threads 表提供了有关在 NDB 内核中运行的线程的信息。

threads 表包含以下列

注释

这里显示了来自包含线程描述的 2 节点示例集群的示例输出

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 main 或 rep 设置为 0，同时将另一个参数保留为 1，在这种情况下，线程名称为 main_rep，其描述为 main and rep thread, schema, distribution, proxy block and asynch replication handling。您也可以将 main 和 rep 都设置为 0，在这种情况下，结果线程的名称在此表中显示为 main_rep_recv，其描述为 main, rep and recv thread, schema, distribution, proxy block and asynch replication handling and handling receive and polling for new receives。