threads 表提供了关于运行在 NDB 内核中的线程的信息。

threads 表包含以下列:

以下是一个 2 个节点的示例集群，包括线程描述的样本输出：

mysql> SELECT * FROM threads;
+---------+--------+-------------+------------------------------------------------------------------+
| node_id | thr_no | thread_name | thread_description                                               |
+---------+--------+-------------+------------------------------------------------------------------+
|       5 |      0 | main        | main thread, schema and distribution handling                    |
|       5 |      1 | rep         | rep thread, asynch replication and proxy block handling          |
|       5 |      2 | ldm         | ldm thread, handling a set of data partitions                    |
|       5 |      3 | recv        | receive thread, performing receive and polling for new receives  |
|       6 |      0 | main        | main thread, schema and distribution handling                    |
|       6 |      1 | rep         | rep thread, asynch replication and proxy block handling          |
|       6 |      2 | ldm         | ldm thread, handling a set of data partitions                    |
|       6 |      3 | recv        | receive thread, performing receive and polling for new receives  |
+---------+--------+-------------+------------------------------------------------------------------+
8 rows in set (0.01 sec)

还可以将 ThreadConfig 参数中的 main 或 rep 设置为 0，而将另一个设置为 1，在这种情况下，线程名称是 main_rep，其描述是 主和副本线程，chema 分布代理块和异步复制处理。您也可以将 main 和 rep 都设置为 0，在这种情况下，线程名称在该表中显示为 main_rep_recv，其描述是 主、副本和接收线程，chema 分布代理块和异步复制处理和处理新接收和轮询。