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Waiting to add a message to the shared catalog invalidation queue. All temporary files are counted, regardless of why the temporary file was created, and regardless of the, Number of deadlocks detected in this database, Time spent reading data file blocks by backends in this database, in milliseconds, Time spent writing data file blocks by backends in this database, in milliseconds, Number of queries in this database that have been canceled due to dropped tablespaces, Number of queries in this database that have been canceled due to lock timeouts, Number of queries in this database that have been canceled due to old snapshots, Number of queries in this database that have been canceled due to pinned buffers, Number of queries in this database that have been canceled due to deadlocks, Number of sequential scans initiated on this table, Number of live rows fetched by sequential scans, Number of index scans initiated on this table, Number of live rows fetched by index scans, Number of rows updated (includes HOT updated rows), Number of rows HOT updated (i.e., with no separate index update required), Estimated number of rows modified since this table was last analyzed, Last time at which this table was manually vacuumed (not counting, Last time at which this table was vacuumed by the autovacuum daemon, Last time at which this table was manually analyzed, Last time at which this table was analyzed by the autovacuum daemon, Number of times this table has been manually vacuumed (not counting, Number of times this table has been vacuumed by the autovacuum daemon, Number of times this table has been manually analyzed, Number of times this table has been analyzed by the autovacuum daemon, Number of index scans initiated on this index, Number of index entries returned by scans on this index, Number of live table rows fetched by simple index scans using this index, Number of disk blocks read from this table, Number of disk blocks read from all indexes on this table, Number of buffer hits in all indexes on this table, Number of disk blocks read from this table's TOAST table (if any), Number of buffer hits in this table's TOAST table (if any), Number of disk blocks read from this table's TOAST table indexes (if any), Number of buffer hits in this table's TOAST table indexes (if any), Number of disk blocks read from this index, Number of disk blocks read from this sequence, Number of times this function has been called, Total time spent in this function and all other functions called by it, in milliseconds, Total time spent in this function itself, not including other functions called by it, in milliseconds, Process ID of the server process handling the current session, Returns a record of information about the backend with the specified PID, or one record for each active backend in the system if, Returns the timestamp of the current statistics snapshot, Reset all statistics counters for the current database to zero (requires superuser privileges by default, but EXECUTE for this function can be granted to others. Waiting for WAL to reach durable storage during bootstrapping. Waiting in WAL receiver to establish connection to remote server. Waiting for I/O on a clog (transaction status) buffer. Waiting to read or update a process' fast-path lock information. Waiting for a write while initializing a new WAL file. Waiting for I/O on a multixact offset buffer. Table28.19.pg_stat_subscription_stats View, Number of times an error occurred while applying changes, Number of times an error occurred during the initial table synchronization. See, One row for each index in the current database, showing statistics about accesses to that specific index. Waiting for a read from a relation data file. wait_event will contain a name identifying the purpose of the lightweight lock. Waiting for changes to a relation data file to reach durable storage. Last write-ahead log location already received and written to disk, but not flushed. Waiting to elect a Parallel Hash participant to decide on future batch growth. Note, however, that the existence of a session and its general properties such as its sessions user and database are visible to all users. The parameter track_counts controls whether cumulative statistics are collected about table and index accesses. Waiting for parallel workers to finish computing. I'd like to know more about what these locks could imply if anything. Waiting for any activity when processing replies from WAL receiver in WAL sender process. See. However, they are also used to ensure mutual exclusion for certain internal operations such as relation extension. Name of the user logged into this backend, Name of the application that is connected to this backend. Possible values are: Last write-ahead log location sent on this connection, Last write-ahead log location written to disk by this standby server, Last write-ahead log location flushed to disk by this standby server, Last write-ahead log location replayed into the database on this standby server, 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). wait_event will identify the type of lock awaited. LWTRANCHE_BUFFER_CONTENT @ LWTRANCHE_BUFFER_CONTENT. (For example, in psql you could issue \d+ pg_stat_activity.) Number of times this function has been called, Total time spent in this function and all other functions called by it, in milliseconds, Total time spent in this function itself, not including other functions called by it, in milliseconds. Amount of transaction data decoded for streaming in-progress transactions to the decoding output plugin while decoding changes from WAL for this slot. Waiting for the version file to be written while creating a database. The pg_statio_ views are primarily useful to determine the effectiveness of the buffer cache. ; Ensure that filesystem journaling is turned off for data files and WAL files. Resets statistics for a single function in the current database to zero. See, Only one row, showing statistics about blocks prefetched during recovery. Waiting to manage space allocation in shared memory. Time when this process' current transaction was started, or null if no transaction is active. Priority of this standby server for being chosen as the synchronous standby in a priority-based synchronous replication. It can be joined to pg_stat_activity or pg_stat_replication on the pid column to get more details about the connection. If you've got a moment, please tell us how we can make the documentation better. Waiting to read or update the last value set for a transaction commit timestamp. Send time of last reply message received from standby server. If state is active this field shows the currently executing query. Timeout: The server process is waiting for a timeout to expire. Indexes can be used by simple index scans, bitmap index scans, and the optimizer. See, One row per replication slot, showing statistics about the replication slot's usage. Resets some cluster-wide statistics counters to zero, depending on the argument. Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written, flushed and applied it. For more information, see LWLock:buffer_content (BufferContent). OID of the user logged into this WAL sender process, Name of the user logged into this WAL sender process, Name of the application that is connected to this WAL sender. If the state is active and wait_event is non-null, it means that a query is being executed, but is being blocked somewhere in the system. Waiting for base backup to read from a file. Waiting to access the sub-transaction SLRU cache. But access to that shared memory requires the protection of light-weight locks, which should last for only nanoseconds or microseconds while the memory access is actually occuring. pg_blocking_pids function. PostgreSQL's cumulative statistics system supports collection and reporting of information about server activity. your workload peak time if you see LWLock:BufferIO coinciding with The counter gets incremented for both top-level transactions and subtransactions. A snapshot is taken the first time cumulative statistics are accessed in a transaction if stats_fetch_consistency is set to snapshot. These times represent the commit delay that was (or would have been) introduced by each synchronous commit level, if the remote server was configured as a synchronous standby. Waiting for mapping data to reach durable storage during a logical rewrite. This field will only be non-null for IP connections, and only when log_hostname is enabled. Possible values are: Activity status of the WAL receiver process, First write-ahead log location used when WAL receiver is started, First timeline number used when WAL receiver is started, 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, 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, Send time of last message received from origin WAL sender, Receipt time of last message received from origin WAL sender, Last write-ahead log location reported to origin WAL sender, Time of last write-ahead log location reported to origin WAL sender, Replication slot name used by this WAL receiver. Doing this helps The pg_statio_all_indexes view will contain one row for each index in the current database, showing statistics about I/O on that specific index. For example, to show the PIDs and current queries of all backends: Table28.20. Waiting to access the multixact member SLRU cache. Waiting for a read during recheck of the data directory lock file. quorum: This standby server is considered as a candidate for quorum standbys. Since collection of statistics adds some overhead to query execution, the system can be configured to collect or not collect information. Waiting for parallel query dynamic shared memory allocation lock. See Section30.5 for more information about the internal WAL function XLogWrite. Waiting for a write while adding a line to the data directory lock file. pg_stat_reset_subscription_stats ( oid ) void. (Conflicts occur only on standby servers; see, Number of temporary files created by queries in this database. Autovacuum worker or launcher waiting to update or read the current state of autovacuum workers. Some of the information in the dynamic statistics views shown in Table28.1 is security restricted. See, Time when the current transaction was started. Waiting for SSL while attempting connection. Principal used to authenticate this connection, or NULL if GSSAPI was not used to authenticate this connection. The pg_stat_ssl view will contain one row per backend or WAL sender process, showing statistics about SSL usage on this connection.