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DBS-C01 PDF + Testing Engine



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  • Exam Name: AWS Certified Database - Specialty
  • Last Update: 02-Dec-2022
  • Questions and Answers: 270
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DBS-C01 Questions and Answers

Question # 1

A Database Specialist is designing a new database infrastructure for a ride hailing application. The application data includes a ride tracking system that stores GPS coordinates for all rides. Real-time statistics and metadata lookups must be performed with high throughput and microsecond latency. The database should be fault tolerant with minimal operational overhead and development effort.

Which solution meets these requirements in the MOST efficient way?


Use Amazon RDS for MySQL as the database and use Amazon ElastiCache


Use Amazon DynamoDB as the database and use DynamoDB Accelerator


Use Amazon Aurora MySQL as the database and use Aurora’s buffer cache


Use Amazon DynamoDB as the database and use Amazon API Gateway

Question # 2

An worldwide gaming company's development team is experimenting with using Amazon DynamoDB to store in-game events for three mobile titles. Maximum concurrent users for the most popular game is 500,000, while the least popular game is 10,000. The typical event is 20 KB in size, while the average user session generates one event each second. Each event is assigned a millisecond time stamp and a globally unique identification.

The lead developer generated a single DynamoDB database with the following structure for the events:

  • Partition key: game name
  • Sort key: event identifier
  • Local secondary index: player identifier
  • Event time

In a small-scale development setting, the tests were successful. When the application was deployed to production, however, new events were not being added to the database, and the logs indicated DynamoDB failures with the ItemCollectionSizeLimitExceededException issue code.

Which design modification should a database professional offer to the development team?


Use the player identifier as the partition key. Use the event time as the sort key. Add a global secondary index with the game name as the partition key and the event time as the sort key.


Create two tables. Use the game name as the partition key in both tables. Use the event time as the sort key for the first table. Use the player identifier as the sort key for the second table.


Replace the sort key with a compound value consisting of the player identifier collated with the event time, separated by a dash. Add a local secondary index with the player identifier as the sort key.


Create one table for each game. Use the player identifier as the partition key. Use the event time as the sort key.

Question # 3

A company is using Amazon Aurora MySQL as the database for its retail application on AWS. The company receives a notification of a pending database upgrade and wants to ensure upgrades do not occur before or during the most critical time of year. Company leadership is concerned that an Amazon RDS maintenance window will cause an outage during data ingestion.

Which step can be taken to ensure that the application is not interrupted?


Disable weekly maintenance on the DB cluster.


Clone the DB cluster and migrate it to a new copy of the database.


Choose to defer the upgrade and then find an appropriate down time for patching.


Set up an Aurora Replica and promote it to primary at the time of patching.

Question # 4

A company has a quarterly customer survey. The survey uses an Amazon EC2 instance that is hosted in a public subnet to host a customer survey website. The company uses an Amazon RDS DB instance that is hosted in a private subnet in the same VPC to store the survey results.

The company takes a snapshot of the DB instance after a survey is complete, deletes the DB instance, and then restores the DB instance from the snapshot when the survey needs to be conducted again. A database specialist discovers that the customer survey website times out when it attempts to establish a connection to the restored DB instance.

What is the root cause of this problem?


The VPC peering connection has not been configured properly for the EC2 instance to communicate with the DB instance.


The route table of the private subnet that hosts the DB instance does not have a NAT gateway configured for communication with the EC2 instance.


The public subnet that hosts the EC2 instance does not have an internet gateway configured for communication with the DB instance.


The wrong security group was associated with the new DB instance when it was restored from the snapshot.

Question # 5

A marketing company is using Amazon DocumentDB and requires that database audit logs be enabled. A Database Specialist needs to configure monitoring so that all data definition language (DDL) statements performed are visible to the Administrator. The Database Specialist has set the audit_logs parameter to enabled in the cluster parameter group.

What should the Database Specialist do to automatically collect the database logs for the Administrator?


Enable DocumentDB to export the logs to Amazon CloudWatch Logs


Enable DocumentDB to export the logs to AWS CloudTrail


Enable DocumentDB Events to export the logs to Amazon CloudWatch Logs


Configure an AWS Lambda function to download the logs using the download-db-log-file-portion operation and store the logs in Amazon S3

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