ORA-13864: Statistics aggregation for service (module/action) string is already enabled
Cause: Attempt to enable a service-level statistics aggregation which has been already enabled
Action: Supply correct service(module/action)
：
ORA-13864: Statistics aggregation for service (module/action) string is already enabled是Oracle数据库出现的一条错误信息，用于指出当前执行的查询语句的模块/行为的统计信息聚合已经启用。