在mysql 裏面或操做系統看mysql 的會話狀況

在mysql 交互式會話中查看當前鏈接狀況。
(root@localhost) [(none)]> show processlist;

| Id | User | Host | db | Command | Time | State | Info |

| 4 | root | localhost:52778 | mysql | Sleep | 2 | | NULL |
| 1495 | root | 192.168.154.1:57040 | world | Sleep | 1881 | | NULL |
| 10241 | root | 192.168.154.190:51707 | world | Sleep | 649 | | NULL |
| 12671 | root | localhost | NULL | Query | 0 | init | show processlist |
| 13279 | root | localhost:38329 | mysql | Sleep | 50 | | NULL |
| 13362 | root | localhost:38419 | mem | Sleep | 2 | | NULL |

6 rows in set (0.00 sec)

(root@localhost) [(none)]>

經過查表方式：
(root@localhost) [(none)]> select *from INFORMATION_SCHEMA.PROCESSLIST
-> ;

| ID | USER | HOST | DB | COMMAND | TIME | STATE | INFO |

| 4 | root | localhost:52778 | mysql | Sleep | 11 | | NULL |
| 1495 | root | 192.168.154.1:57040 | world | Sleep | 2100 | | NULL |
| 12671 | root | localhost | NULL | Query | 0 | executing | select *from INFORMATION_SCHEMA.PROCESSLIST |
| 13708 | root | localhost:38782 | mem | Sleep | 10 | | NULL |
| 13675 | root | localhost:38746 | mem | Sleep | 11 | | NULL |
| 13707 | root | localhost:38781 | mem | Sleep | 8 | | NULL |
| 13279 | root | localhost:38329 | mysql | Sleep | 29 | | NULL |
| 10241 | root | 192.168.154.190:51707 | world | Sleep | 868 | | NULL |

8 rows in set (0.00 sec)

(root@localhost) [(none)]>

當前本身的會話信息：
(root@192.168.154.190) [world]> select connection_id 
-> ;
++
| connection_id |
++
| 10241 |
++
1 row in set (0.02 sec)

(root@192.168.154.190) [world]>

而後殺死這個會話。
mysql>kill 10241
則這個會話出錯。
(root@192.168.154.190) [world]> select connection_id
-> ;
ERROR 2013 (HY000): Lost connection to MySQL server during query
(root@192.168.154.190) [world]>

顯示當前全部的鏈接會話（包括系統的）
(root@192.168.154.190) [world]> SHOW FULL PROCESSLIST
-> ;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 14556
Current database: world

| Id | User | Host | db | Command | Time | State | Info |

| 4 | root | localhost:52778 | mysql | Sleep | 9 | | NULL |
| 1495 | root | 192.168.154.1:57040 | world | Sleep | 2622 | | NULL |
| 12671 | root | localhost | NULL | Sleep | 71 | | NULL |
| 14228 | root | localhost:39316 | mysql | Sleep | 11 | | NULL |
| 14499 | root | localhost:39600 | mem | Sleep | 10 | | NULL |
| 14511 | root | localhost:39612 | mem | Sleep | 10 | | NULL |
| 14512 | root | localhost:39613 | mem | Sleep | 11 | | NULL |
| 14513 | root | localhost:39614 | mem | Sleep | 10 | | NULL |
| 14514 | root | localhost:39615 | mem | Sleep | 9 | | NULL |
| 14515 | root | localhost:39617 | mem | Sleep | 10 | | NULL |
| 14516 | root | localhost:39616 | mem | Sleep | 10 | | NULL |
| 14517 | root | localhost:39619 | mem | Sleep | 10 | | NULL |
| 14518 | root | localhost:39620 | mem | Sleep | 9 | | NULL |
| 14519 | root | localhost:39621 | mem | Sleep | 10 | | NULL |
| 14520 | root | localhost:39622 | mem | Sleep | 9 | | NULL |
| 14521 | root | localhost:39623 | mem | Sleep | 9 | | NULL |
| 14522 | root | localhost:39624 | mem | Sleep | 10 | | NULL |
| 14523 | root | localhost:39625 | mem | Sleep | 9 | | NULL |
| 14524 | root | localhost:39627 | mem | Sleep | 9 | | NULL |
| 14525 | root | localhost:39626 | mem | Sleep | 9 | | NULL |
| 14526 | root | localhost:39630 | mem | Sleep | 10 | | NULL |
| 14527 | root | localhost:39629 | mem | Sleep | 9 | | NULL |
| 14528 | root | localhost:39632 | mem | Sleep | 10 | | NULL |
| 14529 | root | localhost:39633 | mem | Sleep | 10 | | NULL |
| 14530 | root | localhost:39634 | mem | Sleep | 9 | | NULL |
| 14531 | root | localhost:39637 | mem | Sleep | 9 | | NULL |
| 14532 | root | localhost:39636 | mem | Sleep | 10 | | NULL |
| 14533 | root | localhost:39639 | mem | Sleep | 10 | | NULL |
| 14534 | root | localhost:39640 | mem | Sleep | 10 | | NULL |
| 14535 | root | localhost:39642 | mem | Sleep | 10 | | NULL |
| 14536 | root | localhost:39643 | mem | Sleep | 10 | | NULL |
| 14537 | root | localhost:39644 | mem | Sleep | 10 | | NULL |
| 14538 | root | localhost:39645 | mem | Sleep | 10 | | NULL |
| 14539 | root | localhost:39646 | mem | Sleep | 9 | | NULL |
| 14540 | root | localhost:39647 | mem | Sleep | 10 | | NULL |
| 14541 | root | localhost:39649 | mem | Sleep | 10 | | NULL |
| 14542 | root | localhost:39650 | mem | Sleep | 9 | | NULL |
| 14543 | root | localhost:39651 | mem | Sleep | 9 | | NULL |
| 14545 | root | localhost:39653 | mem | Sleep | 10 | | NULL |
| 14556 | root | 192.168.154.190:56159 | world | Query | 0 | init | SHOW FULL PROCESSLIST |

40 rows in set (0.04 sec)