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How do RDS Read Replicas work?
The read replica operates as a DB instance that allows only read-only connections. Applications connect to a read replica the same way they do to any DB instance. Amazon RDS replicates all databases in the source DB instance. A mounted replica doesn’t accept user connections and so can’t serve a read-only workload.
What is AWS RDS Read replica?
Amazon RDS Read Replicas provide enhanced performance and durability for RDS database (DB) instances. The read replica operates as a DB instance that allows only read-only connections; applications can connect to a read replica just as they would to any DB instance.
Which items are key features of Read replicas?
Benefits
- Enhanced performance. You can reduce the load on your source DB instance by routing read queries from your applications to the read replica.
- Increased availability.
- Designed for security.
What happens when you delete a Read Replica in RDS?
Amazon RDS sets the necessary parameters and permissions for the source DB instance and the read replica without any service interruption. A snapshot is taken of the source DB instance, and this snapshot becomes the read replica. No outage occurs when you delete a read replica.
How many read replicas can I add to MySQL?
Amazon RDS for MySQL, MariaDB, PostgreSQL, Oracle, and SQL Server allow you to add up to 5 read replicas to each DB Instance. Amazon RDS for MySQL, MariaDB, PostgreSQL, and Oracle offer you two SSD-based choices for database storage: General Purpose and Provisioned IOPS.
Can You replicate between regions in Amazon RDS?
The following extra considerations apply when replicating between regions: You can only replicate between regions when using Amazon RDS DB instances of MariaDB, PostgreSQL (versions 9.4.7 and 9.5.2 and later), or MySQL 5.6 and later. A source DB instance can have cross-region Read Replicas in multiple regions.
How are read replicas used in relational database?
You can reduce the load on your primary DB instance by routing read queries from your applications to the read replica. Using read replicas, you can elastically scale out beyond the capacity constraints of a single DB instance for read-heavy database workloads.