If the argument is NULL, resets statistics for all the replication slots. Waiting for a read while adding a line to the data directory lock file. See, One row per connection (regular and replication), showing information about GSSAPI authentication and encryption used on this connection. To minimize skew, stats_fetch_consistency can be set to snapshot, at the price of increased memory usage for caching not-needed statistics data. There have been several occasions when a query is being executed dozens of times simultaneously by one or many users. Waiting for a read from a replication slot control file. From the Actions drop-down menu, choose Create Read Replica. Principal used to authenticate this connection, or NULL if GSSAPI was not used to authenticate this connection. In rows about other sessions, many columns will be null. Extensions can add LWLock types to the list shown in Table28.12. Several predefined views, listed in Table28.1, are available to show the current state of the system. Several predefined views, listed in Table28.1, are available to show the current state of the system. Waiting for a logical replication remote server to change state. Number of temporary files created by queries in this database. Other ways of looking at the statistics can be set up by writing queries that use the same underlying statistics access functions used by the standard views shown above. Indexes can be used by simple index scans, bitmap index scans, and the optimizer. (For example, in psql you could issue \d+ pg_stat_activity.) Note that this includes data that is streamed and/or spilled. The pg_stat_subscription view will contain one row per subscription for main worker (with null PID if the worker is not running), and additional rows for workers handling the initial data copy of the subscribed tables. TCP port number that the client is using for communication with this WAL sender, or -1 if a Unix socket is used, Time when this process was started, i.e., when the client connected to this WAL sender. Java,java,file,io,buffer,Java,File,Io,Buffer,Java10242^n Thus, the server expects something to happen that is independent of its internal processes. The LWLock:BufferIO event occurs when RDS for PostgreSQL or Aurora PostgreSQL is waiting for other processes to finish their I/O operations. > However, someone with deeper knowledge of page pinning and buffer manager > internals could certainly devise a better solution. The new locking scheme avoids grabbing system-wide exclusive locks in common code paths. Waiting to elect a Parallel Hash participant to allocate a hash table. * The BM_IO_IN_PROGRESS flag acts as a kind of lock, used to wait for I/O on a: buffer to complete (and in releases before 14, it was accompanied by a: per-buffer LWLock). Waiting for a newly created timeline history file to reach durable storage. The parameter track_functions enables tracking of usage of user-defined functions. 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, 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, 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, Host of the PostgreSQL instance this WAL receiver is connected to.
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