Information Schema THREADPOOL_QUEUES Table

MariaDB starting with 10.5

The Information Schema THREADPOOL_QUEUES table was introduced in MariaDB 10.5.0.

It contains the following columns:

ColumnDescription
POSITION
PRIORITY
CONNECTION_ID
QUEUEING_TIME_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.

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