You need to create an external schema using the query CREATE EXTERNAL SCHEMA and point to the actual database and table from PostgreSQL or MySQL Connect to your RDS and Aurora databases (PostgreSQL /MySQL) by using an external schema.Attach the IAM role that you previously created to the Amazon Redshift cluster.Then reference the secrets in IAM access policies and roles, so that the Redshift cluster has access to get the database credentials from the secret manager Next, you can set up secrets in AWS Secrets Manager for your RDS and Aurora databases.Please refer to the architecture diagram shown above to understand it in details. This way, you can add the security group for the Amazon Redshift cluster to the inbound rules of the security group for your RDS or Aurora PostgreSQL DB instance. For that, your Amazon Redshift cluster and Amazon RDS or Aurora instance should be in the same VPC and subnet group. For this, you need to make sure that your RDS or Aurora DB instance can accept connections from your Amazon Redshift cluster. Set up the connectivity from your Amazon Redshift cluster to your Amazon RDS or Aurora PostgreSQL DB/MySQL instance.How to achieve Federated Query with MySQL and PostgreSQL databases? Amazon Redshift then distributes the result rows among the compute nodes for further processing. From a compute node, Amazon Redshift issues subqueries with a predicate pushed down and retrieves the result rows. When running federated queries, Amazon Redshift first makes a client connection to the RDS or Aurora DB instance from the leader node to retrieve table metadata. Amazon Redshift also uses its parallel processing capacity to support running these queries, as needed. To reduce the data movement over the network and improve performance, Amazon Redshift distributes part of the computation for federated queries directly into the remote operational databases. Federated queries currently can work with external databases in Amazon RDS for PostgreSQL, Amazon Aurora PostgreSQL-Compatible Edition, Amazon RDS for MySQL, and Amazon Aurora MySQL-Compatible Edition. With the Federated Query feature, you can integrate queries from Amazon Redshift on live data in external databases. Federated Query Architecture - Redshift Overviewįederated queries in Amazon Redshift, enables you to query and analyze data across operational databases, data warehouses, and data lakes.
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