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Amazon DBS-C01 Exam Questions

Amazon DBS-C01 Exam Questions Answers

AWS Certified Database - Specialty

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Amazon DBS-C01 Sample Questions – Free Practice Test & Real Exam Prep

Question #1

A company's development team needs to have production data restored in a staging AWS account. The production database is running on an Amazon RDS for PostgreSQL Multi-AZ DB instance, which has AWS KMS encryption enabled using the default KMS key. A database specialist planned to share the most recent automated snapshot with the staging account, but discovered that the option to share snapshots is disabled in the AWS Management Console. What should the database specialist do to resolve this? 

  • A. Disable automated backups in the DB instance. Share both the automated snapshot and the default KMS key with the staging account. Restore the snapshot in the staging account and enable automated backups. 
  • B. Copy the automated snapshot specifying a custom KMS encryption key. Share both the copied snapshot and the custom KMS encryption key with the staging account. Restore the snapshot to the staging account within the same Region. 
  • C. Modify the DB instance to use a custom KMS encryption key. Share both the automated snapshot and the custom KMS encryption key with the staging account. Restore the snapshot in the staging account. 
  • D. Copy the automated snapshot while keeping the default KMS key. Share both the snapshot and the default KMS key with the staging account. Restore the snapshot in the staging account. 
Answer: B
Question #2

An online retail company is planning a multi-day flash sale that must support processing of up to 5,000 orders per second. The number of orders and exact schedule for the sale will vary each day. During the sale, approximately 10,000 concurrent users will look at the deals before buying items. Outside of the sale, the traffic volume is very low. The acceptable performance for read/write queries should be under 25 ms. Order items are about 2 KB in size and have a unique identifier. The company requires the most costeffective solution that will automatically scale and is highly available. Which solution meets these requirements?

  • A. Amazon DynamoDB with on-demand capacity mode 
  • B. Amazon Aurora with one writer node and an Aurora Replica with the parallel query feature enabled 
  • C. Amazon DynamoDB with provisioned capacity mode with 5,000 write capacity units (WCUs) and 10,000 read capacity units (RCUs) 
  • D. Amazon Aurora with one writer node and two cross-Region Aurora Replicas 
Answer: A
Explanation: The number of orders and exact schedule for the sale will vary each day. During the sale, approximately 10,000 concurrent users will look at the deals before buying items. Outside of the sale, the traffic volume is very low ==> Setting provisioning DynamoDB fix read 5000/write 10000 with will waste the resource when the traffic is low. It is not cost-effective.
Question #3

A company wants to build a new invoicing service for its cloud-native application on AWS. The company has a small development team and wants to focus on service feature development and minimize operations and maintenance as much as possible. The company expects the service to handle billions of requests and millions of new records every day. The service feature requirements, including data access patterns are welldefined. The service has an availability target of 99.99% with a milliseconds latency requirement. The database for the service will be the system of record for invoicing data. Which database solution meets these requirements at the LOWEST cost?

  • A. Amazon Neptune 
  • B. Amazon Aurora PostgreSQL Serverless 
  • C. Amazon RDS for PostgreSQL 
  • D. Amazon DynamoDB 
Answer: D
Explanation: Known patterns, minimum maintenance, miliseconds latency 
Question #4

Recently, a gaming firm purchased a popular iOS game that is especially popular during the Christmas season. The business has opted to include a leaderboard into the game, which will be powered by Amazon DynamoDB. The application's load is likely to increase significantly throughout the Christmas season. Which solution satisfies these criteria at the lowest possible cost?

  • A. DynamoDB Streams 
  • B. DynamoDB with DynamoDB Accelerator 
  • C. DynamoDB with on-demand capacity mode 
  • D. DynamoDB with provisioned capacity mode with Auto Scaling 
Answer: D
Explanation: "On-demand is ideal for bursty, new, or unpredictable workloads whose traffic can spike in seconds or minutes" vs. 'DynamoDB released auto scaling to make it easier for you to manage capacity efficiently, and auto scaling continues to help DynamoDB users lower the cost of workloads that have a predictable traffic pattern." https://aws.amazon.com/blogs/database/amazon-dynamodb-auto-scaling-performanceand-cost-optimization...
Question #5

An ecommerce company uses a backend application that stores data in an Amazon DynamoDB table. The backend application runs in a private subnet in a VPC and must connect to this table. The company must minimize any network latency that results from network connectivity issues, even during periods of heavy application usage. A database administrator also needs the ability to use a private connection to connect to the DynamoDB table from the application. Which solution will meet these requirements? 

  • A. Use network ACLs to ensure that any outgoing or incoming connections to any port except DynamoDB are deactivated. Encrypt API calls by using TLS.
  •  B. Create a VPC endpoint for DynamoDB in the application's VPC. Use the VPC endpoint to access the table. 
  • C. Create an AWS Lambda function that has access to DynamoDB. Restrict outgoing access only to this Lambda function from the application. 
  • D. Use a VPN to route all communication to DynamoDB through the company's own corporate network infrastructure. 
Question #6

A finance company migrated its 3 ¢’ on-premises PostgreSQL database to an Amazon Aurora PostgreSQL DB cluster. During a review after the migration, a database specialist discovers that the database is not encrypted at rest. The database must be encrypted at rest as soon as possible to meet security requirements. The database specialist must enable encryption for the DB cluster with minimal downtime. Which solution will meet these requirements? 

  • A. Modify the unencrypted DB cluster using the AWS Management Console. Enable encryption and choose to apply the change immediately. 
  • B. Take a snapshot of the unencrypted DB cluster and restore it to a new DB cluster with encryption enabled. Update any database connection strings to reference the new DB cluster endpoint, and then delete the unencrypted DB cluster. 
  • C. Create an encrypted Aurora Replica of the unencrypted DB cluster. Promote the Aurora Replica as the new master. 
  • D. Create a new DB cluster with encryption enabled and use the pg_dump and pg_restore utilities to load data to the new DB cluster. Update any database connection strings to reference the new DB cluster endpoint, and then delete the unencrypted DB cluster. 
Question #7

An internet advertising firm stores its data in an Amazon DynamoDb table. Amazon DynamoDB Streams are enabled on the table, and one of the keys has a global secondary index. The table is encrypted using a customer-managed AWS Key Management Service (AWS KMS) key. The firm has chosen to grow worldwide and want to duplicate the database using DynamoDB global tables in a new AWS Region. An administrator observes the following upon review: No role with the dynamodb: CreateGlobalTable permission exists in the account. An empty table with the same name exists in the new Region where replication is desired. A global secondary index with the same partition key but a different sort key exists in the new Region where replication is desired. Which settings will prevent you from creating a global table or replica in the new Region? (Select two.)

  • A. A global secondary index with the same partition key but a different sort key exists in the new Region where replication is desired. 
  • B. An empty table with the same name exists in the Region where replication is desired. 
  • C. No role with the dynamodb:CreateGlobalTable permission exists in the account. 
  • D. DynamoDB Streams is enabled for the table. 
  • E. The table is encrypted using a KMS customer managed key. 
Answer: A,B

Question #8

A company is planning to use Amazon RDS for SQL Server for one of its critical applications. The company's security team requires that the users of the RDS for SQL Server DB instance are authenticated with on-premises Microsoft Active Directory credentials. Which combination of steps should a database specialist take to meet this requirement? (Choose three.) 

  • A. Extend the on-premises Active Directory to AWS by using AD Connector. 
  • B. Create an IAM user that uses the AmazonRDSDirectoryServiceAccess managed IAM policy. 
  • C. Create a directory by using AWS Directory Service for Microsoft Active Directory. 
  • D. Create an Active Directory domain controller on Amazon EC2. 
  • E. Create an IAM role that uses the AmazonRDSDirectoryServiceAccess managed IAM policy. 
  • F. Create a one-way forest trust from the AWS Directory Service for Microsoft Active Directory directory to the on-premises Active Directory. 
Answer: C,E,F

Question #9

A company hosts a 2 TB Oracle database in its on-premises data center. A database specialist is migrating the database from on premises to an Amazon Aurora PostgreSQL database on AWS. The database specialist identifies a problem that relates to compatibility Oracle stores metadata in its data dictionary in uppercase, but PostgreSQL stores the metadata in lowercase. The database specialist must resolve this problem to complete the migration. What is the MOST operationally efficient solution that meets these requirements? 

  • A. Override the default uppercase format of Oracle schema by encasing object names in quotation marks during creation. 
  • B. Use AWS Database Migration Service (AWS DMS) mapping rules with rule-action as convert-lowercase. 
  • C. Use the AWS Schema Conversion Tool conversion agent to convert the metadata from uppercase to lowercase. 
  • D. Use an AWS Glue job that is attached to an AWS Database Migration Service (AWS DMS) replication task to convert the metadata from uppercase to lowercase. 
Question #10

A company is developing a multi-tier web application hosted on AWS using Amazon Aurora as the database. The application needs to be deployed to production and other nonproduction environments. A Database Specialist needs to specify different MasterUsername and MasterUserPassword properties in the AWS CloudFormation templates used for automated deployment. The CloudFormation templates are version controlled in the company’s code repository. The company also needs to meet compliance requirement by routinely rotating its database master password for production. What is most secure solution to store the master password?

  • A. Store the master password in a parameter file in each environment. Reference the environment-specific parameter file in the CloudFormation template. 
  • B. Encrypt the master password using an AWS KMS key. Store the encrypted master password in the CloudFormation template. 
  • C. Use the secretsmanager dynamic reference to retrieve the master password stored in AWS Secrets Manager and enable automatic rotation. 
  • D. Use the ssm dynamic reference to retrieve the master password stored in the AWS Systems Manager Parameter Store and enable automatic rotation. 
Answer: C
Explanation: "By using the secure string support in CloudFormation with dynamic references you can better maintain your infrastructure as code. You’ll be able to avoid hard coding passwords into your templates and you can keep these runtime configuration parameters separated from your code. Moreover, when properly used, secure strings will help keep your development and production code as similar as possible, while continuing to make your infrastructure code suitable for continuous deployment pipelines." https://aws.amazon.com/blogs/mt/using-aws-systems-manager-parameter-store-securestring-parameters-i... https://aws.amazon.com/blogs/security/how-to-use-aws-secrets-manager-rotatecredentials-amazon-rds-d... 
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