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Continue to ChatQuery : Is it better to have AWS EC2 and RDS is the same Availability Zone? I run a web app in an AWS EC2 instance and the database for the app in an RDS instance both in Amazon Web Services https://vmapp.org/query/111457/Is-It-Better-To-Have-AWS-EC2-And-RDS-Is-The-Same-Availability-Zone-I-Run-A-Web-App-In-An-AWS-EC2-Instance-And-The-Database-For-The-App-In-An-RDS-Instance-Both-In-Amazon-Web-Services/