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  • 如何查看MySQL connection id连接id

    每个MySQL连接,都有一个连接ID,可以通过 connection_id()查看。

    连接id也可以通过以下方式查看:

    • show processlist中id列
    • information_schema.processlist的id列
    • performance_schema.threads的processlist_id 列

    下面通过具体命令查看连接id。

    查看连接id:

    mysql> select connection_id();
    +-----------------+
    | connection_id() |
    +-----------------+
    |              15           |
    +-----------------+
    1 row in set (0.00 sec)
    
    

    查看show processlist:

    mysql> show processlist;
    +----+------+-----------------+------+---------+------+----------+------------------+
    | Id | User | Host            | db   | Command | Time | State    | Info             |
    +----+------+-----------------+------+---------+------+----------+------------------+
    |  3 | root | localhost:60989 | cmdb | Sleep   |  318 |          | NULL             |
    |  4 | root | localhost:60990 | cmdb | Sleep   |  318 |          | NULL             |
    | 15 | root | localhost       | NULL | Query   |    0 | starting | show processlist |
    +----+------+-----------------+------+---------+------+----------+------------------+
    3 rows in set (0.00 sec)
    

    查看数据表information_schema.processlist:

    mysql> select * from  information_schema.processlist;
    +----+------+-----------------+------+---------+------+-----------+-----------------------------------------------+
    | ID | USER | HOST            | DB   | COMMAND | TIME | STATE     | INFO                                          |
    +----+------+-----------------+------+---------+------+-----------+-----------------------------------------------+
    |  3 | root | localhost:60989 | cmdb | Sleep   |  157 |           | NULL                                          |
    | 15 | root | localhost       | NULL | Query   |    0 | executing | select * from  INFORMATION_SCHEMA.PROCESSLIST |
    |  4 | root | localhost:60990 | cmdb | Sleep   |  157 |           | NULL                                          |
    +----+------+-----------------+------+---------+------+-----------+-----------------------------------------------+
    3 rows in set (0.00 sec)
    

    查看数据表performance_schema.threads:

    mysql> 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_ibuf_thread           |           NULL |
    |         4 | thread/innodb/io_log_thread            |           NULL |
    |         5 | thread/innodb/io_read_thread           |           NULL |
    |         6 | thread/innodb/io_read_thread           |           NULL |
    |         7 | thread/innodb/io_read_thread           |           NULL |
    |         8 | thread/innodb/io_read_thread           |           NULL |
    |         9 | thread/innodb/io_write_thread          |           NULL |
    |        10 | thread/innodb/io_write_thread          |           NULL |
    |        11 | thread/innodb/io_write_thread          |           NULL |
    |        12 | thread/innodb/io_write_thread          |           NULL |
    |        13 | thread/innodb/page_cleaner_thread      |           NULL |
    |        16 | thread/innodb/srv_lock_timeout_thread  |           NULL |
    |        15 | thread/innodb/srv_error_monitor_thread |           NULL |
    |        17 | thread/innodb/srv_monitor_thread       |           NULL |
    |        18 | thread/innodb/srv_master_thread        |           NULL |
    |        19 | thread/innodb/srv_worker_thread        |           NULL |
    |        20 | thread/innodb/srv_worker_thread        |           NULL |
    |        21 | thread/innodb/srv_purge_thread         |           NULL |
    |        22 | thread/innodb/srv_worker_thread        |           NULL |
    |        23 | thread/innodb/buf_dump_thread          |           NULL |
    |        24 | thread/innodb/dict_stats_thread        |           NULL |
    |        25 | thread/sql/signal_handler              |           NULL |
    |        26 | thread/sql/compress_gtid_table         |              1 |
    |        28 | thread/sql/one_connection              |              3 |
    |        29 | thread/sql/one_connection              |              4 |
    |        40 | thread/sql/one_connection              |             15 |
    +-----------+----------------------------------------+----------------+
    28 rows in set (0.00 sec)
    

    参考

    https://dev.mysql.com/doc/refman/5.7/en/information-functions.html

    https://dev.mysql.com/doc/refman/5.7/en/threads-table.html

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  • 原文地址:https://www.cnblogs.com/lanyangsh/p/11616350.html
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