOrigin

Waiting to create, drop or use a replication origin.

ReplicationOriginState

Waiting to read or update the progress of one replication origin.

ReplicationSlotAllocation

Waiting to allocate or free a replication slot.

ReplicationSlotControl

Waiting to read or update replication slot state.

ReplicationSlotIO

Waiting for I/O on a replication slot.

SerialBuffer

Waiting for I/O on a serializable transaction conflict SLRU buffer.

SerialControl

Waiting to read or update shared pg_serial state.

SerializableFinishedList

Waiting to access the list of finished serializable transactions.

SerializablePredicateList

Waiting to access the list of predicate locks held by serializable transactions.

SerializableXactHash

Waiting to read or update information about serializable transactions.

SerialSLRU

Waiting to access the serializable transaction conflict SLRU cache.

SharedTidBitmap

Waiting to access a shared TID bitmap during a parallel bitmap index scan.

SharedTupleStore

Waiting to access a shared tuple store during parallel query.

ShmemIndex

Waiting to find or allocate space in shared memory.

SInvalRead

Waiting to retrieve messages from the shared catalog invalidation queue.

SInvalWrite

Waiting to add a message to the shared catalog invalidation queue.

SubtransBuffer

Waiting for I/O on a sub-transaction SLRU buffer.

SubtransSLRU

Waiting to access the sub-transaction SLRU cache.

SyncRep

Waiting to read or update information about the state of synchronous replication.

SyncScan

Waiting to select the starting location of a synchronized table scan.

TablespaceCreate

Waiting to create or drop a tablespace.

TwoPhaseState

Waiting to read or update the state of prepared transactions.

WaitEventCustom

Waiting to read or update custom wait events information.

WaitLSN

Waiting to read or update shared Wait-for-LSN state.

WALBufMapping

Waiting to replace a page in WAL buffers.

WALInsert

Waiting to insert WAL data into a memory buffer.

WALSummarizer

Waiting to read or update WAL summarization state.

WALWrite

Waiting for WAL buffers to be written to disk.

WrapLimitsVacuum

Waiting to update limits on transaction id and multixact consumption.

XactBuffer

Waiting for I/O on a transaction status SLRU buffer.

XactSLRU

Waiting to access the transaction status SLRU cache.

XactTruncation

Waiting to execute pg_xact_status or update the oldest transaction ID available to it.

XidGen

Waiting to allocate a new transaction ID.

BaseBackupThrottle

Waiting during base backup when throttling activity.

CheckpointWriteDelay

Waiting between writes while performing a checkpoint.

CommitDelay

Waiting for commit delay before WAL flush.

PgSleep

Waiting due to a call to pg_sleep or a sibling function.

RecoveryApplyDelay

Waiting to apply WAL during recovery because of a delay setting.

RecoveryRetrieveRetryInterval

Waiting during recovery when WAL data is not available from any source (pg_wal, archive or stream).

RegisterSyncRequest

Waiting while sending synchronization requests to the checkpointer, because the request queue is full.

SpinDelay

Waiting while acquiring a contended spinlock.

VacuumDelay

Waiting in a cost-based vacuum delay point.

VacuumTruncate

Waiting to acquire an exclusive lock to truncate off any empty pages at the end of a table vacuumed.

WalSummarizerError

Waiting after a WAL summarizer error.

pid integer

Process ID of a WAL sender process

usesysid oid

OID of the user logged into this WAL sender process

usename name

Name of the user logged into this WAL sender process

application_name text

Name of the application that is connected to this WAL sender

client_addr inet

IP address of the client connected to this WAL sender. If this field is null, it indicates that the client is connected via a Unix socket on the server machine.

client_hostname text

Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This field will only be non-null for IP connections, and only when [log_hostname (boolean)

   log_hostname configuration parameter](braised:ref/runtime-config-logging#log-hostname-boolean-log-hostname-configuration-parameter) is enabled.

client_port integer

TCP port number that the client is using for communication with this WAL sender, or -1 if a Unix socket is used

backend_start timestamp with time zone

Time when this process was started, i.e., when the client connected to this WAL sender

backend_xmin xid

This standby's xmin horizon reported by [hot_standby_feedback (boolean)

   hot_standby_feedback configuration parameter](braised:ref/runtime-config-replication#hot-standby-feedback-boolean-hot-standby-feedback-configuration-parameter).

state text

Current WAL sender state. Possible values are:

• startup: This WAL sender is starting up.

• catchup: This WAL sender's connected standby is catching up with the primary.

• streaming: This WAL sender is streaming changes after its connected standby server has caught up with the primary.

• backup: This WAL sender is sending a backup.

• stopping: This WAL sender is stopping. :::{/row}

sent_lsn pg_lsn

Last write-ahead log location sent on this connection

write_lsn pg_lsn

Last write-ahead log location written to disk by this standby server

flush_lsn pg_lsn

Last write-ahead log location flushed to disk by this standby server

replay_lsn pg_lsn

Last write-ahead log location replayed into the database on this standby server

write_lag interval

Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written it (but not yet flushed it or applied it). This can be used to gauge the delay that synchronous_commit level remote_write incurred while committing if this server was configured as a synchronous standby.

flush_lag interval

Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written and flushed it (but not yet applied it). This can be used to gauge the delay that synchronous_commit level on incurred while committing if this server was configured as a synchronous standby.

replay_lag interval

Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written, flushed and applied it. This can be used to gauge the delay that synchronous_commit level remote_apply incurred while committing if this server was configured as a synchronous standby.

sync_priority integer

Priority of this standby server for being chosen as the synchronous standby in a priority-based synchronous replication. This has no effect in a quorum-based synchronous replication.

sync_state text

Synchronous state of this standby server. Possible values are:

• async: This standby server is asynchronous.

• potential: This standby server is now asynchronous, but can potentially become synchronous if one of current synchronous ones fails.

• sync: This standby server is synchronous.

• quorum: This standby server is considered as a candidate for quorum standbys. :::{/row}

reply_time timestamp with time zone

Send time of last reply message received from standby server

slot_name text

A unique, cluster-wide identifier for the replication slot

spill_txns bigint

Number of transactions spilled to disk once the memory used by logical decoding to decode changes from WAL has exceeded logical_decoding_work_mem. The counter gets incremented for both top-level transactions and subtransactions.

spill_count bigint

Number of times transactions were spilled to disk while decoding changes from WAL for this slot. This counter is incremented each time a transaction is spilled, and the same transaction may be spilled multiple times.

spill_bytes bigint

Amount of decoded transaction data spilled to disk while performing decoding of changes from WAL for this slot. This and other spill counters can be used to gauge the I/O which occurred during logical decoding and allow tuning logical_decoding_work_mem.

stream_txns bigint

Number of in-progress transactions streamed to the decoding output plugin after the memory used by logical decoding to decode changes from WAL for this slot has exceeded logical_decoding_work_mem. Streaming only works with top-level transactions (subtransactions can't be streamed independently), so the counter is not incremented for subtransactions.

stream_countbigint

Number of times in-progress transactions were streamed to the decoding output plugin while decoding changes from WAL for this slot. This counter is incremented each time a transaction is streamed, and the same transaction may be streamed multiple times.

stream_bytesbigint

Amount of transaction data decoded for streaming in-progress transactions to the decoding output plugin while decoding changes from WAL for this slot. This and other streaming counters for this slot can be used to tune logical_decoding_work_mem.

total_txns bigint

Number of decoded transactions sent to the decoding output plugin for this slot. This counts top-level transactions only, and is not incremented for subtransactions. Note that this includes the transactions that are streamed and/or spilled.

total_bytesbigint

Amount of transaction data decoded for sending transactions to the decoding output plugin while decoding changes from WAL for this slot. Note that this includes data that is streamed and/or spilled.

stats_reset timestamp with time zone

Time at which these statistics were last reset

pid integer

Process ID of the WAL receiver process

status text

Activity status of the WAL receiver process

receive_start_lsn pg_lsn

First write-ahead log location used when WAL receiver is started

receive_start_tli integer

First timeline number used when WAL receiver is started

written_lsn pg_lsn

Last write-ahead log location already received and written to disk, but not flushed. This should not be used for data integrity checks.

flushed_lsn pg_lsn

Last write-ahead log location already received and flushed to disk, the initial value of this field being the first log location used when WAL receiver is started

received_tli integer

Timeline number of last write-ahead log location received and flushed to disk, the initial value of this field being the timeline number of the first log location used when WAL receiver is started

last_msg_send_time timestamp with time zone

Send time of last message received from origin WAL sender

last_msg_receipt_time timestamp with time zone

Receipt time of last message received from origin WAL sender

latest_end_lsn pg_lsn

Last write-ahead log location reported to origin WAL sender

latest_end_time timestamp with time zone

Time of last write-ahead log location reported to origin WAL sender

slot_name text

Replication slot name used by this WAL receiver

sender_host text

Host of the PostgreSQL instance this WAL receiver is connected to. This can be a host name, an IP address, or a directory path if the connection is via Unix socket. (The path case can be distinguished because it will always be an absolute path, beginning with /.)

sender_port integer

Port number of the PostgreSQL instance this WAL receiver is connected to.

conninfo text

Connection string used by this WAL receiver, with security-sensitive fields obfuscated.

stats_reset timestamp with time zone

Time at which these statistics were last reset

prefetch bigint

Number of blocks prefetched because they were not in the buffer pool

hit bigint

Number of blocks not prefetched because they were already in the buffer pool

skip_init bigint

Number of blocks not prefetched because they would be zero-initialized

skip_new bigint

Number of blocks not prefetched because they didn't exist yet

skip_fpw bigint

Number of blocks not prefetched because a full page image was included in the WAL

skip_rep bigint

Number of blocks not prefetched because they were already recently prefetched

wal_distance int

How many bytes ahead the prefetcher is looking

block_distance int

How many blocks ahead the prefetcher is looking

io_depth int

How many prefetches have been initiated but are not yet known to have completed

subid oid

OID of the subscription

subname name

Name of the subscription

worker_type text

Type of the subscription worker process. Possible types are apply, parallel apply, and table synchronization.

pid integer

Process ID of the subscription worker process

leader_pid integer

Process ID of the leader apply worker if this process is a parallel apply worker; NULL if this process is a leader apply worker or a table synchronization worker

relid oid

OID of the relation that the worker is synchronizing; NULL for the leader apply worker and parallel apply workers

received_lsn pg_lsn

Last write-ahead log location received, the initial value of this field being 0; NULL for parallel apply workers

last_msg_send_time timestamp with time zone

Send time of last message received from origin WAL sender; NULL for parallel apply workers

last_msg_receipt_time timestamp with time zone

Receipt time of last message received from origin WAL sender; NULL for parallel apply workers

latest_end_lsn pg_lsn

Last write-ahead log location reported to origin WAL sender; NULL for parallel apply workers

latest_end_time timestamp with time zone

Time of last write-ahead log location reported to origin WAL sender; NULL for parallel apply workers

subid oid

OID of the subscription

subname name

Name of the subscription

apply_error_count bigint

Number of times an error occurred while applying changes. Note that any conflict resulting in an apply error will be counted in both apply_error_count and the corresponding conflict count (e.g., confl_*).

sync_error_count bigint

Number of times an error occurred during the initial table synchronization

confl_insert_exists bigint

Number of times a row insertion violated a NOT DEFERRABLE unique constraint during the application of changes. See insert_exists for details about this conflict.

confl_update_origin_differs bigint

Number of times an update was applied to a row that had been previously modified by another source during the application of changes. See update_origin_differs for details about this conflict.

confl_update_exists bigint

Number of times that an updated row value violated a NOT DEFERRABLE unique constraint during the application of changes. See update_exists for details about this conflict.

confl_update_missing bigint

Number of times the tuple to be updated was not found during the application of changes. See update_missing for details about this conflict.

confl_delete_origin_differs bigint

Number of times a delete operation was applied to row that had been previously modified by another source during the application of changes. See delete_origin_differs for details about this conflict.

confl_delete_missing bigint

Number of times the tuple to be deleted was not found during the application of changes. See delete_missing for details about this conflict.

confl_multiple_unique_conflicts bigint

Number of times a row insertion or an updated row values violated multiple NOT DEFERRABLE unique constraints during the application of changes. See multiple_unique_conflicts for details about this conflict.

stats_reset timestamp with time zone

Time at which these statistics were last reset

pid integer

Process ID of a backend or WAL sender process

ssl boolean

True if SSL is used on this connection

version text

Version of SSL in use, or NULL if SSL is not in use on this connection

cipher text

Name of SSL cipher in use, or NULL if SSL is not in use on this connection

bits integer

Number of bits in the encryption algorithm used, or NULL if SSL is not used on this connection

client_dn text

Distinguished Name (DN) field from the client certificate used, or NULL if no client certificate was supplied or if SSL is not in use on this connection. This field is truncated if the DN field is longer than NAMEDATALEN (64 characters in a standard build).

client_serial numeric

Serial number of the client certificate, or NULL if no client certificate was supplied or if SSL is not in use on this connection. The combination of certificate serial number and certificate issuer uniquely identifies a certificate (unless the issuer erroneously reuses serial numbers).

issuer_dn text

DN of the issuer of the client certificate, or NULL if no client certificate was supplied or if SSL is not in use on this connection. This field is truncated like client_dn.

pid integer

Process ID of a backend

gss_authenticated boolean

True if GSSAPI authentication was used for this connection

principal text

Principal used to authenticate this connection, or NULL if GSSAPI was not used to authenticate this connection. This field is truncated if the principal is longer than NAMEDATALEN (64 characters in a standard build).

encrypted boolean

True if GSSAPI encryption is in use on this connection

credentials_delegated boolean

True if GSSAPI credentials were delegated on this connection.

archived_count bigint

Number of WAL files that have been successfully archived

last_archived_wal text

Name of the WAL file most recently successfully archived

last_archived_time timestamp with time zone

Time of the most recent successful archive operation

failed_count bigint

Number of failed attempts for archiving WAL files

last_failed_wal text

Name of the WAL file of the most recent failed archival operation

last_failed_time timestamp with time zone

Time of the most recent failed archival operation

stats_reset timestamp with time zone

Time at which these statistics were last reset

backend_type text

Type of backend (e.g. background worker, autovacuum worker). See pg_stat_activity for more information on backend_types. Some backend_types do not accumulate I/O operation statistics and will not be included in the view.

object text

Target object of an I/O operation. Possible values are:

• relation: Permanent relations.

• temp relation: Temporary relations.

• wal: Write Ahead Logs. :::{/row}

context text

The context of an I/O operation. Possible values are:

• normal: The default or standard context for a type of I/O operation. For example, by default, relation data is read into and written out from shared buffers. Thus, reads and writes of relation data to and from shared buffers are tracked in context normal.

• init: I/O operations performed while creating the WAL segments are tracked in context init.

• vacuum: I/O operations performed outside of shared buffers while vacuuming and analyzing permanent relations. Temporary table vacuums use the same local buffer pool as other temporary table I/O operations and are tracked in context normal.

• bulkread: Certain large read I/O operations done outside of shared buffers, for example, a sequential scan of a large table.

• bulkwrite: Certain large write I/O operations done outside of shared buffers, such as COPY. :::{/row}

reads bigint

Number of read operations.

read_bytes numeric

The total size of read operations in bytes.

read_time double precision

Time spent waiting for read operations in milliseconds (if [track_io_timing (boolean)

   track_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-io-timing-boolean-track-io-timing-configuration-parameter) is enabled and `object` is not `wal`, or if [track_wal_io_timing (boolean)
  
   track_wal_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-wal-io-timing-boolean-track-wal-io-timing-configuration-parameter) is enabled and `object` is `wal`, otherwise zero)

writes bigint

Number of write operations.

write_bytes numeric

The total size of write operations in bytes.

write_time double precision

Time spent waiting for write operations in milliseconds (if [track_io_timing (boolean)

   track_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-io-timing-boolean-track-io-timing-configuration-parameter) is enabled and `object` is not `wal`, or if [track_wal_io_timing (boolean)
  
   track_wal_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-wal-io-timing-boolean-track-wal-io-timing-configuration-parameter) is enabled and `object` is `wal`, otherwise zero)

writebacks bigint

Number of units of size BLCKSZ (typically 8kB) which the process requested the kernel write out to permanent storage.

writeback_time double precision

Time spent waiting for writeback operations in milliseconds (if [track_io_timing (boolean)

   track_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-io-timing-boolean-track-io-timing-configuration-parameter) is enabled, otherwise zero). This includes the time spent queueing write-out requests and, potentially, the time spent to write out the dirty data.

extends bigint

Number of relation extend operations.

extend_bytes numeric

The total size of relation extend operations in bytes.

extend_time double precision

Time spent waiting for extend operations in milliseconds. (if [track_io_timing (boolean)

   track_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-io-timing-boolean-track-io-timing-configuration-parameter) is enabled and `object` is not `wal`, or if [track_wal_io_timing (boolean)
  
   track_wal_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-wal-io-timing-boolean-track-wal-io-timing-configuration-parameter) is enabled and `object` is `wal`, otherwise zero)

hits bigint

The number of times a desired block was found in a shared buffer.

evictions bigint

Number of times a block has been written out from a shared or local buffer in order to make it available for another use.

In context normal, this counts the number of times a block was evicted from a buffer and replaced with another block. In contexts bulkwrite, bulkread, and vacuum, this counts the number of times a block was evicted from shared buffers in order to add the shared buffer to a separate, size-limited ring buffer for use in a bulk I/O operation.

reuses bigint

The number of times an existing buffer in a size-limited ring buffer outside of shared buffers was reused as part of an I/O operation in the bulkread, bulkwrite, or vacuum contexts.

fsyncs bigint

Number of fsync calls. These are only tracked in context normal.

fsync_time double precision

Time spent waiting for fsync operations in milliseconds (if [track_io_timing (boolean)

   track_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-io-timing-boolean-track-io-timing-configuration-parameter) is enabled and `object` is not `wal`, or if [track_wal_io_timing (boolean)
  
   track_wal_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-wal-io-timing-boolean-track-wal-io-timing-configuration-parameter) is enabled and `object` is `wal`, otherwise zero)

stats_reset timestamp with time zone

Time at which these statistics were last reset.

buffers_clean bigint

Number of buffers written by the background writer

maxwritten_clean bigint

Number of times the background writer stopped a cleaning scan because it had written too many buffers

buffers_alloc bigint

Number of buffers allocated

stats_reset timestamp with time zone

Time at which these statistics were last reset

num_timed bigint

Number of scheduled checkpoints due to timeout

num_requested bigint

Number of requested checkpoints

num_done bigint

Number of checkpoints that have been performed

restartpoints_timed bigint

Number of scheduled restartpoints due to timeout or after a failed attempt to perform it

restartpoints_req bigint

Number of requested restartpoints

restartpoints_done bigint

Number of restartpoints that have been performed

write_time double precision

Total amount of time that has been spent in the portion of processing checkpoints and restartpoints where files are written to disk, in milliseconds

sync_time double precision

Total amount of time that has been spent in the portion of processing checkpoints and restartpoints where files are synchronized to disk, in milliseconds

buffers_written bigint

Number of shared buffers written during checkpoints and restartpoints

slru_written bigint

Number of SLRU buffers written during checkpoints and restartpoints

stats_reset timestamp with time zone

Time at which these statistics were last reset

wal_records bigint

Total number of WAL records generated

wal_fpi bigint

Total number of WAL full page images generated

wal_bytes numeric

Total amount of WAL generated in bytes

wal_buffers_full bigint

Number of times WAL data was written to disk because WAL buffers became full

stats_reset timestamp with time zone

Time at which these statistics were last reset

datid oid

OID of this database, or 0 for objects belonging to a shared relation

datname name

Name of this database, or NULL for shared objects.

numbackends integer

Number of backends currently connected to this database, or NULL for shared objects. This is the only column in this view that returns a value reflecting current state; all other columns return the accumulated values since the last reset.

xact_commit bigint

Number of transactions in this database that have been committed

xact_rollback bigint

Number of transactions in this database that have been rolled back

blks_read bigint

Number of disk blocks read in this database

blks_hit bigint

Number of times disk blocks were found already in the buffer cache, so that a read was not necessary (this only includes hits in the PostgreSQL buffer cache, not the operating system's file system cache)

tup_returned bigint

Number of live rows fetched by sequential scans and index entries returned by index scans in this database

tup_fetched bigint

Number of live rows fetched by index scans in this database

tup_inserted bigint

Number of rows inserted by queries in this database

tup_updated bigint

Number of rows updated by queries in this database

tup_deleted bigint

Number of rows deleted by queries in this database

conflicts bigint

Number of queries canceled due to conflicts with recovery in this database. (Conflicts occur only on standby servers; see pg_stat_database_conflicts for details.)

temp_files bigint

Number of temporary files created by queries in this database. All temporary files are counted, regardless of why the temporary file was created (e.g., sorting or hashing), and regardless of the [log_temp_files (integer)

   log_temp_files configuration parameter](braised:ref/runtime-config-logging#log-temp-files-integer-log-temp-files-configuration-parameter) setting.

temp_bytes bigint

Total amount of data written to temporary files by queries in this database. All temporary files are counted, regardless of why the temporary file was created, and regardless of the [log_temp_files (integer)

   log_temp_files configuration parameter](braised:ref/runtime-config-logging#log-temp-files-integer-log-temp-files-configuration-parameter) setting.

deadlocks bigint

Number of deadlocks detected in this database

checksum_failures bigint

Number of data page checksum failures detected in this database (or on a shared object), or NULL if data checksums are disabled.

checksum_last_failure timestamp with time zone

Time at which the last data page checksum failure was detected in this database (or on a shared object), or NULL if data checksums are disabled.

blk_read_time double precision

Time spent reading data file blocks by backends in this database, in milliseconds (if [track_io_timing (boolean)

   track_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-io-timing-boolean-track-io-timing-configuration-parameter) is enabled, otherwise zero)

blk_write_time double precision

Time spent writing data file blocks by backends in this database, in milliseconds (if [track_io_timing (boolean)

   track_io_timing configuration parameter](braised:ref/runtime-config-statistics#track-io-timing-boolean-track-io-timing-configuration-parameter) is enabled, otherwise zero)

session_time double precision

Time spent by database sessions in this database, in milliseconds (note that statistics are only updated when the state of a session changes, so if sessions have been idle for a long time, this idle time won't be included)

active_time double precision

Time spent executing SQL statements in this database, in milliseconds (this corresponds to the states active and fastpath function call in pg_stat_activity)

idle_in_transaction_time double precision

Time spent idling while in a transaction in this database, in milliseconds (this corresponds to the states idle in transaction and idle in transaction (aborted) in pg_stat_activity)

sessions bigint

Total number of sessions established to this database

sessions_abandoned bigint

Number of database sessions to this database that were terminated because connection to the client was lost

sessions_fatal bigint

Number of database sessions to this database that were terminated by fatal errors

sessions_killed bigint

Number of database sessions to this database that were terminated by operator intervention

parallel_workers_to_launch bigint

Number of parallel workers planned to be launched by queries on this database

parallel_workers_launched bigint

Number of parallel workers launched by queries on this database

stats_reset timestamp with time zone

Time at which these statistics were last reset

datid oid

OID of a database

datname name

Name of this database

confl_tablespace bigint

Number of queries in this database that have been canceled due to dropped tablespaces

confl_lock bigint

Number of queries in this database that have been canceled due to lock timeouts

confl_snapshot bigint

Number of queries in this database that have been canceled due to old snapshots

confl_bufferpin bigint

Number of queries in this database that have been canceled due to pinned buffers

confl_deadlock bigint

Number of queries in this database that have been canceled due to deadlocks

confl_active_logicalslot bigint

Number of uses of logical slots in this database that have been canceled due to old snapshots or too low a [wal_level (enum)

   wal_level configuration parameter](braised:ref/runtime-config-wal#wal-level-enum-wal-level-configuration-parameter) on the primary

relid oid

OID of a table

schemaname name

Name of the schema that this table is in

relname name

Name of this table

seq_scan bigint

Number of sequential scans initiated on this table

last_seq_scan timestamp with time zone

The time of the last sequential scan on this table, based on the most recent transaction stop time

seq_tup_read bigint

Number of live rows fetched by sequential scans

idx_scan bigint

Number of index scans initiated on this table

last_idx_scan timestamp with time zone

The time of the last index scan on this table, based on the most recent transaction stop time

idx_tup_fetch bigint

Number of live rows fetched by index scans

n_tup_ins bigint

Total number of rows inserted

n_tup_upd bigint

Total number of rows updated. (This includes row updates counted in n_tup_hot_upd and n_tup_newpage_upd, and remaining non-HOT updates.)

n_tup_del bigint

Total number of rows deleted

n_tup_hot_upd bigint

Number of rows HOT updated. These are updates where no successor versions are required in indexes.

n_tup_newpage_upd bigint

Number of rows updated where the successor version goes onto a new heap page, leaving behind an original version with a t_ctid field that points to a different heap page. These are always non-HOT updates.

n_live_tup bigint

Estimated number of live rows

n_dead_tup bigint

Estimated number of dead rows

n_mod_since_analyze bigint

Estimated number of rows modified since this table was last analyzed

n_ins_since_vacuum bigint

Estimated number of rows inserted since this table was last vacuumed (not counting VACUUM FULL)

last_vacuum timestamp with time zone

Last time at which this table was manually vacuumed (not counting VACUUM FULL)

last_autovacuum timestamp with time zone

Last time at which this table was vacuumed by the autovacuum daemon

last_analyze timestamp with time zone

Last time at which this table was manually analyzed

last_autoanalyze timestamp with time zone

Last time at which this table was analyzed by the autovacuum daemon

vacuum_count bigint

Number of times this table has been manually vacuumed (not counting VACUUM FULL)

autovacuum_count bigint

Number of times this table has been vacuumed by the autovacuum daemon

analyze_count bigint

Number of times this table has been manually analyzed

autoanalyze_count bigint

Number of times this table has been analyzed by the autovacuum daemon

total_vacuum_time double precision

Total time this table has been manually vacuumed, in milliseconds (not counting VACUUM FULL). (This includes the time spent sleeping due to cost-based delays.)

total_autovacuum_time double precision

Total time this table has been vacuumed by the autovacuum daemon, in milliseconds. (This includes the time spent sleeping due to cost-based delays.)

total_analyze_time double precision

Total time this table has been manually analyzed, in milliseconds. (This includes the time spent sleeping due to cost-based delays.)

total_autoanalyze_time double precision

Total time this table has been analyzed by the autovacuum daemon, in milliseconds. (This includes the time spent sleeping due to cost-based delays.)

relid oid

OID of the table for this index

indexrelid oid

OID of this index

schemaname name

Name of the schema this index is in

relname name

Name of the table for this index

indexrelname name

Name of this index

idx_scan bigint

Number of index scans initiated on this index

last_idx_scan timestamp with time zone

The time of the last scan on this index, based on the most recent transaction stop time

idx_tup_read bigint

Number of index entries returned by scans on this index

idx_tup_fetch bigint

Number of live table rows fetched by simple index scans using this index

relid oid

OID of a table

schemaname name

Name of the schema that this table is in

relname name

Name of this table

heap_blks_read bigint

Number of disk blocks read from this table

heap_blks_hit bigint

Number of buffer hits in this table

idx_blks_read bigint

Number of disk blocks read from all indexes on this table

idx_blks_hit bigint

Number of buffer hits in all indexes on this table

toast_blks_read bigint

Number of disk blocks read from this table's TOAST table (if any)

toast_blks_hit bigint

Number of buffer hits in this table's TOAST table (if any)

tidx_blks_read bigint

Number of disk blocks read from this table's TOAST table indexes (if any)

tidx_blks_hit bigint

Number of buffer hits in this table's TOAST table indexes (if any)

relid oid

OID of the table for this index

indexrelid oid

OID of this index

schemaname name

Name of the schema this index is in

relname name

Name of the table for this index

indexrelname name

Name of this index

idx_blks_read bigint

Number of disk blocks read from this index

idx_blks_hit bigint

Number of buffer hits in this index

relid oid

OID of a sequence

schemaname name

Name of the schema this sequence is in

relname name

Name of this sequence

blks_read bigint

Number of disk blocks read from this sequence

blks_hit bigint

Number of buffer hits in this sequence

funcid oid

OID of a function

schemaname name

Name of the schema this function is in

funcname name

Name of this function

calls bigint

Number of times this function has been called

total_time double precision

Total time spent in this function and all other functions called by it, in milliseconds

self_time double precision

Total time spent in this function itself, not including other functions called by it, in milliseconds

name text

Name of the SLRU

blks_zeroed bigint

Number of blocks zeroed during initializations

blks_hit bigint

Number of times disk blocks were found already in the SLRU, so that a read was not necessary (this only includes hits in the SLRU, not the operating system's file system cache)

blks_read bigint

Number of disk blocks read for this SLRU

blks_written bigint

Number of disk blocks written for this SLRU

blks_exists bigint

Number of blocks checked for existence for this SLRU

flushes bigint

Number of flushes of dirty data for this SLRU

truncates bigint

Number of truncates for this SLRU

stats_reset timestamp with time zone

Time at which these statistics were last reset

pg_backend_pid () integer

Returns the process ID of the server process attached to the current session.

pg_stat_get_backend_io ( integer ) setof record

Returns I/O statistics about the backend with the specified process ID. The output fields are exactly the same as the ones in the pg_stat_io view.

The function does not return I/O statistics for the checkpointer, the background writer, the startup process and the autovacuum launcher as they are already visible in the pg_stat_io view and there is only one of each.

pg_stat_get_activity ( integer ) setof record

Returns a record of information about the backend with the specified process ID, or one record for each active backend in the system if NULL is specified. The fields returned are a subset of those in the pg_stat_activity view.

pg_stat_get_backend_wal ( integer ) record

Returns WAL statistics about the backend with the specified process ID. The output fields are exactly the same as the ones in the pg_stat_wal view.

The function does not return WAL statistics for the checkpointer, the background writer, the startup process and the autovacuum launcher.

pg_stat_get_snapshot_timestamp () timestamp with time zone

Returns the timestamp of the current statistics snapshot, or NULL if no statistics snapshot has been taken. A snapshot is taken the first time cumulative statistics are accessed in a transaction if stats_fetch_consistency is set to snapshot

pg_stat_get_xact_blocks_fetched ( oid ) bigint

Returns the number of block read requests for table or index, in the current transaction. This number minus pg_stat_get_xact_blocks_hit gives the number of kernel read() calls; the number of actual physical reads is usually lower due to kernel-level buffering.

pg_stat_get_xact_blocks_hit ( oid ) bigint

Returns the number of block read requests for table or index, in the current transaction, found in cache (not triggering kernel read() calls).

pg_stat_clear_snapshot () void

Discards the current statistics snapshot or cached information.

pg_stat_reset () void

Resets all statistics counters for the current database to zero.

This function is restricted to superusers by default, but other users can be granted EXECUTE to run the function.

pg_stat_reset_shared ( [ target text DEFAULT NULL ] ) void

Resets some cluster-wide statistics counters to zero, depending on the argument. target can be:

• archiver: Reset all the counters shown in the pg_stat_archiver view.

• bgwriter: Reset all the counters shown in the pg_stat_bgwriter view.

• checkpointer: Reset all the counters shown in the pg_stat_checkpointer view.

• io: Reset all the counters shown in the pg_stat_io view.

• recovery_prefetch: Reset all the counters shown in the pg_stat_recovery_prefetch view.

• slru: Reset all the counters shown in the pg_stat_slru view.

• wal: Reset all the counters shown in the pg_stat_wal view.

• NULL or not specified: All the counters from the views listed above are reset.

This function is restricted to superusers by default, but other users can be granted EXECUTE to run the function.

pg_stat_reset_single_table_counters ( oid ) void

Resets statistics for a single table or index in the current database or shared across all databases in the cluster to zero.

This function is restricted to superusers by default, but other users can be granted EXECUTE to run the function.

pg_stat_reset_backend_stats ( integer ) void

Resets statistics for a single backend with the specified process ID to zero.

This function is restricted to superusers by default, but other users can be granted EXECUTE to run the function.

pg_stat_reset_single_function_counters ( oid ) void

Resets statistics for a single function in the current database to zero.

This function is restricted to superusers by default, but other users can be granted EXECUTE to run the function.

pg_stat_reset_slru ( [ target text DEFAULT NULL ] ) void

Resets statistics to zero for a single SLRU cache, or for all SLRUs in the cluster. If target is NULL or is not specified, all the counters shown in the pg_stat_slru view for all SLRU caches are reset. The argument can be one of commit_timestamp, multixact_member, multixact_offset, notify, serializable, subtransaction, or transaction to reset the counters for only that entry. If the argument is other (or indeed, any unrecognized name), then the counters for all other SLRU caches, such as extension-defined caches, are reset.

This function is restricted to superusers by default, but other users can be granted EXECUTE to run the function.

pg_stat_reset_replication_slot ( text ) void

Resets statistics of the replication slot defined by the argument. If the argument is NULL, resets statistics for all the replication slots.

This function is restricted to superusers by default, but other users can be granted EXECUTE to run the function.

pg_stat_reset_subscription_stats ( oid ) void

Resets statistics for a single subscription shown in the pg_stat_subscription_stats view to zero. If the argument is NULL, reset statistics for all subscriptions.

This function is restricted to superusers by default, but other users can be granted EXECUTE to run the function.

pg_stat_get_backend_activity ( integer ) text

Returns the text of this backend's most recent query.

pg_stat_get_backend_activity_start ( integer ) timestamp with time zone

Returns the time when the backend's most recent query was started.

pg_stat_get_backend_client_addr ( integer ) inet

Returns the IP address of the client connected to this backend.

pg_stat_get_backend_client_port ( integer ) integer

Returns the TCP port number that the client is using for communication.

pg_stat_get_backend_dbid ( integer ) oid

Returns the OID of the database this backend is connected to.

pg_stat_get_backend_idset () setof integer

Returns the set of currently active backend ID numbers.

pg_stat_get_backend_pid ( integer ) integer

Returns the process ID of this backend.

pg_stat_get_backend_start ( integer ) timestamp with time zone

Returns the time when this process was started.

pg_stat_get_backend_subxact ( integer ) record

Returns a record of information about the subtransactions of the backend with the specified ID. The fields returned are subxact_count, which is the number of subtransactions in the backend's subtransaction cache, and subxact_overflow, which indicates whether the backend's subtransaction cache is overflowed or not.

pg_stat_get_backend_userid ( integer ) oid

Returns the OID of the user logged into this backend.

pg_stat_get_backend_wait_event ( integer ) text

Returns the wait event name if this backend is currently waiting, otherwise NULL. See Wait Events of Type through Wait Events of Type .

pg_stat_get_backend_wait_event_type ( integer ) text

Returns the wait event type name if this backend is currently waiting, otherwise NULL. See Wait Event Types for details.

pg_stat_get_backend_xact_start ( integer ) timestamp with time zone

Returns the time when the backend's current transaction was started.