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DB Instance in VPC
Following are the pre-requisites necessary to create a DB Instances within a VPC:
You need to have a VPC set up with at least one subnet created in every Availability Zone in the Region you want to deploy your DB Instance. For information on creating Amazon VPC and subnets refer to the Getting Started Guide for Amazon VPC. You need to have a DB Subnet Group defined for your VPC.
You need to have a DB Security Group defined for your VPC (or you can use the default provided).
In addition, you should allocate adequately large CIDR blocks to each of your subnets so that there are enough spare IP addresses for Amazon RDS to use during maintenance activities including scale compute and failover etc.
The basic functionality of Amazon RDS is the same regardless of whether VPC is used. Amazon RDS manages backups, software patching, automatic failure detection, read replicas and recovery whether your DB Instances are deployed inside or outside a VPC.
Amazon RDS DB Instances deployed outside a VPC are assigned an external IP address (to which the Endpoint/DNS Name resolves) that provides connectivity from EC2 or the Internet. In Amazon VPC, Amazon RDS DB instances only have a private IP address (within a subnet that you de).
Scenario when Read Replica Needed
There are a variety of scenarios where deploying one or more Read Replicas for a given source DB Instance may make sense. Common reasons for deploying a Read Replica include:
Scaling beyond the compute or I/O capacity of a single DB Instance for read-heavy database workloads. This excess read traffic can be directed to one or more Read Replicas.
Serving read traffic while the source DB Instance is unavailable. If your source DB Instance cannot take I/O requests (e.g. due to I/O suspension for backups or scheduled maintenance), you can direct read traffic to your Read Replica(s). For this use case, keep in mind that the data on the Read Replica may be stale since the source DB Instance is unavailable.
Business reporting or data warehousing scenarios; you may want business reporting queries to run against a Read Replica, rather than your primary, production DB Instance.
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