Free AWS Certified Database Specialty (DBS-C01). 50 Past Questions with Answers

Practice the AWS Certified Database Specialty (DBS-C01) Past Questions with Answers. Questions and Answers set by our experts have provided the correct answers to the DBS-C01 AWS Certified Database Specialty questions. Prepare yourself for the exam ahead and test your knowledge and readiness.

AWS Certified Database Specialty (DBS-C01) Part 2

AWS Certified Database Specialty (DBS-C01) Part 2

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

1. A company with branch offices in Portland, New York, and Singapore has a threetier web application that leverages a shared database. The database runs on
Amazon RDS for MySQL and is hosted in the us-west-2 Region. The application
has a distributed front end deployed in the us-west-2, ap-southheast-1, and useast-2 Regions. This front end is used as a dashboard for Sales Managers in each
branch office to see current sales statistics. There are complaints that the
dashboard performs more slowly in the Singapore location than it does in
Portland or New York. A solution is needed to provide consistent performance for
all users in each location. Which set of actions will meet these requirements?

Take a snapshot of the instance in the us-west-2 Region. Create a new instance from the snapshot in the ap-southeast-1 Region. Reconfigure the ap-southeast-1 front-end dashboard to access this instance.

Create an RDS read replica in the us-west-2 Region where the primary instance resides. Create a read replica in the ap-southeast-1 Region from the read replica located on the us-west-2 Region. Reconfigure the ap-southeast-1 front-end dashboard to access this instance.

Create an RDS read replica in the ap-southeast-1 Region from the primary RDS DB instance in the us- west-2 Region. Reconfigure the ap-southeast-1 front-end dashboard to access this instance.

Create a new RDS instance in the ap-southeast-1 Region. Use AWS DMS and change data capture (CDC) to update the new instance in the ap-southeast-1 Region. Reconfigure the ap-southeast-1 front-end dashboard to access this instance.

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2. 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 Aurora MySQL as the database and use Aurora's buffer cache.

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

Use Amazon DynamoDB as the database and use DynamoDB Accelerator

Use Amazon DynamoDB as the database and use Amazon API Gateway

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

3. A company is running an Amazon RDS for PostgeSQL DB instance and wants to
migrate it to an Amazon Aurora PostgreSQL DB cluster. The current database is 1
TB in size. The migration needs to have minimal downtime. What is the FASTEST
way to accomplish this?

Use the pg_dump and pg_restore utilities to extract and restore the RDS for PostgreSQL DB instance to the Aurora PostgreSQL DB cluster.

Migrate data from the RDS for PostgreSQL DB instance to an Aurora PostgreSQL DB cluster using an Aurora Replica. Promote the replica during the cutover.

Create a database snapshot of the RDS for PostgreSQL DB instance and use this snapshot to create the Aurora PostgreSQL DB cluster.

Create an Aurora PostgreSQL DB cluster. Set up replication from the source RDS for PostgreSQL DB instance using AWS DMS to the target DB cluster.

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4. A company needs a data warehouse solution that keeps data in a consistent,
highly structured format. The company requires fast responses for end-user
queries when looking at data from the current year, and users must have access to
the full 15-year dataset, when needed. This solution also needs to handle a
fluctuating number incoming queries. Storage costs for the 100 TB of data must
be kept low. Which solution meets these requirements?

Leverage an Amazon Redshift data warehouse solution using a dense storage instance to store the most recent data. Keep historical data on Amazon S3 and access it using the Amazon Redshift Spectrum layer. Enable Amazon Redshift Concurrency Scaling.

Leverage an Amazon Redshift data warehouse solution using a dense storage instance type while keeping all the data on local Amazon Redshift storage. Provision enough instances to support high demand.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

5. A company has an Amazon RDS Multi-AZ DB instances that is 200 GB in size with
an RPO of 6 hours. To meet the company's disaster recovery policies, the database
backup needs to be copied into another Region. The company requires the
solution to be cost-effective and operationally efficient. What should a Database
Specialist do to copy the database backup into a different Region?

Create an AWS Lambda function to take an Amazon RDS snapshot every 6 hours and use a second Lambda function to copy the snapshot into another Region.

Create a cross-Region read replica for Amazon RDS in another Region and take an automated snapshot of the read replica.

Use Amazon RDS automated snapshots and use AWS Lambda to copy the snapshot into another Region.

Use Amazon RDS automated snapshots every 6 hours and use Amazon S3 crossRegion replication to copy the snapshot into another Region.

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6. A retail company is about to migrate its online and mobile store to AWS. The
company's CEO has strategic plans to grow the brand globally. A Database
Specialist has been challenged to provide predictable read and write database
performance with minimal operational overhead. What should the Database
Specialist do to meet these requirements?

Use Amazon DynamoDB Streams to replicate all DynamoDB transactions and sync them.

Use Amazon Aurora Global Database to synchronize all transactions.

Use Amazon EMR to copy the orders table data across Regions.

Use Amazon DynamoDB global tables to synchronize transactions.

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7. An Amazon RDS EBS-optimized instance with Provisioned IOPS (PIOPS) storage is
using less than half of its allocated IOPS over the course of several hours under
constant load. The RDS instance exhibits multi-second read and write latency, and
uses all of its maximum bandwidth for read throughput, yet the instance uses less
than half of its CPU and RAM resources. What should a Database Specialist do in
this situation to increase performance and return latency to sub- second levels?

Change the DB instance to an instance class with a higher maximum bandwidth.

Disable EBS optimization on the DB instance

Change the underlying EBS storage type to General Purpose SSD (gp2).

Increase the size of the DB instance storage.

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8. The Development team recently executed a database script containing several
data definition language (DDL) and data manipulation language (DML) statements
on an Amazon Aurora MySQL DB cluster. The release accidentally deleted
thousands of rows from an important table and broke some application
functionality. This was discovered 4 hours after the release. Upon investigation, a
Database Specialist tracked the issue to a DELETE command in the script with an
incorrect WHERE clause filtering the wrong set of rows. The Aurora DB cluster has
Backtrack enabled with an 8-hour backtrack window. The Database Administrator
also took a manual snapshot of the DB cluster before the release started. The
database needs to be returned to the correct state as quickly as possible to
resume full application functionality. Data loss must be minimal. How can the
Database Specialist accomplish this?

Restore the DB cluster using the manual backup snapshot created before the release and change the application configuration settings to point to the new DB cluster.

Perform a point-in-time recovery (PITR) of the DB cluster to a time before the release and copy the deleted rows from the restored database to the original database.

Quickly rewind the DB cluster to a point in time before the release using Backtrack.

Create a clone of the DB cluster with Backtrack enabled. Rewind the cloned cluster to a point in time before the release. Copy deleted rows from the clone to the original database.

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9. A Database Specialist modified an existing parameter group currently associated
with a production Amazon RDS for SQL Server Multi-AZ DB instance. The change
is associated with a static parameter type, which controls the number of user
connections allowed on the most critical RDS SQL Server DB instance for the
company. This change has been approved for a specific maintenance window to
help minimize the impact on users. How should the Database Specialist apply the
parameter group change for the DB instance?

Select the option to apply the change immediately.

Reboot the secondary Multi-AZ DB instance.

Allow the preconfigured RDS maintenance window for the given DB instance to control when the change is applied.

Apply the change manually by rebooting the DB instance during the approved maintenance window.

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10. A global digital advertising company captures browsing metadata to contextually
display relevant images, pages, and links to targeted users. A single page load can
generate multiple events that need to be stored individually. The maximum size of
an event is 200 KB and the average size is 10 KB. Each page load must query the
user's browsing history to provide targeting recommendations. The advertising
company expects over 1 billion page visits per day from users in the United States,
Europe, Hong Kong, and India. The structure of the metadata varies depending on
the event. Additionally, the browsing metadata must be written and read with very
low latency to ensure a good viewing experience for the users. Which database
solution meets these requirements?

Amazon DynamoDB global table.

Amazon Aurora Global Database.

Amazon DocumentDB

Amazon RDS Multi-AZ deployment.

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11. 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.)

Define IAM policies for access to the new table.

Set the provisioned read and write capacity.

Define the TTL settings.

Re-create global secondary indexes in the new table.

Encrypt the table from the AWS Management Console or use the update-table command.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

12. 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?

After a database crash, Aurora needed to replay the redo log from the last database checkpoint.

After failover, the Aurora DB cluster needs time to warm up before accepting client connections.

There were no active Aurora Replicas in the Aurora DB cluster.

The client-side application is caching the DNS data and its TTL is set too high.

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13. A company is using Amazon RDS for MySQL to redesign its business application. A
Database Specialist has noticed that the Development team is restoring their
MySQL database multiple times a day when Developers make mistakes in their
schema updates. The Developers sometimes need to wait hours to the restores to
complete. Multiple team members are working on the project, making it difficult
to find the correct restore point for each mistake. Which approach should the
Database Specialist take to reduce downtime?

Enable the Amazon RDS for MySQL Backtrack feature.

Migrate to Amazon RDS for SQL Server, take a snapshot, and restore from the snapshot.

Migrate to Amazon Aurora MySQL and enable the Aurora Backtrack feature.

Deploy multiple read replicas and have the team members make changes to separate replica instances.

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14. A company is concerned about the cost of a large-scale, transactional application
using Amazon DynamoDB that only needs to store data for 2 days before it is
deleted. In looking at the tables, a Database Specialist notices that much of the
data is months old, and goes back to when the application was first deployed.
What can the Database Specialist do to reduce the overall cost?

Create a new attribute in each table to track the expiration time and enable DynamoDB Streams on each table.

Create an Amazon CloudWatch Events event to export the data to Amazon S3 daily using AWS Data Pipeline and then truncate the Amazon DynamoDB table.

Create a new attribute in each table to track the expiration time and create an AWS Glue transformation to delete entries more than 2 days old.

Create a new attribute in each table to track the expiration time and enable time to live (TTL) on each table.

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15. A Database Specialist migrated an existing production MySQL database from onpremises to an Amazon RDS for MySQL DB instance. However, after the migration,
the database needed to be encrypted at rest using AWS KMS. Due to the size of
the database, reloading, the data into an encrypted database would be too timeconsuming, so it is not an option. How should the Database Specialist satisfy this
new requirement?

Modify the RDS DB instance. Enable the AWS KMS encryption option that leverages the AWS CLI.

Restore an unencrypted snapshot into a MySQL RDS DB instance that is encrypted.

Create a snapshot of the unencrypted RDS DB instance. Create an encrypted copy of the unencrypted snapshot. Restore the encrypted snapshot copy.

Create an encrypted read replica of the RDS DB instance. Promote it the master.

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16. A Database Specialist has migrated an on-premises Oracle database to Amazon
Aurora PostgreSQL. The schema and the data have been migrated successfully.
The on-premises database server was also being used to run database
maintenance cron jobs written in Python to perform tasks including data purging
and generating data exports. The logs for these jobs show that, most of the time,
the jobs completed within 5 minutes, but a few jobs took up to 10 minutes to
complete. These maintenance jobs need to be set up for Aurora PostgreSQL. How
can the Database Specialist schedule these jobs so the setup requires minimal
maintenance and provides high availability?

Create cron jobs on an Amazon EC2 instance to run the maintenance jobs following the required schedule.

Create the maintenance job using the Amazon CloudWatch job scheduling plugin

Create AWS Lambda functions to run the maintenance jobs and schedule them with Amazon CloudWatch Events.

Connect to the Aurora host and create cron jobs to run the maintenance jobs following the required schedule.

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17. A company is hosting critical business data in an Amazon Redshift cluster. Due to
the sensitive nature of the data, the cluster is encrypted at rest using AWS KMS. As
a part of disaster recovery requirements, the company needs to copy the Amazon
Redshift snapshots to another Region. Which steps should be taken in the AWS
Management Console to meet the disaster recovery requirements?

Create a new KMS customer master key in the destination Region and create a new IAM role with access to the new KMS key. Enable Amazon Redshift crossRegion replication in the source Region and use the KMS key of the destination Region

Create a new KMS customer master key in the source Region. Switch to the destination Region, enable Amazon Redshift cross-Region snapshots, and use the KMS key of the source Region.

Create a new IAM role with access to the KMS key. Enable Amazon Redshift crossRegion replication using the new IAM role, and use the KMS key of the source Region.

Enable Amazon Redshift cross-Region snapshots in the source Region, and create a snapshot copy grant and use a KMS key in the destination Region.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

18. A company is running a finance application on an Amazon RDS for MySQL DB
instance. The application is governed by multiple financial regulatory agencies.
The RDS DB instance is set up with security groups to allow access to certain
Amazon EC2 servers only. AWS KMS is used for encryption at rest. Which step will
provide additional security?

Set up RDS to use SSL for data in transit.

Set up NACLs that allow the entire EC2 subnet to access the DB instance.

Disable the master user account.

Set up a security group that blocks SSH to the DB instance.

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19. An online gaming company is planning to launch a new game with Amazon
DynamoDB as its data store. The database should be designated to support the
following use cases: Update scores in real time whenever a player is playing the
game. Retrieve a player's score details for a specific game session. A Database
Specialist decides to implement a DynamoDB table. Each player has a unique
user_id and each game has a unique game_id. Which choice of keys is
recommended for the DynamoDB table?

Create a global secondary index with user_id as the partition key.

Create a composite primary key with user_id as the partition key and game_id as the sort key.

Create a composite primary key with game_id as the partition key and user_id as the sort key.

Create a global secondary index with game_id as the partition key

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20. A company is looking to migrate a 1 TB Oracle database from on-premises to an Amazon Aurora
PostgreSQL DB cluster. The company's Database Specialist discovered that the Oracle database is
storing 100 GB of large binary objects (LOBs) across multiple tables. The Oracle database has a
maximum LOB size of 500 MB with an average LOB size of 350 MB. The Database Specialist has
chosen AWS DMS to migrate the data with the largest replication instances. How should the
Database Specialist optimize the database migration using AWS DMS?

Create two tasks: task1 with LOB tables using full LOB mode with a LOB chunk size of 500 MB and task2 without LOBs.

Create a single task using full LOB mode with a LOB chunk size of 500 MB to migrate the data and LOBs together.

Create two tasks: task1 with LOB tables using limited LOB mode with a maximum LOB size of 500 MB and task 2 without LOBs.

Create a single task using limited LOB mode with a maximum LOB size of 500 MB to migrate data and LOBs together.

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21. A company is load testing its three-tier production web application deployed with
an AWS CloudFormation template on AWS. The Application team is making
changes to deploy additional Amazon EC2 and AWS Lambda resources to expand
the load testing capacity. A Database Specialist wants to ensure that the changes
made by the Application team will not change the Amazon RDS database
resources already deployed. Which combination of steps would allow the
Database Specialist to accomplish this? (Choose two.)

Review the stack drift before modifying the template.

Create and review a change set before applying it.

Export the database resources as stack outputs

Set a stack policy for the database resources.

Define the database resources in a nested stack.

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22. A team of Database Specialists is currently investigating performance issues on an
Amazon RDS for MySQL DB instance and is reviewing related metrics. The team
wants to narrow the possibilities down to specific database wait events to better
understand the situation. How can the Database Specialists accomplish this?

Create appropriate Amazon CloudWatch dashboards to contain specific periods of time.

Enable the option to push all database logs to Amazon CloudWatch for advanced analysis.

Enable Amazon RDS Performance Insights and review the appropriate dashboard.

Enable Enhanced Monitoring will the appropriate settings.

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23. A company is using Amazon with Aurora Replicas for read-only workload scaling.
A Database Specialist needs to split up two read-only applications so each
application always connects to a dedicated replica. The Database Specialist wants
to implement load balancing and high availability for the read-only applications.
Which solution meets these requirements?

Use a specific instance endpoint for each replica and add the instance endpoint to each read-only application connection string

Use custom endpoints for the two read-only applications.

Use a reader endpoint for one read-only application and use an instance endpoint for the other read-only application

Use reader endpoints for both the read-only workload applications.

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24. After restoring an Amazon RDS snapshot from 3 days ago, a company's
Development team cannot connect to the restored RDS DB instance. What is the
likely cause of this problem?

The restored DB instance does not have Enhanced Monitoring enabled.

The production DB instance is using a custom option group.

The restored DB instance is using the default security group.

The production DB instance is using a custom parameter group.

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25. A company has an on-premises system that tracks various database operations
that occur over the lifetime of a database, including database shutdown, deletion,
creation, and backup. The company recently moved two databases to Amazon
RDS and is looking at a solution that would satisfy these requirements. The data
could be used by other systems within the company. Which solution will meet
these requirements with minimal effort?

Create RDS event subscriptions. Have the tracking systems subscribe to specific RDS event system notifications.

Create an AWS Lambda function to trigger on AWS CloudTrail API calls. Filter on specific RDS API calls and write the output to the tracking systems

Write RDS logs to Amazon Kinesis Data Firehose. Create an AWS Lambda function to act on these rules and write the output to the tracking systems.

Create an Amazon Cloudwatch Events rule with the operations that need to be tracked on Amazon RDS. Create an AWS Lambda function to act on these rules and write the output to the tracking systems.

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26. A company is closing one of its remote data centers. This site runs a 100 TB onpremises data warehouse solution. The company plans to use the AWS Schema
Conversion Tool (AWS SCT) and AWS DMS for the migration to AWS. The site
network bandwidth is 500 Mbps. A Database Specialist wants to migrate the onpremises data using Amazon S3 as the data lake and Amazon Redshift as the data
warehouse. This move must take place during a 2-week period when source
systems are shut down for maintenance. The data should stay encrypted at rest
and in transit. Which approach has the least risk and the highest likelihood of a
successful data transfer?

Set up a VPN tunnel for encrypting data over the network from the data center to AWS. Leverage AWS SCT and apply the converted schema to Amazon Redshift. Once complete, start an AWS DMS task to move the data from the source to Amazon S3. Use AWS Glue to load the data from Amazon S3 to Amazon Redshift.

Leverage AWS SCT and apply the converted schema to Amazon Redshift. Once complete, use a fleet of 10 TB dedicated encrypted drives using the AWS Import/Export feature to copy data from on-premises to Amazon S3 with AWS KMS encryption. Use AWS Glue to load the data to Amazon redshift.

Leverage AWS SCT and apply the converted schema to Amazon Redshift. Start an AWS DMS task with two AWS Snowball Edge devices to copy data from onpremises to Amazon S3 with AWS KMS encryption. Use AWS DMS to finish copying data to Amazon Redshift.

Set up a VPN tunnel for encrypting data over the network from the data center to AWS. Leverage a native database export feature to export the data and compress the files. Use the aws S3 cp multiport upload command to upload these files to Amazon S3 with AWS KMS encryption. Once complete, load the data to Amazon Redshift using AWS Glue.

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27. A company wants to migrate its existing on-premises Oracle database to Amazon
Aurora PostgreSQL. The migration must be completed with minimal downtime
using AWS DMS. A Database Specialist must validate that the data was migrated
accurately from the source to the target before the cutover. The migration must
have minimal impact on the performance of the source database. Which approach
will MOST effectively meet these requirements?

Enable AWS DMS data validation on the task so the AWS DMS task compares the source and target records, and reports any mismatches.

Use the table metrics of the AWS DMS task created for migrating the data to verify the statistics for the tables being migrated and to verify that the data definition language (DDL) statements are completed.

Use the AWS Schema Conversion Tool (AWS SCT) to convert source Oracle database schemas to the target Aurora DB cluster. Verify the datatype of the columns

Enable the AWS Schema Conversion Tool (AWS SCT) premigration validation and review the premigration checklist to make sure there are no issues with the conversion.

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28. A gaming company wants to deploy a game in multiple Regions. The company
plans to save local high scores in Amazon DynamoDB tables in each Region. A
Database Specialist needs to design a solution to automate the deployment of the
database with identical configurations in additional Regions, as needed. The
solution should also automate configuration changes across all Regions. Which
solution would meet these requirements and deploy the DynamoDB tables?

Create an AWS CloudFormation template and use a stack set to deploy the template to all the Regions.

Create an AWS CloudFormation template and deploy the template to all the Regions

Create DynamoDB tables using the AWS Management Console in all the Regions and create a step-by- step guide for future deployments.

Create an AWS CLI command to deploy the DynamoDB table to all the Regions and save it for future deployments

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29. A media company is using Amazon RDS for PostgreSQL to store user data. The
RDS DB instance currently has a publicly accessible setting enabled and is hosted
in a public subnet. Following a recent AWS Well-Architected Framework review, a
Database Specialist was given new security requirements. Only certain onpremises corporate network IPs should connect to the DB instance. Connectivity is
allowed from the corporate network only. Which combination of steps does the
Database Specialist need to take to meet these new requirements? (Choose three.)

Connect to the DB instance using private IPs and a VPN

Move the DB instance to a private subnet using AWS DMS.

Modify the pg_hba.conf file. Add the required corporate network IPs and remove the unwanted IPs.

Disable the publicly accessible setting.

Modify the associated security group. Add the required corporate network IPs and remove the unwanted IPs.

Enable VPC peering between the application host running on the corporate network and the VPC associated with the DB instance.

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30. A company is about to launch a new product, and test databases must be recreated from production data. The company runs its production databases on an
Amazon Aurora MySQL DB cluster. A Database Specialist needs to deploy a
solution to create these test databases as quickly as possible with the least
amount of administrative effort. What should the Database Specialist do to meet
these requirements?

Create logical dumps of the production cluster and restore them into new test clusters.

Restore a snapshot from the production cluster into test clusters

Use database cloning to create clones of the production cluster.

Add an additional read replica to the production cluster and use that node for testing.

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31. A company maintains several databases using Amazon RDS for MySQL and
PostgreSQL. Each RDS database generates log files with retention periods set to
their default values. The company has now mandated that database logs be
maintained for up to 90 days in a centralized repository to facilitate real-time and
after- the-fact analyses. What should a Database Specialist do to meet these
requirements with minimal effort?

Create an AWS Lambda function to pull logs from the RDS databases and consolidate the log files in an Amazon S3 bucket. Set a lifecycle policy to expire the objects after 90 days.

Write a stored procedure in each RDS database to download the logs and consolidate the log files in an Amazon S3 bucket. Set a lifecycle policy to expire the objects after 90 days

Modify the RDS databases to publish log to Amazon CloudWatch Logs. Change the log retention policy for each log group to expire the events after 90 days.

Create an AWS Lambda function to download the logs from the RDS databases and publish the logs to Amazon CloudWatch Logs. Change the log retention policy for the log group to expire the events after 90 days

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32. A financial services company is developing a shared data service that supports
different applications from throughout the company. A Database Specialist
designed a solution to leverage Amazon ElastiCache for Redis with cluster mode
enabled to enhance performance and scalability. The cluster is configured to listen
on port 6379. Which combination of steps should the Database Specialist take to
secure the cache data and protect it from unauthorized access? (Choose three.)

Ensure the security group for the ElastiCache clients authorize inbound TCP port 6379 and port 22 traffic from the trusted ElastiCache cluster's security group.

Create an IAM policy to allow the application service roles to access all ElastiCache API actions.

Ensure that Amazon CloudWatch metrics are configured in the ElastiCache cluster

Ensure the security group for the ElastiCache cluster allows all inbound traffic from itself and inbound traffic on TCP port 6379 from trusted clients only.

Enable in-transit and at-rest encryption on the ElastiCache cluster.

Ensure the cluster is created with the auth-token parameter and that the parameter is used in all subsequent commands.

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33. A company is using an Amazon Aurora PostgreSQL DB cluster with an xlarge
primary instance master and two large Aurora Replicas for high availability and
read-only workload scaling. A failover event occurs and application performance is
poor for several minutes. During this time, application servers in all Availability
Zones are healthy and responding normally. What should the company do to
eliminate this application performance issue?

Configure both of the Aurora Replicas to the same instance class as the primary DB instance. Enable cache coherence on the DB cluster, set the primary DB instance failover priority to tier-0, and assign a failover priority of tier-1 to the replicas.

Configure both Aurora Replicas to have the same instance class as the primary DB instance. Implement Aurora PostgreSQL DB cluster cache management. Set the failover priority to tier-0 for the primary DB instance and to tier-1 for the replicas.

Configure one Aurora Replica to have the same instance class as the primary DB instance. Implement Aurora PostgreSQL DB cluster cache management. Set the failover priority to tier-0 for the primary DB instance and one replica with the same instance class. Set the failover priority to tier-1 for the other replicas.

Deploy an AWS Lambda function that calls the DescribeDBInstances action to establish which instance has failed, and then use the PromoteReadReplica operation to promote one Aurora Replica to be the primary DB instance. Configure an Amazon RDS event subscription to send a notification to an Amazon SNS topic to which the Lambda function is subscribed

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34. A company is planning to close for several days. A Database Specialist needs to
stop all applications along with the DB instances to ensure employees do not have
access to the systems during this time. All databases are running on Amazon RDS
for MySQL. The Database Specialist wrote and executed a script to stop all the DB
instances. When reviewing the logs, the Database Specialist found that Amazon
RDS DB instances with read replicas did not stop. How should the Database
Specialist edit the script to fix this issue?

Delete each read replica before stopping its corresponding source instance.

Stop the source instances before stopping their read replicas.

Stop the read replicas before stopping their source instances.

Use the AWS CLI to stop each read replica and source instance at the same time.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

35. A Database Specialist is creating Amazon DynamoDB tables, Amazon CloudWatch alarms, and
associated infrastructure for an Application team using a development AWS account. The team
wants a deployment method that will standardize the core solution components while managing
environment-specific settings separately, and wants to minimize rework due to configuration errors.
Which process should the Database Specialist recommend to meet these requirements?

Create an AWS Lambda function that builds the required objects using an AWS SDK. Set the required parameter values in a test event in the Lambda console for each environment that the Application team can modify, as needed. Deploy the infrastructure by triggering the test event in the console.

Organize common and environmental-specific parameters hierarchically in the AWS Systems Manager Parameter Store, then reference the parameters dynamically from an AWS CloudFormation template. Deploy the CloudFormation stack using the environment name as a parameter.

Create a parameterized AWS CloudFormation template that builds the required objects. Keep separate environment parameter files in separate Amazon S3 buckets. Provide an AWS CLI command that deploys the CloudFormation stack directly referencing the appropriate parameter bucket.

Create a parameterized AWS CloudFormation template that builds the required objects. Import the template into the CloudFormation interface in the AWS Management Console. Make the required changes to the parameters and deploy the CloudFormation stack.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

36. An AWS CloudFormation stack that included an Amazon RDS DB instance was
accidentally deleted and recent data was lost. A Database Specialist needs to add
RDS settings to the CloudFormation template to reduce the chance of accidental
instance data loss in the future. Which settings will meet this requirement?
(Choose three.)

Set DeletionProtection to True

Set DeletionPolicy to Delete.

Set MultiAZ to True.

Set DeleteAutomatedBackups to False.

Set TerminationProtection to True.

Set DeletionPolicy to Retain.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

37. A Database Specialist is migrating a 2 TB Amazon RDS for Oracle DB instance to
an RDS for PostgreSQL DB instance using AWS DMS. The source RDS Oracle DB
instance is in a VPC in the us-east-1 Region. The target RDS for PostgreSQL DB
instance is in a VPC in the use-west-2 Region. Where should the AWS DMS
replication instance be placed for the MOST optimal performance?

In the same Region and VPC as the target DB instance.

In the same Region and VPC of the source DB instance.

In the same VPC and Availability Zone as the target DB instance

In the same VPC and Availability Zone as the source DB instance.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

38. 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?

Use a blue-green deployment with a complete application-level failover test.

Use RDS fault injection queries to simulate the primary node failure

Add a rule to the NACL to deny all traffic on the subnets associated with a single Availability Zone

Use the RDS console to reboot the DB instance by choosing the option to reboot with failover.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

39. A company has deployed an e-commerce web application in a new AWS account. An Amazon RDS
for MySQL Multi-AZ DB instance is part of this deployment with a database-1.xxxxxxxxxxxx.us-east1.rds.amazonaws.com endpoint listening on port 3306. The company's Database Specialist is able
to log in to MySQL and run queries from the bastion host using these details. When users try to
utilize the application hosted in the AWS account, they are presented with a generic error message.
The application servers are logging a 'could not connect to server: Connection times out' error
message to Amazon CloudWatch Logs. What is the cause of this error?

The security group assigned to the application servers does not have the necessary rules to allow inbound connections from the DB instance.

The user name and password the application is using are incorrect.

The security group assigned to the DB instance does not have the necessary rules to allow inbound connections from the application servers.

The user name and password are correct, but the user is not authorized to use the DB instance.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

40. A company is running its line of business application on AWS, which uses Amazon
RDS for MySQL at the persistent data store. The company wants to minimize
downtime when it migrates the database to Amazon Aurora. Which migration
method should a Database Specialist use?

Make a backup of the RDS for MySQL DB instance using the mysqldump utility, create a new Aurora DB cluster, and restore the backup.

Take a snapshot of the RDS for MySQL DB instance and create a new Aurora DB cluster with the option to migrate snapshots.

Create an Aurora Replica from the RDS for MySQL DB instance and promote the Aurora DB cluster.

Create a clone of the RDS for MySQL DB instance and promote the Aurora DB cluster.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

41. A clothing company uses a custom ecommerce application and a PostgreSQL
database to sell clothes to thousands of users from multiple countries. The
company is migrating its application and database from its on- premises data
center to the AWS Cloud. The company has selected Amazon EC2 for the
application and Amazon RDS for PostgreSQL for the database. The company
requires database passwords to be changed every 60 days. A Database Specialist
needs to ensure that the credentials used by the web application to connect to the
database are managed securely. Which approach should the Database Specialist
take to securely manage the database credentials?

Configure IAM database authentication for the application to connect to the database. Create an IAM user and map it to a separate database user for each ecommerce user. Require users to update their passwords every 60 days.

Store the credentials in AWS Secrets Manager. Restrict permissions on the secret to only the IAM role associated with the instance profile. Modify the application to retrieve the credentials from Secrets Manager on start up. Configure the rotation interval to 60 days.

Store the credentials in a text file in an Amazon S3 bucket. Restrict permissions on the bucket to the IAM role associated with the instance profile only. Modify the application to download the text file and retrieve the credentials on start up. Update the text file every 60 days.

Store the credentials in an encrypted text file in the application AMI. Use AWS KMS to store the key for decrypting the text file. Modify the application to decrypt the text file and retrieve the credentials on start up. Update the text file and publish a new AMI every 60 days.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

42. A manufacturing company's website uses an Amazon Aurora PostgreSQL DB
cluster. Which configurations will result in the LEAST application downtime during
a failover? (Choose three.)

Set Java DNS caching timeouts to a high value.

Set TCP keepalive parameters to a high value

Edit and enable Aurora DB cluster cache management in parameter groups

Create an Amazon CloudWatch alert triggering a restore in another Availability Zone when the primary Aurora DB cluster is unreachable.

Set JDBC connection string timeout variables to a low value.

Use the provided read and write Aurora endpoints to establish a connection to the Aurora DB cluster.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

43. A Database Specialist is setting up a new Amazon Aurora DB cluster with one
primary instance and three Aurora Replicas for a highly intensive, business-critical
application. The Aurora DB cluster has one medium- sized primary instance, one
large-sized replica, and two medium sized replicas. The Database Specialist did
not assign a promotion tier to the replicas. In the event of a primary failure, what
will occur?

Aurora will promote the largest-sized Aurora Replica.

Aurora will promote an Aurora Replica that is of the same size as the primary instance

Aurora will not promote an Aurora Replica.

Aurora will promote an arbitrary Aurora Replica.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

44. The Security team for a finance company was notified of an internal security
breach that happened 3 weeks ago. A Database Specialist must start producing
audit logs out of the production Amazon Aurora PostgreSQL cluster for the
Security team to use for monitoring and alerting. The Security team is required to
perform real-time alerting and monitoring outside the Aurora DB cluster and
wants to have the cluster push encrypted files to the chosen solution. Which
approach will meet these requirements?

Use pg_audit to generate audit logs and send the logs to the Security team.

Set up database activity streams and connect the data stream from Amazon Kinesis to consumer applications

Use AWS CloudTrail to audit the DB cluster and the Security team will get data from Amazon S3.

Turn on verbose logging and set up a schedule for the logs to be dumped out for the Security team.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

45. A company is deploying a solution in Amazon Aurora by migrating from an onpremises system. The IT department has established an AWS Direct Connect link
from the company's data center. The company's Database Specialist has selected
the option to require SSL/TLS for connectivity to prevent plaintext data from being
set over the network. The migration appears to be working successfully, and the
data can be queried from a desktop machine. Two Data Analysts have been asked
to query and validate the data in the new Aurora DB cluster. Both Analysts are
unable to connect to Aurora. Their user names and passwords have been verified
as valid and the Database Specialist can connect to the DB cluster using their
accounts. The Database Specialist also verified that the security group
configuration allows network from all corporate IP addresses. What should the
Database Specialist do to correct the Data Analysts' inability to connect?

Instruct the Data Analysts to download the root certificate and use the SSL certificate on the connection string to connect.

Modify the Data Analysts' local client firewall to allow network traffic to AWS.

Add explicit mappings between the Data Analysts' IP addresses and the instance in the security group assigned to the DB cluster.

Restart the DB cluster to apply the SSL change.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

46. A gaming company has implemented a leaderboard in AWS using a Sorted Set
data structure within Amazon ElastiCache for Redis. The ElastiCache cluster has
been deployed with cluster mode disabled and has a replication group deployed
with two additional replicas. The company is planning for a worldwide gaming
event and is anticipating a higher write load than what the current cluster can
handle. Which method should a Database Specialist use to scale the ElastiCache
cluster ahead of the upcoming event?

Create an additional ElastiCache cluster and load-balance traffic between the two clusters.

Enable cluster mode on the existing ElastiCache cluster and configure separate shards for the Sorted Set across all nodes in the cluster.

Increase the size of the ElastiCache cluster nodes to a larger instance size

Use the EXPIRE command and set a higher time to live (TTL) after each call to increment a given key

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

47. A company has a database monitoring solution that uses Amazon CloudWatch for
its Amazon RDS for SQL Server environment. The cause of a recent spike in CPU
utilization was not determined using the standard metrics that were collected. The
CPU spike caused the application to perform poorly, impacting users. A Database
Specialist needs to determine what caused the CPU spike. Which combination of
steps should be taken to provide more visibility into the processes and queries
running during an increase in CPU load? (Choose two.)

Implement a caching layer to help with repeated queries on the RDS SQL Server DB instance.

Enable Amazon RDS Performance Insights to view the database load and filter the load by waits, SQL statements, hosts, or users.

Enable Amazon CloudWatch Events and view the incoming T-SQL statements causing the CPU to spike.

Use Amazon QuickSight to view the SQL statement being run.

Enable Enhanced Monitoring metrics to view CPU utilization at the RDS SQL Server DB instance level.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

48. A Database Specialist is planning to create a read replica of an existing Amazon
RDS for MySQL Multi-AZ DB instance. When using the AWS Management Console
to conduct this task, the Database Specialist discovers that the source RDS DB
instance does not appear in the read replica source selection box, so the read
replica cannot be created. What is the most likely reason for this?

The minor MySQL version in the source DB instance does not support read replicas.

The source DB instance has to be converted to Single-AZ first to create a read replica from it.

Automated backups are not enabled on the source DB instance.

Enhanced Monitoring is not enabled on the source DB instance.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

49. A company has a production Amazon Aurora Db cluster that serves both online
transaction processing (OLTP) transactions and compute-intensive reports. The
reports run for 10% of the total cluster uptime while the OLTP transactions run all
the time. The company has benchmarked its workload and determined that a sixnode Aurora DB cluster is appropriate for the peak workload. The company is now
looking at cutting costs for this DB cluster, but needs to have a sufficient number
of nodes in the cluster to support the workload at different times. The workload
has not changed since the previous benchmarking exercise. How can a Database
Specialist address these requirements with minimal user involvement?

Split up the DB cluster into two different clusters: one for OLTP and the other for reporting. Monitor and set up replication between the two clusters to keep data consistent

Review all evaluate the peak combined workload. Ensure that utilization of the DB cluster node is at an acceptable level. Adjust the number of instances, if necessary.

Set up automatic scaling on the DB cluster. This will allow the number of reader nodes to adjust automatically to the reporting workload, when needed.

Use the stop cluster functionality to stop all the nodes of the DB cluster during times of minimal workload. The cluster can be restarted again depending on the workload at the time.

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Category: AWS Certified Database Specialty (DBS-C01) Part 1

50. An ecommerce company has tasked a Database Specialist with creating a
reporting dashboard that visualizes critical business metrics that will be pulled
from the core production database running on Amazon Aurora. Data that is read
by the dashboard should be available within 100 milliseconds of an update. The
Database Specialist needs to review the current configuration of the Aurora DB
cluster and develop a cost-effective solution. The solution needs to accommodate
the unpredictable read workload from the reporting dashboard without any
impact on the write availability and performance of the DB cluster. Which solution
meets these requirements?

Create a separate DB cluster for the new workload, refresh from the source DB cluster, and set up ongoing replication using AWS DMS change data capture (CDC).

Add an automatic scaling policy to the DB cluster to add Aurora Replicas to the cluster based on CPU consumption.

Turn on the serverless option in the DB cluster so it can automatically scale based on demand.

Provision a clone of the existing DB cluster for the new Application team

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AWS DBS-C01 – 50 Past Questions with Answers

Free AWS Certified Database Specialty (DBS-C01). 50 Past Questions with Answers

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