Information Schema THREAD_POOL_QUEUES Table
MariaDB starting with 10.5
The table provides information about thread pool queues, and contains the following columns:
|the thread group this row is showing data for|
|position in the groups queue|
|request priority, see priority scheduling|
|ID of the client connection that submitted the queued request|
|how long the request has already been waiting in the queue in microseconds|
Setting thread_poll_exact_stats will provides better queueing time statistics by using a high precision timestamp, at a small performance cost, for the time when the connection was added to the queue. This timestamp helps calculate the queuing time shown in the table.
Setting thread_pool_dedicated_listener will give each group its own dedicated listener, and the listener thread will not pick up work items. As a result, the queueing time in the table will be more exact, since IO requests are immediately dequeued from poll, without delay.