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Question 851 - SAP-C01 discussion

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You are running a successful multitier web application on AWS and your marketing department has asked you to add a reporting tier to the application. The reporting tier will aggregate and publish status reports every 30 minutes from usergenerated information that is being stored in your web application s database. You are currently running a Multi-AZ RDS MySQL instance for the database tier. You also have implemented Elasticache as a database caching layer between the application tier and database tier.

Please select the answer that will allow you to successfully implement the reporting tier with as little impact as possible to your database.

A.
Continually send transaction logs from your master database to an S3 bucket and generate the reports off the S3 bucket using S3 byte range requests.
Answers
A.
Continually send transaction logs from your master database to an S3 bucket and generate the reports off the S3 bucket using S3 byte range requests.
B.
Generate the reports by querying the synchronously replicated standby RDS MySQL instance maintained through Multi- AZ.
Answers
B.
Generate the reports by querying the synchronously replicated standby RDS MySQL instance maintained through Multi- AZ.
C.
Launch a RDS Read Replica connected to your Multi AZ master database and generate reports by querying the Read Replica.
Answers
C.
Launch a RDS Read Replica connected to your Multi AZ master database and generate reports by querying the Read Replica.
D.
Generate the reports by querying the ElastiCache database caching tier.
Answers
D.
Generate the reports by querying the ElastiCache database caching tier.
Suggested answer: C

Explanation:

Amazon RDS allows you to use read replicas with Multi-AZ deployments. In Multi-AZ deployments for MySQL, Oracle, SQL Server, and PostgreSQL, the data in your primary DB Instance is synchronously replicated to to a standby instance in a different Availability Zone (AZ). Because of their synchronous replication, Multi-AZ deployments for these engines offer greater data durability benefits than do read replicas. (In all Amazon RDS for Aurora deployments, your data is automatically replicated across 3 Availability Zones.)

You can use Multi-AZ deployments and read replicas in conjunction to enjoy the complementary benefits of each. You can simply specify that a given Multi-AZ deployment is the source DB Instance for your Read replicas. That way you gain both the data durability and availability benefits of Multi-AZ deployments and the read scaling benefits of read replicas. Note that for Multi-AZ deployments, you have the option to create your read replica in an AZ other than that of the primary and the standby for even more redundancy. You can identify the AZ corresponding to your standby by looking at the "Secondary Zone" field of your DB Instance in the AWS Management Console.

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asked 16/09/2024
Wislon Pereira
36 questions
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