Which of the following data replication methods is utilized by Amazon RDS read-replica instances?
Click on the arrows to vote for the correct answer
A. B. C. D.Answer: D.
Option A is incorrect because Amazon RDS does not use multi-master replication for the read replica instances.
Instead, data is replicated asynchronously to the secondary read replica nodes.
Option B is incorrect because Amazon RDS does not use lazy replication for read replica instances.
Instead, data is replicated asynchronously to the secondary read replica nodes.
Option C is incorrect because Amazon RDS does not use synchronous replication for the read replica instances.
Instead, data is replicated asynchronously to the secondary read replica nodes.
Option D is CORRECT because Amazon RDS utilizes an asynchronous method to replicate changes in the primary Amazon RDS instance to secondary read replica instances.
Reference:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ReadRepl.htmlAmazon RDS (Relational Database Service) provides a managed database service for various database engines such as MySQL, PostgreSQL, Oracle, and Microsoft SQL Server. One of the benefits of Amazon RDS is the ability to create read-replica instances to improve scalability and availability.
Regarding the replication method utilized by Amazon RDS read-replica instances, the correct answer is D. Asynchronous replication.
Asynchronous replication is a method of database replication where data is replicated to the replica database asynchronously. In other words, changes made to the primary database are not immediately propagated to the replica database. Instead, they are queued up and replicated to the replica database at some point in the future.
In the context of Amazon RDS, read-replica instances are used to offload read traffic from the primary database instance. The read-replica instance maintains a copy of the data from the primary instance, which is kept in sync using asynchronous replication. The replication lag between the primary instance and the read-replica instance can vary depending on the size of the data and the rate of changes to the data. However, Amazon RDS provides mechanisms to monitor and manage replication lag to ensure that read traffic is directed to a read-replica instance only if the data is sufficiently up-to-date.
Multi-master replication is a type of replication where multiple nodes can accept write operations. This method is not utilized by Amazon RDS read-replica instances.
Lazy replication is a type of replication where data is replicated only when it is needed. This method is not utilized by Amazon RDS read-replica instances.
Synchronous replication is a type of replication where data is replicated to the replica database synchronously. This means that changes made to the primary database are immediately propagated to the replica database. However, synchronous replication can impact performance and availability, and it is not utilized by Amazon RDS read-replica instances.