please use (Some locks have specific names; others are part of a group of locks each with a similar purpose.). ; Ensure that filesystem journaling is turned off for data files and WAL files. 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. Waiting to fill a dynamic shared memory backing file with zeroes. This counts top-level transactions only, and is not incremented for subtransactions. Waiting in main loop of checkpointer process. Waiting for a write to a relation data file. Wait Events of Type BufferPin, Table28.8. Waiting to associate a data block with a buffer in the buffer pool. See Section30.5 for more information about the internal WAL function issue_xlog_fsync. It can also count calls to user-defined functions and the total time spent in each one. The reported lag times are not predictions of how long it will take for the standby to catch up with the sending server assuming the current rate of replay. This field is truncated like client_dn. All temporary files are counted, regardless of why the temporary file was created, and regardless of the log_temp_files setting. The pg_stat_user_functions view will contain one row for each tracked function, showing statistics about executions of that function. might be causing it. Waiting to access the multixact offset SLRU cache. Text of this backend's most recent query. Waiting for background worker to start up. The pg_statio_user_indexes and pg_statio_sys_indexes views contain the same information, but filtered to only show user and system indexes respectively. Waiting to acquire a lock on a non-relation database object. Text of this backend's most recent query. Waiting for data to reach durable storage while creating the data directory lock file. Current overall state of this backend. 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. The pg_statio_ views are primarily useful to determine the effectiveness of the buffer cache. Waiting to acquire a lock on page of a relation. Buffer pin waits can be protracted if another process holds an open cursor which last read data from the buffer in question. Waiting for I/O on a multixact offset buffer. Waiting for background worker to start up. 39919 LWLock buffer_mapping 5119 Client ClientRead 3116 IO DataFileRead . Waiting for data to reach durable storage while assigning WAL sync method. (The path case can be distinguished because it will always be an absolute path, beginning with /.). Table28.34. This facility is independent of the collector process. Waiting for a two phase state file to reach durable storage. @ LWTRANCHE_REPLICATION_SLOT_IO. Logical decoding plugins may optionally emit tracking messages; if they do not, the tracking mechanism will simply display NULL lag. Possible types are. Each buffer header also contains an LWLock, the "buffer content lock", that *does* represent the right to access the data: in the buffer. Waiting to access the list of finished serializable transactions. The pg_stat_activity view will have one row per server process, showing information related to the current activity of that process. Waiting for a write when creating a new WAL segment by copying an existing one. The argument can be bgwriter to reset all the counters shown in the pg_stat_bgwriter view, archiver to reset all the counters shown in the pg_stat_archiver view, wal to reset all the counters shown in the pg_stat_wal view or recovery_prefetch to reset all the counters shown in the pg_stat_recovery_prefetch view. See, OID of the database this backend is connected to, Name of the database this backend is connected to, Name of the user logged into this backend, Name of the application that is connected to this backend. Use partitioned tables (which also have partitioned indexes). Waiting in main loop of WAL sender process. postgres 26 Heap_Insert Another important point is that when a server process is asked to display any of the accumulated statistics, accessed values are cached until the end of its current transaction in the default configuration. idle in transaction: The backend is in a transaction, but is not currently executing a query. Simple test for lock_waits log messages. The parameter track_functions enables tracking of usage of user-defined functions. When a buffer is read from disk (or written to disk), an IO in progress lock is also acquired, which indicates to other processes that the page is being read (or written) they can queue up if they need to do something with this page. The pg_stat_all_indexes view will contain one row for each index in the current database, showing statistics about accesses to that specific index. PostgreSQL 's statistics collector is a subsystem that supports collection and reporting of information about server activity. Waiting for a replication slot control file to reach durable storage. See, One row for each table in the current database, showing statistics about accesses to that specific table. Table28.6. The pg_stat_gssapi view will contain one row per backend, showing information about GSSAPI usage on this connection. Streaming only works with top-level transactions (subtransactions can't be streamed independently), so the counter is not incremented for subtransactions. For an asynchronous standby, the replay_lag column approximates the delay before recent transactions became visible to queries. Additional functions related to statistics collection are listed in Table28.19. Normally, WAL files are archived in order, oldest to newest, but that is not guaranteed, and does not hold under special circumstances like when promoting a standby or after crash recovery. Time when the currently active query was started, or if state is not active, when the last query was started. Waiting to retrieve or remove messages from shared invalidation queue. Number of transactions in this database that have been committed, Number of transactions in this database that have been rolled back, Number of disk blocks read in this database, 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), Number of live rows fetched by sequential scans and index entries returned by index scans in this database, Number of live rows fetched by index scans in this database, Number of rows inserted by queries in this database, Number of rows updated by queries in this database, Number of rows deleted by queries in this database, Number of queries canceled due to conflicts with recovery in this database. Occasionally i noticed that in random interval of times the dbms become slow and get stuck on a few SELECT queries. Waiting for a logical replication remote server to send data for initial table synchronization. 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). Waiting to read or update a process' fast-path lock information. Waiting for a write of logical rewrite mappings. catchup: This WAL sender's connected standby is catching up with the primary. Returns the TCP port number that the client is using for communication. Verify whether you have unused indexes, then remove them. Amount of transaction data decoded for streaming in-progress transactions to the decoding output plugin while decoding changes from WAL for this slot. Waiting to apply WAL during recovery because of a delay setting. Waiting during base backup when throttling activity. pg_stat_get_backend_activity_start ( integer ) timestamp with time zone. The pg_stat_database view will contain one row for each database in the cluster, plus one for shared objects, showing database-wide statistics. PostgreSQL 15.2, 14.7, 13.10, 12.14, and 11.19 Released, 28.2.1. Waiting to elect a Parallel Hash participant to allocate more buckets. See, One row for each sequence in the current database, showing statistics about I/O on that specific sequence. For details such as the functions' names, consult the definitions of the standard views. Waiting to acquire a lock on a page of a relation. If state is active this field shows the currently executing query. It is quite possible that user has registered the tranche in one of the backends (by having allocation in dynamic shared memory) in which case other backends won't have that information, so we display extension for such cases. Waiting to read or update dynamic shared memory state. Waiting to get the start location of a scan on a table for synchronized scans. The per-table and per-index functions take a table or index OID. pg_stat_get_backend_client_port ( integer ) integer. (Conflicts occur only on standby servers; see, Number of temporary files created by queries in this database. Waiting for WAL from a stream at recovery. Waiting for another process to be attached to a shared message queue. See Table28.5 through Table28.13. The pg_statio_ views are primarily useful to determine the effectiveness of the buffer cache. number of buffers needed by the current workload, The size of the shared buffer pool not being well balanced with the number of pages being evicted by other idle in transaction (aborted): This state is similar to idle in transaction, except one of the statements in the transaction caused an error. Waiting for a read during reorder buffer management. Possible values are: catchup: This WAL sender's connected standby is catching up with the primary. Waiting to acquire a speculative insertion lock. wait_event will identify the specific wait point. Waiting for a read of the relation map file. See, Only one row, showing statistics about blocks prefetched during recovery. When using the statistics to monitor collected data, it is important to realize that the information does not update instantaneously. pg_stat_get_backend_wait_event_type ( integer ) text. (To prevent ordinary users from hiding their activity from the administrator, only superusers are allowed to change these parameters with SET.). This standby's xmin horizon reported by hot_standby_feedback. Presently, accesses to tables and indexes in both disk-block and individual-row terms are counted. Buffer pin waits can be protracted if another process holds an open cursor that last read data from the buffer in question. The optimizer also accesses indexes to check for supplied constants whose values are outside the recorded range of the optimizer statistics because the optimizer statistics might be stale. This has no effect in a quorum-based synchronous replication. Waiting to read or update information about serializable transactions. 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. Before PostgreSQL 8.1, all operations of the shared buffer manager itself were protected by a single system-wide lock, the BufMgrLock, which unsurprisingly proved to be a source of contention. Waiting for an elected Parallel Hash participant to decide on future batch growth. Waiting for a barrier event to be processed by all backends. You can split your In such cases, an older set of per-backend statistics access functions can be used; these are shown in Table28.35. The overhead of a file is much more than wasting the remainder of a page. Waiting for any activity when processing replies from WAL receiver in WAL sender process. (See Chapter19 for details about setting configuration parameters.). See Table28.4 for details. disabled: This state is reported if track_activities is disabled in this backend. The easiest way to create a cross-Region replica for Amazon RDS for PostgreSQL is by completing the following steps: On the Amazon RDS console, choose your Amazon RDS for PostgreSQL source instance. OID of the database this backend is connected to, Name of the database this backend is connected to. Waiting for a replication slot to become inactive so it can be dropped. The idx_tup_read and idx_tup_fetch counts can be different even without any use of bitmap scans, because idx_tup_read counts index entries retrieved from the index while idx_tup_fetch counts live rows fetched from the table. Avoid PostgreSQL LWLock:buffer_content locks in Amazon Aurora: Tips and best practices. Waiting to read or update shared notification state. However, current-query information collected by track_activities is always up-to-date. Waiting for a read during recheck of the data directory lock file. Note that this includes data that is streamed and/or spilled. Waiting for an asynchronous prefetch from a relation data file. Waiting for WAL buffers to be written to disk. Waiting to read or truncate multixact information. Superusers and roles with privileges of built-in role pg_read_all_stats (see also Section22.5) can see all the information about all sessions. This and other streaming counters for this slot can be used to tune logical_decoding_work_mem. Waiting a new WAL segment created by copying an existing one to reach durable storage. A process can wait for the data needed from a client ( Client) or another process ( IPC ). See, One row per connection (regular and replication), showing information about SSL used on this connection. The LWLock:BufferIO event occurs when RDS for PostgreSQL or Aurora PostgreSQL is waiting for other processes to finish their I/O operations. pg_stat_get_activity, the underlying function of the pg_stat_activity view, returns a set of records containing all the available information about each backend process. Waiting to setup, drop or use replication origin. Waiting in WAL receiver to receive data from remote server. 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.
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