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21.5.10.42 The ndbinfo threads Table

The threads table provides information about threads running in the NDB kernel.

The following table provides information about the columns in the threads table. For each column, the table shows the name, data type, and a brief description. Additional information can be found in the notes following the table.

Column NameTypeDescription
node_idintegerID of the node where the the thread is running
thr_nointegerThread ID (specific to this node)
thread_namestringThread name (type of thread)
thread_descriptionstringThread (type) description

Sample output from a 2-node example cluster, including thread descriptions, is shown here:

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 receieve 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 receieve and polling for new receives |
+---------+--------+-------------+------------------------------------------------------------------+
8 rows in set (0.01 sec)

This table was added in NDB 7.5.2.


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