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The AWS Certified Database - Specialty exam is designed for database administrators, architects, and developers who want to demonstrate their skills in database design, migration, deployment, monitoring, and optimization on AWS. AWS-Certified-Database-Specialty exam covers a wide range of topics such as relational and non-relational databases, data warehousing, data migration, backup and recovery, performance tuning, and security.

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Amazon DBS-C01 (AWS Certified Database - Specialty) certification exam is designed for IT professionals who specialize in managing and using databases in the cloud. AWS Certified Database - Specialty (DBS-C01) Exam certification is intended to validate an individual's expertise in database architecture, data modeling, storage, security, and migration in AWS. By passing AWS-Certified-Database-Specialty exam, you will demonstrate your ability to design, implement, and maintain databases on AWS.

Amazon AWS Certified Database - Specialty (DBS-C01) Exam Sample Questions (Q82-Q87):

NEW QUESTION # 82
A company is running an on-premises application comprised of a web tier, an application tier, and a MySQL database tier. The database is used primarily during business hours with random activity peaks throughout the day. A database specialist needs to improve the availability and reduce the cost of the MySQL database tier as part of the company's migration to AWS.
Which MySQL database option would meet these requirements?

A. Amazon RDS for MySQL with Multi-AZ
B. Amazon Aurora MySQL cluster
C. Amazon Aurora Serverless MySQL cluster
D. Amazon RDS for MySQL with read replica

Answer: B

NEW QUESTION # 83
A Database Specialist is troubleshooting an application connection failure on an Amazon Aurora DB cluster with multiple Aurora Replicas that had been running with no issues for the past 2 months. The connection failure lasted for 5 minutes and corrected itself after that. The Database Specialist reviewed the Amazon RDS events and determined a failover event occurred at that time. The failover process took around 15 seconds to complete.
What is the MOST likely cause of the 5-minute connection outage?

A. There were no active Aurora Replicas in the Aurora DB cluster
B. After failover, the Aurora DB cluster needs time to warm up before accepting client connections
C. The client-side application is caching the DNS data and its TTL is set too high
D. After a database crash, Aurora needed to replay the redo log from the last database checkpoint

Answer: C

Explanation:
Explanation
When your application tries to establish a connection after a failover, the new Aurora PostgreSQL writer will be a previous reader, which can be found using the Aurora read only endpoint before DNS updates have fully propagated. Setting the java DNS TTL to a low value helps cycle between reader nodes on subsequent connection attempts.
Amazon Aurora is designed to recover from a crash almost instantaneously and continue to serve your application data. Unlike other databases, after a crash Amazon Aurora does not need to replay the redo log from the last database checkpoint before making the database available for operations. Amazon Aurora performs crash recovery asynchronously on parallel threads, so your database is open and available immediately after a crash. Because the storage is organized in many small segments, each with its own redo log, the underlying storage can replay redo records on demand in parallel and asynchronously as part of a disk read after a crash. This approach reduces database restart times to less than 60 seconds in most cases

NEW QUESTION # 84
A large company is using an Amazon RDS for Oracle Multi-AZ DB instance with a Java application. As a part of its disaster recovery annual testing, the company would like to simulate an Availability Zone failure and record how the application reacts during the DB instance failover activity. The company does not want to make any code changes for this activity.
What should the company do to achieve this in the shortest amount of time?

A. Use RDS fault injection queries to simulate the primary node failure
B. Use a blue-green deployment with a complete application-level failover test
C. Add a rule to the NACL to deny all traffic on the subnets associated with a single Availability Zone
D. Use the RDS console to reboot the DB instance by choosing the option to reboot with failover

Answer: D

Explanation:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_RebootInstance.html
https://exain.wordpress.com/2017/07/12/amazon-rds-multi-az-setup-failover-simulation/
"Rebooting with failover is beneficial when you want to simulate a failure of a DB instance for testing, or restore operations to the original AZ after a failover occurs."

NEW QUESTION # 85
A Database Specialist is designing a disaster recovery strategy for a production Amazon DynamoDB table. The table uses provisioned read/write capacity mode, global secondary indexes, and time to live (TTL). The Database Specialist has restored the latest backup to a new table.
To prepare the new table with identical settings, which steps should be performed? (Choose two.)

A. Encrypt the table from the AWS Management Console or use the update-table command
B. Set the provisioned read and write capacity
C. Define the TTL settings
D. Re-create global secondary indexes in the new table
E. Define IAM policies for access to the new table

Answer: B,D

NEW QUESTION # 86
A Database Specialist is designing a disaster recovery strategy for a production Amazon DynamoDB table. The table uses provisioned read/write capacity mode, global secondary indexes, and time to live (TTL). The Database Specialist has restored the latest backup to a new table.
To prepare the new table with identical settings, which steps should be performed? (Choose two.)

A. Re-create global secondary indexes in the new table
B. Encrypt the table from the AWS Management Console or use the update-table command
C. Define IAM policies for access to the new table
D. Define the TTL settings
E. Set the provisioned read and write capacity

Answer: C,D

Explanation:
The following items need to be reconfigured after restoring the DynamoDB table.
--AutoScaling policy
--IAM policy
--CloudWatch settings
--Tags
--Stream settings
--TTL
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/backuprestore_HowItWorks.html

NEW QUESTION # 87
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