服务端连接 - 数据库代理 V4.2.1

服务端连接

更新时间：2026-07-22 16:51:01

本文介绍服务端连接（Server Session，即 ODP 和 OBServer 节点间的连接）的一些常用操作。

查看服务端连接

目前暂不支持直接通过 ODP 查看服务端连接。可以使用 root 用户登录 OceanBase 数据库的 sys 租户查看集群内的所有 Server，之后直连对应的 OBServer 节点查看连接。

详细的操作和输出介绍可参见《OceanBase 数据库》文档查看租户会话，此处仅简单介绍一种查看方法。

使用 root 用户登录 OceanBase 数据库的 sys 租户查看集群内的所有 Server。

obclient> select * from oceanbase.__all_server;
+----------------------------+----------------------------+------------+----------+----+------+------------+-----------------+--------+-----------------------+--------------------------------------------------------------------------+-----------+--------------------+--------------+----------------+
| gmt_create                 | gmt_modified               | svr_ip     | svr_port | id | zone | inner_port | with_rootserver | status | block_migrate_in_time | build_version                                                            | stop_time | start_service_time | first_sessid | with_partition |
+----------------------------+----------------------------+------------+----------+----+------+------------+-----------------+--------+-----------------------+--------------------------------------------------------------------------+-----------+--------------------+--------------+----------------+
| 2023-02-28 15:45:53.230044 | 2023-02-28 15:46:25.577180 | 10.10.10.1 |     2882 |  3 | z3   |       2881 |               1 | ACTIVE |                     0 | 4.1.0.0_1-703037f0b023c8ffa880258463b25b1735cf27b3(Feb 28 2023 13:21:21) |         0 |   1677570376568330 |            0 |              1 |
| 2023-02-28 15:45:53.197477 | 2023-02-28 15:46:25.534448 | 10.10.10.2 |     2882 |  2 | z2   |       2881 |               0 | ACTIVE |                     0 | 4.1.0.0_1-703037f0b023c8ffa880258463b25b1735cf27b3(Feb 28 2023 13:21:21) |         0 |   1677570376522994 |            0 |              1 |
| 2023-02-28 15:45:53.113870 | 2023-02-28 15:46:25.098607 | 10.10.10.3 |     2882 |  1 | z1   |       2881 |               0 | ACTIVE |                     0 | 4.1.0.0_1-703037f0b023c8ffa880258463b25b1735cf27b3(Feb 28 2023 13:21:21) |         0 |   1677570378084150 |            0 |              1 |
+----------------------------+----------------------------+------------+----------+----+------+------------+-----------------+--------+-----------------------+--------------------------------------------------------------------------+-----------+--------------------+--------------+----------------+
3 rows in set

选择想要查看的 OBServer 节点，直连该 OBServer 节点，以直连 10.10.10.1，SQL 端口为 2881 为例。
```
[admin@test001 ~]$ obclient -h10.10.10.1 -P2881 -uroot@sys -p -Doceanbase -A
```

执行 show processlist; 命令查看当前 OBServer 节点的所有连接。

obclient> show processlist;

输出如下。

+------------+---------+------------------+-----------+---------+------+--------+------------------+
| Id         | User    | Host             | db        | Command | Time | State  | Info             |
+------------+---------+------------------+-----------+---------+------+--------+------------------+
| 3221812197 | root    | 10.10.10.1:48563 | NULL      | Query   |    0 | ACTIVE | show processlist |
| 3222117829 | proxyro | 10.10.10.1:37876 | oceanbase | Sleep   |    6 | SLEEP  | NULL             |
| 3221709618 | root    | 10.10.10.1:51390 | NULL      | Sleep   |  831 | SLEEP  | NULL             |
+------------+---------+------------------+-----------+---------+------+--------+------------------+
3 rows in set

终止服务端连接

您可通过 ODP 终止指定的服务端连接，也可通过直连 OBServer 节点终止服务端连接。

通过 ODP 终止

sys 租户可以通过 KILL PROXYSESSION {cs_id | connection_id} ss_id 语句终止指定的服务端连接，参数说明如下：

cs_id 为 ODP 内部标记的每个 Client 的 id 号，可通过执行 SHOW PROXYSESSION 语句查看，输出中的 Id 即为 cs_id。
connection_id 为整个 OceanBase 数据库标记的每个 Client 的 ID 号。connection_id 可通过 SELECT CONNECTION_ID(); 语句获取
ss_id 为 ODP 内部标记每个 Server 端会话（ Server Session）的 ID 号，可通过执行 SHOW PROXYSESSION ATTRIBUTE 语句获取。

操作步骤如下。

使用 root@sys 用户通过 ODP 连接登录 OceanBase 数据库
```
obclient -h10.10.10.1 -uroot@sys#obdemo -P2883 -p -c -A
```
此处仅为示例，您需根据实际情况进行修改，详细的连接操作指引可参见通过 OBClient 连接 OceanBase 租户（MySQL 模式）。

查看客户端连接，获取 cs_id

SHOW PROXYSESSION;

输出如下，返回结果中的 Id 即为 cs_id。

+----------------------+-------+----------+--------+------+----------------------+------+-------------+-------------------+-------------------+-------+-------+-----------+
| proxy_sessid         | Id    | Cluster  | Tenant | User | Host                 | db   | trans_count | svr_session_count | state             | tid   | pid   | using_ssl |
+----------------------+-------+----------+--------+------+----------------------+------+-------------+-------------------+-------------------+-------+-------+-----------+
| 12402504630519660556 | 64940 | test420  | sys    | root | 100.xx.xx.xx:63882   | NULL |           0 |                 1 | MCS_ACTIVE_READER | 76286 | 76286 |         0 |
+----------------------+-------+----------+--------+------+----------------------+------+------------- +-------------------+-------------------+-------+-------+-----------+
1 row in set

根据获取的 cs_id 获取 ss_id

SHOW PROXYSESSION ATTRIBUTE 64940;

输出如下。

+----------------------------------+----------------------+----------------+
| attribute_name                   | value                | info           |
+----------------------------------+----------------------+----------------+
| proxy_sessid                     | -6044239443189891060 | cs common      |
| cs_id                            | 64940                | cs common      |
| cluster                          | test3233             | cs common      |
| tenant                           | sys                  | cs common      |
| user                             | root                 | cs common      |
| host_ip                          | 100.xx.xx.xx         | cs common      |
| host_port                        | 63882                | cs common      |
| db                               | NULL                 | cs common      |
| total_trans_cnt                  | 0                    | cs common      |
| svr_session_cnt                  | 1                    | cs common      |
| active                           | true                 | cs common      |
| read_state                       | MCS_ACTIVE_READER    | cs common      |
| tid                              | 76286                | cs common      |
| pid                              | 76286                | cs common      |
| idc_name                         |                      | cs common      |
| modified_time                    | 0                    | cs stat        |
| reported_time                    | 0                    | cs stat        |
| hot_sys_var_version              | 0                    | cs var version |
| sys_var_version                  | 2                    | cs var version |
| user_var_version                 | 0                    | cs var version |
| last_insert_id_version           | 0                    | cs var version |
| db_name_version                  | 0                    | cs var version |
| server_ip                        | xx.xx.xx.xx          | last used ss   |
| server_port                      | 2881                 | last used ss   |
| server_sessid                    | 3221579563           | last used ss   |
| ss_id                            | 16                   | last used ss   |
| state                            | MSS_KA_CLIENT_SLAVE  | last used ss   |
| transact_count                   | 2                    | last used ss   |
| server_trans_stat                | 0                    | last used ss   |
| hot_sys_var_version              | 0                    | last used ss   |
| sys_var_version                  | 2                    | last used ss   |
| user_var_version                 | 0                    | last used ss   |
| last_insert_id_version           | 0                    | last used ss   |
| db_name_version                  | 0                    | last used ss   |
| is_checksum_supported            | 1                    | last used ss   |
| is_safe_read_weak_supported      | 0                    | last used ss   |
| is_checksum_switch_supported     | 1                    | last used ss   |
| checksum_switch                  | 1                    | last used ss   |
| enable_extra_ok_packet_for_stats | 1                    | last used ss   |
+----------------------------------+----------------------+----------------+
39 rows in set

终止客户端连接上的服务端连接
```
KILL PROXYSESSION 64940 16;
```

直连 OBServer 节点终止

使用 root 用户登录 OceanBase 数据库的 sys 租户查看集群内的所有 Server。

obclient> select * from oceanbase.__all_server;
+----------------------------+----------------------------+------------+----------+----+------+------------+-----------------+--------+-----------------------+--------------------------------------------------------------------------+-----------+--------------------+--------------+----------------+
| gmt_create                 | gmt_modified               | svr_ip     | svr_port | id | zone | inner_port | with_rootserver | status | block_migrate_in_time | build_version                                                            | stop_time | start_service_time | first_sessid | with_partition |
+----------------------------+----------------------------+------------+----------+----+------+------------+-----------------+--------+-----------------------+--------------------------------------------------------------------------+-----------+--------------------+--------------+----------------+
| 2023-02-28 15:45:53.230044 | 2023-02-28 15:46:25.577180 | 10.10.10.1 |     2882 |  3 | z3   |       2881 |               1 | ACTIVE |                     0 | 4.1.0.0_1-703037f0b023c8ffa880258463b25b1735cf27b3(Feb 28 2023 13:21:21) |         0 |   1677570376568330 |            0 |              1 |
| 2023-02-28 15:45:53.197477 | 2023-02-28 15:46:25.534448 | 10.10.10.2 |     2882 |  2 | z2   |       2881 |               0 | ACTIVE |                     0 | 4.1.0.0_1-703037f0b023c8ffa880258463b25b1735cf27b3(Feb 28 2023 13:21:21) |         0 |   1677570376522994 |            0 |              1 |
| 2023-02-28 15:45:53.113870 | 2023-02-28 15:46:25.098607 | 10.10.10.3 |     2882 |  1 | z1   |       2881 |               0 | ACTIVE |                     0 | 4.1.0.0_1-703037f0b023c8ffa880258463b25b1735cf27b3(Feb 28 2023 13:21:21) |         0 |   1677570378084150 |            0 |              1 |
+----------------------------+----------------------------+------------+----------+----+------+------------+-----------------+--------+-----------------------+--------------------------------------------------------------------------+-----------+--------------------+--------------+----------------+
3 rows in set

直连 OBServer 节点，以直连 10.10.10.1，SQL 端口为 2881 为例。

[admin@test001 ~]$ obclient -h10.10.10.1 -P2881 -uroot@sys -p -Doceanbase -A

执行 show processlist; 命令查看当前 OBServer 节点的所有连接。

obclient> show processlist;

输出如下。

+------------+---------+------------------+-----------+---------+------+--------+------------------+
| Id         | User    | Host             | db        | Command | Time | State  | Info             |
+------------+---------+------------------+-----------+---------+------+--------+------------------+
| 3221812197 | root    | 10.10.10.1:48563 | NULL      | Query   |    0 | ACTIVE | show processlist |
| 3222117829 | proxyro | 10.10.10.1:37876 | oceanbase | Sleep   |    6 | SLEEP  | NULL             |
| 3221709618 | root    | 10.10.10.1:51390 | NULL      | Sleep   |  831 | SLEEP  | NULL             |
+------------+---------+------------------+-----------+---------+------+--------+------------------+
3 rows in set

以终止当前连接（Id 为 3221812197）为例，使用 kill <id> 命令。

obclient> kill 3221812197;
ERROR 2013 (HY000): Lost connection to MySQL server during query