mysql+查看connection_如何查看MySQL connection id连接id
每個MySQL連接，都有一個連接ID，可以通過 connection_id()查看。
連接id也可以通過以下方式查看：
show processlist中id列
information_schema.processlist的id列
performance_schema.threads的processlist_id 列
下面通過具體命令查看連接id。
查看連接id:
mysql> select connection_id();
+—————–+
| connection_id() |
+—————–+
| 15 |
+—————–+
1 row in set (0.00 sec)
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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)
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查看數據表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)
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查看數據表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)
————————————————
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