以 2C 的机器为例，不同配置下机器上的 OBServer 的 CPU 上限：
--连接集群
obclient -h192.168.40.110 -P2881 -uroot@sys -p'61608Hhd820.' -Doceanbase -A
--修改前查看参数： scope 列对应的值为 CLUSTER 表示该配置项为集群级别；如果 scope 列对应的值为 TENANT，则表示该配置项为租户级别。
obclient(root@sys)[oceanbase]> show parameters like 'cpu_count';
+-------+----------+----------------+----------+-----------+-----------+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+---------+---------+-------------------+---------------+-----------+
| zone | svr_type | svr_ip | svr_port | name | data_type | value | info | section | scope | source | edit_level | default_value | isdefault |
+-------+----------+----------------+----------+-----------+-----------+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+---------+---------+-------------------+---------------+-----------+
| zone1 | observer | 192.168.40.110 | 2882 | cpu_count | INT | 8 | the number of CPU\'s in the system. If this parameter is set to zero, the number will be set according to sysconf; otherwise, this parameter is used. Range: [0,+∞) in integer | OBSERVER | CLUSTER | DEFAULT | DYNAMIC_EFFECTIVE | 0 | 0 |
+-------+----------+----------------+----------+-----------+-----------+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+---------+---------+-------------------+---------------+-----------+
1 row in set (0.019 sec)
--更改OBServer 自动检测服务器的 CPU 核数
ALTER SYSTEM SET cpu_count=0;
SELECT SVR_IP,CPU_CAPACITY FROM GV$OB_SERVERS WHERE SVR_IP='192.168.40.110'; 返回2
--更改OBServer 自定义CPU 核数 为1
ALTER SYSTEM SET cpu_count=1;
SELECT SVR_IP,CPU_CAPACITY FROM GV$OB_SERVERS WHERE SVR_IP='192.168.40.110'; 返回1
参数说明：
● cpu_count 默认为 0 时，OBServer 自动检测服务器的 CPU 核数，实际的 CPU_COUNT 等于 CPU 核数。
● 可以在 GV$OB_SERVERS 内部表的 CPU_CAPACITY 字段查看实际生效的值。