A parameter group is a configuration parameter template of a database. A parameter group template can be applied to one or more database instances. The system will create a default parameter template for each user, and the default parameter group cannot be modified or deleted. Users can create multiple parameter groups.
Modifying a parameter group will not directly modify the parameters of the instance, and they are mutually independent. Only applying the parameter group to the instance will the configuration parameters of the instance be modified.
Note：
To ensure the stable performance of the database, only the parameter items that can be adjusted in the database engine are open for the time being.