Creating a new MySQL user in Amazon RDS environment - creating a new MySQL user in Amazon RDS environment

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problem ：

I need to create a new MySQL user with limited permission on an existing Amazon RDS instance. I need to Amazon RDS Create a new instance with limited permissions MySQL user .After encountering a couple error messages I was sort of able to do this using the official MySQL Administrator tool and the user now appears in the list. After encountering some error messages , I am a bit able to use the official MySQL The administrator tool performs this operation , The user now appears in the list .However, I'm unable to assign any schema privileges as all the users are greyed out. however , I cannot assign any schema permissions , Because all users are grayed out .I'm logged in as the "master user" created when the instance was launched. I created it when I started the instance “ Primary user ” Identity login .Not sure where to go from here. I don't know where to start .I do have the RDS command line tools installed but wasn't able to track down anything there either. I did install RDS Command line tools , But nothing can be tracked .Ideas Ideas

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Solution ：

Reference resources ： https://stackoom.com/en/question/gn3n