Waiting to read or update shared multixact state. See, One row per subscription, showing statistics about errors. The server process is idle. When the number of actual disk reads is much smaller than the number of buffer hits, then the cache is satisfying most read requests without invoking a kernel call. Waiting in main loop of the statistics collector process. Waiting for an elected Parallel Hash participant to allocate the initial hash table. Waiting for changes to a relation data file to reach durable storage. Distinguished Name (DN) field from the client certificate used, or NULL if no client certificate was supplied or if SSL is not in use on this connection. Waiting between writes while performing a checkpoint. In particular, when the standby has caught up completely, pg_stat_replication shows the time taken to write, flush and replay the most recent reported WAL location rather than zero as some users might expect. Time when this process' current transaction was started, or null if no transaction is active. Waiting for another process to be attached to a shared message queue. to keep index reordering low and reduces its impact. Waiting for an asynchronous prefetch from a relation data file. Waiting to synchronize workers during Parallel Hash Join plan execution. Returns a record of information about the backend with the specified process ID, or one record for each active backend in the system if NULL is specified. Waiting to acquire a speculative insertion lock. Waiting for a read during recheck of the data directory lock file. Waiting to retrieve messages from the shared catalog invalidation queue. idle in transaction: The backend is in a transaction, but is not currently executing a query. 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 view will only contain information on standby servers, since conflicts do not occur on master servers. The new locking scheme avoids grabbing system-wide exclusive locks in common code paths.
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