MySQL 5.7 Reference Manual
MySQL 5.7 Release Notes
The threads
table provides information about
threads running in the NDB
kernel.
The threads
table contains the following
columns:
node_id
ID of the node where the thread is running
thr_no
Thread ID (specific to this node)
thread_name
Thread name (type of thread)
thread_description
Thread (type) description
Notes
Sample output from a 2-node example cluster, including thread descriptions, is shown here:
Press CTRL+C to copymysql> 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)
This table was added in NDB 7.5.2.