Linux 查看MySQL 线程id
ps -T -p <进程号>
查看MySQL的线程,证实了MySQL是一个单进程，多线程的服务
➜ bob@bob-pc ~ ps -T -p 101740
PID SPID TTY TIME CMD
101740 101740 ? 00:00:01 mysqld
101740 101745 ? 00:00:00 mysqld
101740 101748 ? 00:00:02 mysqld
101740 101749 ? 00:00:02 mysqld
101740 101750 ? 00:00:02 mysqld
101740 101751 ? 00:00:02 mysqld
101740 101752 ? 00:00:02 mysqld
101740 101753 ? 00:00:02 mysqld
101740 101754 ? 00:00:02 mysqld
101740 101755 ? 00:00:02 mysqld
101740 101756 ? 00:00:02 mysqld
101740 101757 ? 00:00:02 mysqld
101740 101758 ? 00:00:02 mysqld
101740 101906 ? 00:00:01 mysqld
101740 101907 ? 00:00:04 mysqld
101740 101908 ? 00:00:00 mysqld
101740 101909 ? 00:00:02 mysqld
101740 101910 ? 00:00:01 mysqld
101740 101911 ? 00:00:00 mysqld
101740 101912 ? 00:00:00 mysqld
101740 101913 ? 00:00:00 mysqld
101740 101914 ? 00:00:00 mysqld
101740 101915 ? 00:00:00 mysqld
101740 101916 ? 00:00:00 mysqld
101740 101917 ? 00:00:00 mysqld
101740 101951 ? 00:00:00 mysqld
101740 101952 ? 00:00:00 mysqld
101740 103734 ? 00:00:00 mysqld
101740 2030593 ? 00:00:00 mysqld
101740 2030596 ? 00:00:00 mysqld
101740 2030597 ? 00:00:00 mysqld
101740 2076782 ? 00:00:00 mysqld
101740 2076788 ? 00:00:00 mysqld
101740 2076793 ? 00:00:00 mysqld
101740 2076997 ? 00:00:00 mysqld
101740 2076999 ? 00:00:00 mysqld
101740 2077001 ? 00:00:00 mysqld
101740 2077005 ? 00:00:00 mysqld
101740 2077006 ? 00:00:00 mysqld
101740 2077009 ? 00:00:00 mysqld
101740 2077070 ? 00:00:00 mysqld
101740 2077072 ? 00:00:00 mysqld
101740 2077075 ? 00:00:00 mysqld
101740 2077076 ? 00:00:00 mysqld
MySQL的线程可以和表里面对应上，在MySQL5.7 performance_schema库threads 里面,可以得到以下的信息
select THREAD_ID,NAME ,PROCESSLIST_ID from performance_schema.threads;
+-----------+----------------------------------------+----------------+
| THREAD_ID | NAME | PROCESSLIST_ID |
+-----------+----------------------------------------+----------------+
| 1 | thread/sql/main | NULL |
| 2 | thread/sql/thread_timer_notifier | NULL |
| 3 | thread/innodb/io_log_thread | NULL |
| 4 | thread/innodb/io_read_thread | NULL |
| 5 | thread/innodb/io_read_thread | NULL |
| 6 | thread/innodb/io_read_thread | NULL |
| 7 | thread/innodb/io_ibuf_thread | NULL |
| 8 | thread/innodb/io_read_thread | NULL |
| 9 | thread/innodb/io_write_thread | NULL |
| 10 | thread/innodb/page_cleaner_thread | NULL |
| 11 | thread/innodb/io_write_thread | NULL |
| 12 | thread/innodb/io_write_thread | NULL |
| 13 | thread/innodb/io_write_thread | NULL |
| 16 | thread/innodb/srv_lock_timeout_thread | NULL |
| 17 | thread/innodb/srv_error_monitor_thread | NULL |
| 18 | thread/innodb/srv_monitor_thread | NULL |
| 19 | thread/innodb/srv_purge_thread | NULL |
| 20 | thread/innodb/srv_worker_thread | NULL |
| 21 | thread/innodb/srv_worker_thread | NULL |
| 22 | thread/innodb/srv_worker_thread | NULL |
| 23 | thread/innodb/srv_master_thread | NULL |
| 24 | thread/innodb/dict_stats_thread | NULL |
| 25 | thread/innodb/buf_dump_thread | NULL |
| 26 | thread/sql/signal_handler | NULL |
| 27 | thread/sql/compress_gtid_table | 1 |
| 5045 | thread/sql/one_connection | 5019 |
| 5046 | thread/sql/one_connection | 5020 |
| 39 | thread/sql/one_connection | 13 |
| 2042 | thread/sql/one_connection | 2016 |
| 2043 | thread/sql/one_connection | 2017 |
| 2044 | thread/sql/one_connection | 2018 |
+-----------+----------------------------------------+----------------+