Waiting for mapping data to reach durable storage during a logical rewrite. The parameter track_functions enables tracking of usage of user-defined functions. There are also several other views, listed in Table28.2, available to show the accumulated statistics. Waiting to update limits on transaction id and multixact consumption. replication_slot_io: Waiting for I/O on a replication slot. These access functions use a backend ID number, which ranges from one to the number of currently active backends. Wait Events of Type BufferPin, Table28.8. Table28.17.pg_stat_recovery_prefetch View, Number of blocks prefetched because they were not in the buffer pool, Number of blocks not prefetched because they were already in the buffer pool, Number of blocks not prefetched because they would be zero-initialized, Number of blocks not prefetched because they didn't exist yet, Number of blocks not prefetched because a full page image was included in the WAL, Number of blocks not prefetched because they were already recently prefetched, How many bytes ahead the prefetcher is looking, How many blocks ahead the prefetcher is looking, How many prefetches have been initiated but are not yet known to have completed, Process ID of the subscription worker process, OID of the relation that the worker is synchronizing; null for the main apply worker, Last write-ahead log location received, the initial value of this field being 0. In order to write the disk block into buffer memory, the buffer cache's hash table entry needs updating. Number of data page checksum failures detected in this database (or on a shared object), or NULL if data checksums are not enabled. Waiting for WAL to reach durable storage during bootstrapping. See, One row for each sequence in the current database, showing statistics about I/O on that specific sequence. Normally these parameters are set in postgresql.conf so that they apply to all server processes, but it is possible to turn them on or off in individual sessions using the SET command. (See Chapter20 for details about setting configuration parameters.). Waiting for a write of logical rewrite mappings. Waiting for a read of the relation map file. Waiting for a write of mapping data during a logical rewrite. Time when this process' current transaction was started, or null if no transaction is active. The per-table and per-index functions take a table or index OID. 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. Waiting for a two phase state file to reach durable storage. You can split your Waiting for a read during a file copy operation. Waiting for logical replication remote server to change state. Therefore, a bitmap scan increments the pg_stat_all_indexes.idx_tup_read count(s) for the index(es) it uses, and it increments the pg_stat_all_tables.idx_tup_fetch count for the table, but it does not affect pg_stat_all_indexes.idx_tup_fetch.

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