Amazon RDS Read Replicas
Amazon RDS Read Replicas allow enhancing the performance of a database by offloading read traffic from the primary instance. These replicas are asynchronous copies of the primary database across different regions or within the same region. Multiple read replicas can be created for each primary database, offering horizontal scaling by distributing read requests across replicas. They can also be promoted to a standalone database, serving disaster recovery or migration purposes. Read Replicas support PostgreSQL, MySQL, MariaDB, and Amazon Aurora database engines.
Guide on Amazon RDS Read Replicas
Amazon RDS Read Replicas provide enhanced performance and durability for RDS database (DB) instances. They allow unidirectional replication from a source DB instance to one or more replicas.
Importance: RDS Read Replicas are important because they help increase the read traffic, offload the amount of SQL read traffic, and promote the read replica in the event of a source DB instance failure.
Working: When you create a read replica, you first specify an existing DB instance as a source. RDS takes a snapshot of this source instance, creates a read replica from this snapshot, and then uses the asynchronous replication method to update the replica whenever changes occur to the source DB.
Exam Tips:
Understanding the following will be critical while answering questions on Amazon RDS Read Replicas:
- Know the scenarios where read replicas would be beneficial
- Understand the process of promoting a read replica
- Be clear on how replication works
- Remember Read Replicas can be created in different regions than the master DB
When answering, indentify the benefits and the workings of RDS read replicas for the given scenario and choose the answer that reflects the highest advantage of using them correctly.
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