In the traditional streaming replication, the parameter wal_keep_segments maintains the number of WAL files at the instance. Unlike streaming physical replication for replicas in the same Region, Amazon RDS for PostgreSQL uses physical streaming replication with slots for cross-Region replicas. You can also use AWS CLI create-db-instance-read-replica to create a cross-Region read replica. From the Actions drop-down menu, choose Create Read Replica.On the Amazon RDS console, choose your Amazon RDS for PostgreSQL source instance.The easiest way to create a cross-Region replica for Amazon RDS for PostgreSQL is by completing the following steps: Before writing any data changes to permanent storage, these changes are first recorded in WAL files. WAL files are PostgreSQL transaction logs. Starts streaming write-ahead logs (WALs) from the source to replica.Configures replication slot streaming between the source and cross-Region replica.Copies the snapshot to the destination Region.Takes a snapshot at the source instance.During the creation of a cross-Region replica, the system performs the following steps: What happens during a cross-Region read replica creationĪmazon RDS for PostgreSQL supports cross-Region read replicas for versions 9.5.2 and later. Common issues while using an Amazon RDS for PostgreSQL cross-Region replica.What happens during a cross-Region read replica creation.This post discusses some of the best practices for Amazon RDS for PostgreSQL cross-Region replication on the following topics: There are additional data transfer charges for cross-Region read replicas.Īlthough Amazon RDS makes cross-Region read replicas simple, you still must be aware of several caveats to get the best experience. You can create a cross-Region read replica by using the Amazon RDS console, AWS CLI, or API create-db-instance-read-replica. Cross-Region read replicas enable you to have a disaster recovery solution, scaling read database workload, and cross-Region migration. This 23 page document was authored by AWS Solutions Architect Miles Ward and the senior staffers at PalominoDB.One of the managed service offerings of Amazon RDS for PostgreSQL is cross-Region read replicas. The first such white paper, RDBMS in the Cloud: PostgreSQL on AWS, was released a few days ago. In order to provide you with the information that you need to do this while taking advantage of all of the flexibility that AWS has to offer, we have worked with our partners to write some very detailed white papers. You also have the option to launch the database of your choice on an Amazon EC2 instance. The AWS Marketplace also contains a very well-curated selection of relational and NoSQL databases and caches. On the NoSQL side, DynamoDB can scale to accommodate any amount of data and any request rate, making it ideal for applications with an unlimited potential to grow. RDS will take care of the scaling, backup, maintenance, patching, and failover for you so that you can focus on your application. On the relational side, you can use the Relational Database Service (RDS) to run a MySQL, Oracle, or SQL Server database. You have a plethora of options when you want to run a relational or NoSQL databases on AWS.
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