If the current query is the first of its transaction, this column is equal to the query_start column. Waiting for background worker to start up. Waiting for a replication origin to become inactive so it can be dropped. backup: This WAL sender is sending a backup. Waiting in background writer process, hibernating. The pg_stat_user_indexes and pg_stat_sys_indexes views contain the same information, but filtered to only show user and system indexes respectively. ru> Date: 2015-11-19 14:04:28 Message-ID: 20151119170428.490de41d lp [Download RAW message or body] Thank you for the review. It also tracks the total number of rows in each table, and information about . disabled: This state is reported if track_activities is disabled in this backend. Waiting for I/O on a clog (transaction status) buffer. Provide feedback Time when the currently active query was started, or if state is not active, when the last query was started. Waiting for a write while initializing a new WAL file. 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 to write a protocol message to a shared message queue. LWLock- buffer_mapping. pg_stat_reset_single_function_counters ( oid ) void. Waiting to read or update shared notification state. My application is using Postgres as DBMS, the version of Postgres that i'm using is 10.3 with the extension Postgis installed. Name of the user logged into this backend, Name of the application that is connected to this backend. Waiting to associate a data block with a buffer in the buffer pool. Increase the number of wal_buffers available to the database. Waiting in main loop of archiver process. Waiting for a write to a replication slot control file. See, One row per database, showing database-wide statistics about query cancels due to conflict with recovery on standby servers. Waiting in main loop of WAL writer process. 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). So the statistics will show static information as long as you continue the current transaction. Waiting to acquire an exclusive lock to truncate off any empty pages at the end of a table vacuumed. Waiting to elect a Parallel Hash participant to allocate more batches. 39919 LWLock buffer_mapping 5119 Client ClientRead 3116 IO DataFileRead . Postgres Source Code Docs: Locking Overview. Waiting for other Parallel Hash participants to finish hashing the inner relation. Waiting for a write to the relation map file. Number of data page checksum failures detected in this database (or on a shared object), or NULL if data checksums are not enabled. PostgreSQL utilizes lightweight locks (LWLocks) to synchronize and control access to the buffer content. Number of times transactions were spilled to disk while decoding changes from WAL for this slot. Waiting for a serialized historical catalog snapshot to reach durable storage. Waiting to update limits on transaction id and multixact consumption. Waiting for other Parallel Hash participants to finish inserting tuples into new buckets. 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. Waiting for a read from a replication slot control file. The pg_stat_activity view will have one row per server process, showing information related to the current activity of that process. Extensions can add LWLock types to the list shown in Table28.12. Waiting to read or write relation cache initialization file. quorum: This standby server is considered as a candidate for quorum standbys. Priority of this standby server for being chosen as the synchronous standby in a priority-based synchronous replication. Waiting for WAL from a stream at recovery. From the Actions drop-down menu, choose Create Read Replica. PostgreSQL also supports reporting dynamic information about exactly what is going on in the system right now, such as the exact command currently being executed by other server processes, and which other connections exist in the system. Waiting for the relation map file to reach durable storage. This view will only contain information on standby servers, since conflicts do not occur on master servers. Waiting for the group leader to update transaction status at end of a parallel operation. Waiting in main loop of WAL sender process. Thanks for letting us know this page needs work. Returns the OID of the user logged into this backend. The wait_event and state columns are independent. See, One row for each table in the current database, showing statistics about I/O on that specific table. PostgreSQL Entangled in Locks: Attempts to free it - Amit Kapila - Dilip Kumar PGCon 2017 . Alone the requirement of separate fsyncs and everything is pretty bothersome. streaming: This WAL sender is streaming changes after its connected standby server has caught up with the primary. PostgreSQL accesses certain on-disk information via SLRU (simple least-recently-used) caches. Waiting for an elected Parallel Hash participant to allocate more batches. Waiting for logical replication remote server to change state. IO: The server process is waiting for a IO to complete. Prevent sudden database connection spikes by using a connection pool. 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. idle in transaction (aborted): This state is similar to idle in transaction, except one of the statements in the transaction caused an error. For more information on lightweight locks, see Locking Overview. The IO:DataFileRead wait event occurs while data is Time at which these statistics were last reset. If you see anything in the documentation that is not correct, does not match For example, to show the PIDs and current queries of all backends: Table28.35. Waiting in main loop of startup process for WAL to arrive, during streaming recovery. LWLock:BufferIO. Timeout: The server process is waiting for a timeout to expire. Waiting for an elected Parallel Hash participant to allocate the initial hash table. Waiting in main loop of background writer process background worker. Waiting for activity from a child process while executing a. Waiting to read or truncate multixact information. Waiting to access the shared per-process data structures (typically, to get a snapshot or report a session's transaction ID). As soon as the page is read inside the shared buffer pool, the LWLock:BufferIO lock is released. > However, someone with deeper knowledge of page pinning and buffer manager > internals could certainly devise a better solution. streaming: This WAL sender is streaming changes after its connected standby server has caught up with the primary. Every PostgreSQL process collects statistics locally, then updates the shared data at appropriate intervals. Note that this includes data that is streamed and/or spilled. gorthx on Twitter The fields returned are a subset of those in the pg_stat_activity view. finish their input/output (I/O) operations when concurrently trying to access a page. pg_stat_get_backend_pid ( integer ) integer, pg_stat_get_backend_start ( integer ) timestamp with time zone. LWTRANCHE_BUFFER_CONTENT @ LWTRANCHE_BUFFER_CONTENT. Lock: The backend is waiting for a heavyweight lock. Waiting for truncate of mapping data during a logical rewrite. Waiting for WAL to be flushed in WAL sender process. to keep index reordering low and reduces its impact. proc: Waiting to read or update the fast-path lock information. However, current-query information collected by track_activities is always up-to-date. pg_stat_get_backend_client_addr ( integer ) inet. Waiting to elect a Parallel Hash participant to allocate a hash table. See, One row for each backend (including autovacuum worker processes) running, One row for each WAL sender process streaming a base backup, showing current progress. Waiting to access the multixact member SLRU cache. Cumulative statistics are collected in shared memory. Text of this backend's most recent query. Please refer to your browser's Help pages for instructions. Java,java,file,io,buffer,Java,File,Io,Buffer,Java10242^n Using pg_stat_reset() also resets counters that autovacuum uses to determine when to trigger a vacuum or an analyze. 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. This field is truncated like client_dn. Priority of this standby server for being chosen as the synchronous standby in a priority-based synchronous replication. If the standby server has entirely caught up with the sending server and there is no more WAL activity, the most recently measured lag times will continue to be displayed for a short time and then show NULL. sync: This standby server is synchronous. This standby's xmin horizon reported by hot_standby_feedback. Waiting to read or update old snapshot control information. Waiting in main loop of autovacuum launcher process. Since collection of statistics adds some overhead to query execution, the system can be configured to collect or not collect information.

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