Overview of AWS RDS Aurora Pricing

Amazon Aurora is a modern relational database service that offers performance and high availability at scale, fully open-source MySQL- and PostgreSQL-compatible editions, and a range of developer tools for building serverless and machine learning-driven applications. 

Amazon Aurora Pricing depends on the following features

AWS Aurora Database Instances

For provisioned Aurora, you can choose On-Demand Instances and pay for your database by the hour with no long-term commitments or upfront fees, or choose Reserved Instances for additional savings. Aurora has two flavors

Aurora MySQL-Compatible Edition

1. On-Demand Instance Pricing
   1. On-Demand Instances let you pay for your database (DB) by the hour with no long-term commitments or upfront fees
   2. Pricing is per DB instance-hour consumed, from the time a DB instance is launched until it is stopped or deleted. Partial DB instance-hours are billed in one-second increments with a 10-minute minimum charge
   3. Instance pricing applies to both primary instances, used for read-write workloads, and Amazon Aurora Replicas, used to scale reads and enhance failover.
   4. Two types of instances are offered – Standard Instances and Memory Optimized Instances.
2. Reserved Instance pricing
   1. Reserved Instances are appropriate for steady-state database workloads and offer significant savings over On-Demand.
   2. One Year Reserved Instances provide discounts up to 45 percent and Three Year Reserved Instances provide discounts of up to 66 percent over On-Demand. 
3. Pricing Varies by type of instance. Instance pricing details are available at – https://aws.amazon.com/rds/aurora/pricing/

Database Storage and I/Os

Amazon Aurora database storage consumption is billed in per GB-month increments, and I/Os consumed are billed in per million request increments. You pay only for the storage and I/Os your Amazon Aurora database consumes and do not need to provision in advance.

Storage Rate	$0.10 per GB-month
I/O Rate	$0.20 per 1 million requests

Amazon Aurora Global Database is an optional feature providing low-latency global reads and disaster recovery from region-wide outages. You pay for replicated write I/Os between the primary region and each secondary region.

Replicated Write I/Os

$0.20 per million replicated write I/Os

Backup Storage

Backup storage for Amazon Aurora is the storage associated with your automated database backups and any customer-initiated DB cluster snapshots. 

Backup Storage

$0.021 per GB-month

Backtrack

Backtrack lets you quickly move an Aurora database to a prior point in time without needing to restore data from a backup. This lets you quickly recover from user errors, such as dropping the wrong table or deleting the wrong row. This feature is currently available for the MySQL-compatible edition of Aurora. 

Change Records

$0.012 per 1 million Change Records

Snapshot Export

Amazon Relational Database Service (RDS) Snapshot Export provides an automated method to export data within an RDS or Aurora snapshot to Amazon Simple Storage Service (Amazon S3) in Parquet format. The Parquet format is up to 2x faster to unload and consumes up to 6x less storage in Amazon S3 compared to text formats.

Charge per GB of snapshot size:

$0.010

Data Transfer

1. Data transferred between Amazon Aurora and Amazon Elastic Compute Cloud (Amazon EC2) instances in the same Availability Zone is free. 
2. Data transferred between Availability Zones for DB cluster replication is free. 
3. For data transferred between an Amazon EC2 instance and Amazon Aurora DB instance in different Availability Zones of the same Region, Amazon EC2 Regional Data Transfer charges apply.

Amazon Aurora Cost Calculator

Following is the sample cost calculator for Aurora MYSQL Compatible Instances

Database Instances	3 Memory Optimized Instances – db.r4.4xlarge On-Demand 3 instance(s) x 2.32 USD hourly x 730 hours in a month = 5080.8000 USD Amazon Aurora MySQL Compatible cost (monthly): 5,080.80 USD Reserved 3 instance(s) x 0.48 USD hourly x 730 hours in a month = 1051.2000 USD Amazon Aurora MySQL Compatible cost (monthly): 1,051.20 USD
Database Storage	Storage amount – 100 GB IOPS – Base line rate (1000), Peak (3000), Duration of Peak activity (12 hrs) Total Storage Cost (monthly): 786.16 USD
Backup Storage	500 GB of Backup Storage Additional backup storage cost (monthly): 10.50 USD
Total Cost	Total cost varies by sum of the all above costs depending on-demand vs Reserved

For more details , use AWS Pricing Calculator – https://calculator.aws/#/