For details about AWS RDS Parameter groups, please click here.
When the parameter group is mapped to a database instance, even though some of the variables are dynamic and editable, they cannot be altered. This happens to the default parameter group as well as with the custom parameter group. You must first create a new parameter group, change the values as appropriate, and then assign the parameter group to the DB instance if you experience any of the aforementioned issues.
According to their needs, one would have updated a large number of parameter values in the existing parameter group, it goes without saying. If we choose to ignore it and instead build a custom parameter group, the new parameter group comes with the default values, which we must alter to the needed values. Since we must compare with the current parameter groups to prevent any errors, this requires effort.
To avoid this, we can copy the existing parameter group and modify the exact parameter and then assign it to the DB instances. Here are the steps to be followed –
Hope you find this article helpful.
Big Data and SQL 