dashboard top sql功能提示该功能未启用

🪐 TiDB 技术问题
11 
(tidb@172.16.201.18) [(none)]>set global tidb_enable_top_sql = 1;
ERROR 1227 (42000): Access denied; you need (at least one of) the SUPER or SYSTEM_VARIABLES_ADMIN privilege(s) for this operation

看起来不行