OceanBase数据库报了内存不足问题，但是用sys租户连接后，没办法找到内存设置，这是为什么呀

select a.zone, a.SVR_IP,a.SVR_PORT, b.status,cpu_capacity,cpu_assigned_max,cpu_capacity-cpu_assigned_max as cpu_free,round(memory_limit /1024/1024/1024 ,2) as memory_total_gb,round((memory_limit-mem_capacity) /1024/1024/1024 ,2) as system_memory_gb,round(mem_assigned /1024/1024/1024 ,2) as mem_assigned_gb,round((mem_capacity-mem_assigned) /1024/1024/1024 ,2) as memory_free_gb,round(log_disk_capacity /1024/1024/1024 ,2) as log_disk_capacity_gb,round(log_disk_assigned /1024/1024/1024 ,2) as log_disk_assigned_gb,round((log_disk_capacity-log_disk_assigned) /1024/1024/1024 ,2) as log_disk_free_gb,round((data_disk_capacity /1024/1024/1024 ),2) as data_disk_gb,round((data_disk_in_use /1024/1024/1024 ),2) as data_disk_used_gb,round((data_disk_capacity-data_disk_in_use) /1024/1024/1024 ,2) as data_disk_free_gb from gv$ob_servers a join oceanbase.DBA_OB_SERVERS b on a.zone=b.zone\G;
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