Information Schema THREAD_POOL_GROUPS Table
MariaDB starting with 10.5
The Information Schema THREAD_POOL_GROUPS table was introduced in MariaDB 10.5.0.
The table provides information about thread pool groups, and contains the following columns:
| Column | Description |
|---|---|
GROUP_ID | the thread group this row is showing data for |
CONNECTIONS | the number of clients currently connected to this thread group |
THREADS | total number of threads in this group (ACTIVE+STANDBY+LISTENER) |
ACTIVE_THREADS | number of threads currently executing a query |
STANDBY_THREADS | number of threads in reserve that do not currently execute anything |
QUEUE_LENGTH | number of client requests waiting for execution |
HAS_LISTENER | whether there is an active listener thread right now, always 1 if thread_pool_dedicated_listener is ON |
IS_STALLED | whether there's currently an active worker thread in this group that has exceeded thread_pool_stall_limit time |
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 actual queue size in the table will be more exact, since IO requests are immediately dequeued from poll, without delay.
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