Changing the value of the parameter_group_name in aws_db_instance causes the RDS instance to be destroyed and recreated

[ColinHebert]

parameter_group_name should be a value that can be changed without destroying the database.

[phinze]

Yup totally. I think the first pass of the RDS resource just implemented the CreateDBInstance, DescribeDBInstance, and DeleteDBInstance API actions and marked all the parameters as ForceNew.

That was a good start, but now we need to circle around and catch the attributes that can be updated with ModifyDB*.

The relevant API endpoint for this issue will be http://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_ModifyDBParameterGroup.html

[catsby]

Fixed in #1341

[ghost]

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