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

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AWS Certified Database Specialty (DBS-C01) Part 1

Free AWS Certified Database Specialty (DBS-C01) Part 1

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1 / 25

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.

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

Re-create global secondary indexes in the new table.

2 / 25

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.

3 / 25

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 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.

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.

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. 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.

4 / 25

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 global tables to synchronize transactions.

Use Amazon Aurora Global Database to synchronize all transactions.

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

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

5 / 25

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.)

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

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

Connect to the DB instance using private IPs and a VPN

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

Disable the publicly accessible setting.

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

6 / 25

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.

Automated backups are not enabled on the source DB instance.

Enhanced Monitoring is not enabled on the source DB instance.

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

7 / 25

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.

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

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

8 / 25

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?

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

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).

9 / 25

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?

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.

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.

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.

10 / 25

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.

Use database cloning to create clones of the production cluster.

Restore a snapshot from the production cluster into test clusters

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

11 / 25

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?

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

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

Reboot the secondary Multi-AZ DB instance.

Select the option to apply the change immediately.

12 / 25

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?

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.

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

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

13 / 25

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.

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

Disable EBS optimization on the DB instance

Increase the size of the DB instance storage.

14 / 25

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?

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.

Stop the source instances before stopping their read replicas.

Delete each read replica before stopping its corresponding source instance.

15 / 25

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.

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.

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.

16 / 25

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 DocumentDB

Amazon DynamoDB global table.

Amazon Aurora Global Database.

Amazon RDS Multi-AZ deployment.

17 / 25

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 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

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.

18 / 25

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 DynamoDB as the database and use Amazon API Gateway

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.

19 / 25

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

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

20 / 25

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 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.

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.

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

21 / 25

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 custom endpoints for the two read-only applications.

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

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

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

22 / 25

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?

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

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.

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.

23 / 25

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.)

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

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

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

Use Amazon QuickSight to view the SQL statement being run.

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

24 / 25

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 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.

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.

25 / 25

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.

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

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

Create the maintenance job using the Amazon CloudWatch job scheduling plugin

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