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

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

1

AWS Certified Database Specialty (DBS-C01) Part 3

AWS Certified Database Specialty (DBS-C01) Part 3
Questions will be picked at random from the question bank.
You can use the NEXT button to move to the next question, use the PREV button to move to the previous question, the CLEAR button to clear any answer of your choice and you have the FINISH button to end the exam if you choose to.
Any question not answered before the end of the exam time, will be marked as wrong and the exam will end by itself. So try to attempt all questions on time.
Goodluck!

1 / 50
A large automobile company is migrating the database of a critical financial
application to Amazon DynamoDB. The company's risk and compliance policy
requires that every change in the database be recorded as a log entry for audits.
The system is anticipating more than 500,000 log entries each minute. Log entries
should be stored in batches of at least 100,000 records in each file in Apache
Parquet format. How should a database specialist implement these requirements
with DynamoDB?
Enable Amazon DynamoDB Streams on the table. Create an AWS Lambda function triggered by the stream. Write the log entries to an Amazon Kinesis Data Firehose delivery stream with buffering and Amazon S3 as the destination.
Create a backup plan in AWS Backup to back up the DynamoDB table once a day. Create an AWS Lambda function that restores the backup in another table and compares both tables for changes. Generate the log entries and write them to an Amazon S3 object.
Enable AWS CloudTrail logs on the table. Create an AWS Lambda function that reads the log files once an hour and filters DynamoDB API actions. Write the filtered log files to Amazon S3.
Enable Amazon DynamoDB Streams on the table. Create an AWS Lambda function triggered by the stream. Write the log entries to an Amazon S3 object.

2 / 50
A gaming company is developing a new mobile game and decides to store the data for each user
in Amazon DynamoDB. To make the registration process as easy as possible, users can log in with
their existing Facebook or Amazon accounts. The company expects more than 10,000 users. How
should a database specialist implement access control with the LEAST operational effort?
Use web identity federation on the mobile app and AWS STS with an attached IAM role to get temporary credentials to access DynamoDB.
Use web identity federation on the mobile app and create individual IAM users with credentials to access DynamoDB.
Use a self-developed user management system on the mobile app that lets users access the data from DynamoDB through an API.
Use a single IAM user on the mobile app to access DynamoDB.

3 / 50
The Amazon CloudWatch metric for FreeLocalStorage on an Amazon Aurora MySQL DB instance
shows that the amount of local storage is below 10 MB. A database engineer must increase the
local storage available in the Aurora DB instance. How should the database engineer meet this
requirement?
Modify the DB instance and configure the required storage volume in the configuration section.
Increase the local storage by upgrading the database engine version.
Modify the Aurora DB cluster to enable automatic volume resizing.
Modify the DB instance to use an instance class that provides more local SSD storage.

4 / 50
A company uses Amazon Aurora for secure financial transactions. The data must always be
encrypted at rest and in transit to meet compliance requirements. Which combination of actions
should a database specialist take to meet these requirements? (Choose two.)
Use SSL/TLS to secure the in-transit connection between the financial application and the Aurora DB cluster.
Use AWS Key Management Service (AWS KMS) to secure the in-transit connection between the financial application and the Aurora DB cluster.
Take a snapshot of the Aurora DB cluster and encrypt the snapshot using an AWS Key Management Service (AWS KMS) encryption key. Restore the snapshot to a new DB cluster and update the financial application database endpoints.
Modify the existing Aurora DB cluster and enable encryption using an AWS Key Management Service (AWS KMS) encryption key. Apply the changes immediately.
Create an Aurora Replica with encryption enabled using AWS Key Management Service (AWS KMS). Then promote the replica to master.

5 / 50
A database specialist deployed an Amazon RDS DB instance in Dev-VPC1 used by
their development team. Dev-VPC1 has a peering connection with Dev-VPC2 that
belongs to a different development team in the same department. The networking
team confirmed that the routing between VPCs is correct; however, the database
engineers in Dev-VPC2 are getting a timeout connections error when trying to
connect to the database in Dev-VPC1. What is likely causing the timeouts?
The database is deployed in a VPC that is in a different Region.
The database is deployed with misconfigured security groups
The database is deployed in a VPC that is in a different Availability Zone.
The database is deployed with the wrong client connect timeout configuration

6 / 50
A company uses an Amazon RDS for PostgreSQL DB instance for its customer relationship
management (CRM) system. New compliance requirements specify that the database must be
encrypted at rest. Which action will meet these requirements?
Create an encrypted read replica of the DB instance. Promote the read replica to a standalone instance.
Create an encrypted copy of manual snapshot of the DB instance. Restore a new DB instance from the encrypted snapshot.
Restore a DB instance from the most recent automated snapshot and enable encryption.
Modify the DB instance and enable encryption

7 / 50
An online advertising website uses an Amazon DynamoDB table with on-demand capacity mode as
its data store. The website also has a DynamoDB Accelerator (DAX) cluster in the same VPC as its
web application server. The application needs to perform infrequent writes and many strongly
consistent reads from the data store by querying the DAX cluster. During a performance audit, a
systems administrator notices that the application can look up items by using the DAX cluster.
However, the QueryCacheHits metric for the DAX cluster consistently shows 0 while the
QueryCacheMisses metric continuously keeps growing in Amazon CloudWatch. What is the MOST
likely reason for this occurrence?
A VPC endpoint was not added to access CloudWatch.
Strongly consistent reads are always passed through DAX to DynamoDB.
DynamoDB is scaling due to a burst in traffic, resulting in degraded performance
A VPC endpoint was not added to access DynamoDB.

8 / 50
A company is using a Single-AZ Amazon RDS for MySQL DB instance for development. The DB
instance is experiencing slow performance when queries are executed. Amazon CloudWatch metrics
indicate that the instance requires more I/ O capacity. Which actions can a database specialist
perform to resolve this issue? (Choose two.)
Change to a database instance class with higher throughput.
Convert from Single-AZ to Multi-AZ.
Restart the application tool used to execute queries.
Increase the I/O parameter in Amazon RDS Enhanced Monitoring.
Convert from General Purpose to Provisioned IOPS (PIOPS).

9 / 50
A company migrated one of its business-critical database workloads to an Amazon Aurora Multi-AZ
DB cluster. The company requires a very low RTO and needs to improve the application recovery
time after database failovers. Which approach meets these requirements?
Set the max_connections parameter to 16,000 in the instance-level parameter group.
Create an Amazon RDS Proxy database proxy and update client connections to point to the proxy endpoint
Modify the client connection timeout to 300 seconds.
Enable the query cache at the instance level.

10 / 50
A company has an application that uses an Amazon DynamoDB table to store user data. Every
morning, a single-threaded process calls the DynamoDB API Scan operation to scan the entire table
and generate a critical start-of-day report for management. A successful marketing campaign
recently doubled the number of items in the table, and now the process takes too long to run and
the report is not generated in time. A database specialist needs to improve the performance of the
process. The database specialist notes that, when the process is running, 15% of the table’s
provisioned read capacity units (RCUs) are being used. What should the database specialist do?
Enable auto scaling for the DynamoDB table.
Set the Limit and Offset parameters before every call to the API
Double the table’s provisioned RCUs.
Use four threads and parallel DynamoDB API Scan operations

11 / 50
A company is moving its fraud detection application from on premises to the AWS Cloud and is
using Amazon Neptune for data storage. The company has set up a 1 Gbps AWS Direct Connect
connection to migrate 25 TB of fraud detection data from the on-premises data center to a
Neptune DB instance. The company already has an Amazon S3 bucket and an S3 VPC endpoint,
and 80% of the company’s network bandwidth is available. How should the company perform this
data load?
Use the AWS CLI to transfer the data from on premises to the S3 bucket. Use the Copy command for Neptune to move the data in bulk from the S3 bucket to the Neptune DB instance.
Use AWS DataSync to transfer the data from on premises to the S3 bucket. Use the Loader command for Neptune to move the data in bulk from the S3 bucket to the Neptune DB instance
Use AWS Database Migration Service (AWS DMS) to transfer the data from on premises to the S3 bucket. Use the Loader command for Neptune to move the data in bulk from the S3 bucket to the Neptune DB instance
Use an AWS SDK with a multipart upload to transfer the data from on premises to the S3 bucket. Use the Copy command for Neptune to move the data in bulk from the S3 bucket to the Neptune DB instance.

12 / 50
A financial company recently launched a portfolio management solution. The backend of the
application is powered by Amazon Aurora with MySQL compatibility. The company requires an RTO
of 5 minutes and an RPO of 5 minutes. A database specialist must configure an efficient disaster
recovery solution with minimal replication lag. Which approach should the database specialist take
to meet these requirements?
Configure a cross-Region read replica.
Configure a binlog and create a replica in a different AWS Region
Configure AWS Database Migration Service (AWS DMS) and create a replica in a different AWS Region.
Configure an Amazon Aurora global database and add a different AWS Region

13 / 50
A large company has a variety of Amazon DB clusters. Each of these clusters has various
configurations that adhere to various requirements. Depending on the team and use case, these
configurations can be organized into broader categories. A database administrator wants to make
the process of storing and modifying these parameters more systematic. The database
administrator also wants to ensure that changes to individual categories of configurations are
automatically applied to all instances when required. Which AWS service or feature will help
automate and achieve this objective?
AWS Secrets Manager.
AWS Config.
AWS Systems Manager Parameter Store.
DB parameter group.

14 / 50
A company wants to migrate its Microsoft SQL Server Enterprise Edition database instance from onpremises to AWS. A deep review is performed and the AWS Schema Conversion Tool (AWS SCT)
provides options for running this workload on Amazon RDS for SQL Server Enterprise Edition,
Amazon RDS for SQL Server Standard Edition, Amazon Aurora MySQL, and Amazon Aurora
PostgreSQL. The company does not want to use its own SQL server license and does not want to
change from Microsoft SQL Server What is the MOST cost-effective and operationally efficient
solution?
Run SQL Server Enterprise Edition on Amazon EC2.
Run SQL Server Enterprise Edition on Amazon RDS
Run Amazon Aurora MySQL leveraging SQL Server on Linux compatibility libraries
Run SQL Server Standard Edition on Amazon RDS.

15 / 50
A database specialist must create nightly backups of an Amazon DynamoDB table in a missioncritical workload as part of a disaster recovery strategy. Which backup methodology should the
database specialist use to MINIMIZE management overhead?
Create an AWS Lambda fts?unction that creates a backup of the DynamoDB table. Create an Amazon CloudWatch Events rule that executes the Lambda function on a nightly basis.
Install the AWS CLI on an Amazon EC2 instance. Write a CLI command that creates a backup of the DynamoDB table. Create a scheduled job or task that executes the command on a nightly basis
Configure DynamoDB backup and restore for an on-demand backup frequency of every 24 hours
Create a backup plan using AWS Backup, specify a backup frequency of every 24 hours, and give the plan a nightly backup window.

16 / 50
A large gaming company is creating a centralized solution to store player session state for multiple
online games. The workload required key-value storage with low latency and will be an equal mix of
reads and writes. Data should be written into the AWS Region closest to the user across the games’
geographically distributed user base. The architecture should minimize the amount of overhead
required to manage the replication of data between Regions. Which solution meets these
requirements?
Amazon DynamoDB global tables.
Amazon Aurora global database.
Amazon RDS for MySQL with multi-Region read replicas.
Amazon RDS for Oracle with GoldenGate.

17 / 50
A company is developing a new web application. An AWS CloudFormation template was created as
a part of the build process. Recently, a change was made to an AWS::RDS::DBInstance resource in
the template. The CharacterSetName property was changed to allow the application to process
international text. A change set was generated using the new template, which indicated that the
existing DB instance should be replaced during an upgrade. What should a database specialist do
to prevent data loss during the stack upgrade?
Modify the stack policy using the aws cloudformation update-stack command and the set-stackpolicy command, then make the DB resource protected
Deactivate any applications that are using the DB instance. Create a snapshot of the DB instance. Modify the template to add the DBSnapshotIdentifier property with the ID of the DB snapshot. Update the stack and reactivate theapplications.
Create a snapshot of the DB instance. Modify the template to add the DBSnapshotIdentifier property with the ID of the DB snapshot. Update the stack.
Create a snapshot of the DB instance. Update the stack. Restore the database to a new instance.

18 / 50
A company is using Amazon Aurora PostgreSQL for the backend of its application.
The system users are complaining that the responses are slow. A database
specialist has determined that the queries to Aurora take longer during peak
times. With the Amazon RDS Performance Insights dashboard, the load in the
chart for average active sessions is often above the line that denotes maximum
CPU usage and the wait state shows that most wait events are IO:XactSync. What
should the company do to resolve these performance issues?
Modify applications to avoid conflicts by taking locks.
Modify applications to commit transactions in batches.
Add an Aurora Replica to scale the read traffic.
Scale up the DB instance class

19 / 50
A company is running a website on Amazon EC2 instances deployed in multiple Availability Zones
(AZs). The site performs a high number of repetitive reads and writes each second on an Amazon
RDS for MySQL Multi-AZ DB instance with General Purpose SSD (gp2) storage. After
comprehensive testing and analysis, a database specialist discovers that there is high read latency
and high CPU utilization on the DB instance. Which approach should the database specialist to take
to resolve this issue without changing the application?
Modify the RDS for MySQL database class to a bigger size and implement Provisioned IOPS (PIOPS).
Implementing sharding to distribute the load to multiple RDS for MySQL databases.
Use the same RDS for MySQL instance class with Provisioned IOPS (PIOPS) storage.
Add an RDS for MySQL read replica.

20 / 50
A company has an ecommerce web application with an Amazon RDS for MySQL DB instance. The
marketing team has noticed some unexpected updates to the product and pricing information on
the website, which is impacting sales targets. The marketing team wants a database specialist to
audit future database activity to help identify how and when the changes are being made. What
should the database specialist do to meet these requirements? (Choose two.)
Enable auditing of CONNECT and QUERY_DML events.
Publish the database logs to Amazon CloudWatch Logs.
Enable Enhanced Monitoring on the DB instance.
SSH to the DB instance and review the database logs.
Create an RDS event subscription to the audit event type.

21 / 50
A company is using an Amazon RDS for MySQL DB instance for its internal applications. A security
audit shows that the DB instance is not encrypted at rest. The company’s application team needs to
encrypt the DB instance. What should the team do to meet this requirement?
Stop the DB instance and create a snapshot. Copy the snapshot into another encrypted snapshot. Restore the encrypted snapshot to a new encrypted DB instance. Delete the original DB instance, and update the applications to point to thenew encrypted DB instance.
Stop the DB instance and create an encrypted snapshot. Restore the encrypted snapshot to a new encrypted DB instance. Delete the original DB instance, and update the applications to point to the new encrypted DB instance.
Create an encrypted read replica of the DB instance. Promote the read replica to master. Delete the original DB instance, and update the applications to point to the new encrypted DB instance.
Stop the DB instance and modify it to enable encryption. Apply this setting immediately without waiting for the next scheduled RDS maintenance window.

22 / 50
A large retail company recently migrated its three-tier ecommerce applications to AWS. The
company’s backend database is hosted on Amazon Aurora PostgreSQL. During peak times, users
complain about longer page load times. A database specialist reviewed Amazon RDS Performance
Insights and found a spike in IO:XactSync wait events. The SQL attached to the wait events are all
single INSERT statements. How should this issue be resolved?
Change the Aurora DB cluster storage to Provisioned IOPS (PIOPS).
Add an Amazon ElastiCache for Redis cluster and change the application to write through.
Add a new Aurora Replica to the Aurora DB cluster
Modify the application to commit transactions in batches

23 / 50
A company wants to migrate its on-premises MySQL databases to Amazon RDS for MySQL. To
comply with the company’s security policy, all databases must be encrypted at rest. RDS DB
instance snapshots must also be shared across various accounts to provision testing and staging
environments. Which solution meets these requirements?
Create an RDS for MySQL DB instance with an AWS Key Management Service (AWS KMS) customer managed CMK. Update the key policy to include the Amazon Resource Name (ARN) of the other AWS accounts as a principal, andthen allow the kms:CreateGrant action.
Create an RDS for MySQL DB instance with an AWS CloudHSM key. Update the key policy to include the Amazon Resource Name (ARN) of the other AWS accounts as a principal, and then allow the kms:CreateGrant action.
Create an RDS for MySQL DB instance with an AWS owned CMK. Create a new key policy to include the administrator user name of the other AWS accounts as a principal, and then allow the kms:CreateGrant action
Create an RDS for MySQL DB instance with an AWS managed CMK. Create a new key policy to include the Amazon Resource Name (ARN) of the other AWS accounts as a principal, and then allow the kms:CreateGrant action.

24 / 50
A company is releasing a new mobile game featuring a team play mode. As a
group of mobile device users play together, an item containing their statuses is
updated in an Amazon DynamoDB table. Periodically, the other users’ devices read
the latest statuses of their teammates from the table using the BatchGetltemn
operation. Prior to launch, some testers submitted bug reports claiming that the
status data they were seeing in the game was not up-to-date. The developers are
unable to replicate this issue and have asked a database specialist for a
recommendation. Which recommendation would resolve this issue?
Ensure the BatchGetltem operation is called with the ConsistentRead parameter set to false.
Enable a stream on the DynamoDB table and subscribe each device to the stream to ensure all devices receive up-to-date status information.
Ensure the DynamoDB table is configured to be always consistent.
Ensure the BatchGetltem operation is called with the ConsistentRead parameter set to true.

25 / 50
A ride-hailing application uses an Amazon RDS for MySQL DB instance as persistent storage for
bookings. This application is very popular and the company expects a tenfold increase in the user
base in next few months. The application experiences more traffic during the morning and evening
hours. This application has two parts: An in-house booking component that accepts online
bookings that directly correspond to simultaneous requests from users. A third-party customer
relationship management (CRM) component used by customer care representatives. The CRM uses
queries to access booking data. A database specialist needs to design a cost-effective database
solution to handle this workload. Which solution meets these requirements?
Use Amazon DynamoDB to accept the bookings. Enable DynamoDB Streams and associate an AWS Lambda function to capture changes and push the booking data to an Amazon SQS queue. This triggers another Lambda function thatpulls data from Amazon SQS and writes it to the RDS for MySQL DB instance used by the CRM.
Use Amazon ElastiCache for Redis to accept the bookings. Associate an AWS Lambda function to capture changes and push the booking data to the RDS for MySQL DB instance used by the CRM.
Use Amazon DynamoDB to accept the bookings. Enable DynamoDB Streams and associate an AWS Lambda function to capture changes and push the booking data to Amazon Athena, which is used by the CRM.
Use Amazon ElastiCache for Redis to accept the bookings. Associate an AWS Lambda function to capture changes and push the booking data to an Amazon Redshift database used by the CRM.

26 / 50
A company developed a new application that is deployed on Amazon EC2 instances behind an
Application Load Balancer. The EC2 instances use the security group named sg-application-servers.
The company needs a database to store the data from the application and decides to use an
Amazon RDS for MySQL DB instance. The DB instance is deployed in private DB subnet. What is the
MOST restrictive configuration for the DB instance security group?
Only allow incoming traffic from the sg-application-servers security group on port 443.
Only allow incoming traffic from the sg-application-servers security group on port 3306.
Only allow incoming traffic from the subnet of the application servers on port 443.
Only allow incoming traffic from the subnet of the application servers on port 3306.

27 / 50
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 cost-effective solution that will automatically scale and is highly
available. Which solution meets these requirements?
Amazon Aurora with one writer node and two cross-Region Aurora Replicas.
Amazon DynamoDB with provisioned capacity mode with 5,000 write capacity units (WCUs) and 10,000 read capacity units (RCUs).
Amazon DynamoDB with on-demand capacity mode.
Amazon Aurora with one writer node and an Aurora Replica with the parallel query feature enabled

28 / 50
An online shopping company has a large inflow of shopping requests daily. As a result, there is a
consistent load on the company’s Amazon RDS database. A database specialist needs to ensure the
database is up and running at all times. The database specialist wants an automatic notification
system for issues that may cause database downtime or for configuration changes made to the
database. What should the database specialist do to achieve this? (Choose two.)
Enable email notifications for AWS Trusted Adviso
Create an Amazon CloudWatch Events event to send a notification using Amazon SNS on every API call logged in AWS CloudTrail.
Configure Amazon CloudWatch alarms on various metrics, such as FreeStorageSpace for the RDS instance.
Use Amazon SES to send notifications based on configured Amazon CloudWatch Events events.
Subscribe to an RDS event subscription and configure it to use an Amazon SNS topic to send notifications.

29 / 50
A company is running an Amazon RDS for MySQL Multi-AZ DB instance for a
business-critical workload. RDS encryption for the DB instance is disabled. A recent
security audit concluded that all business-critical applications must encrypt data at
rest. The company has asked its database specialist to formulate a plan to
accomplish this for the DB instance. Which process should the database specialist
recommend?
Temporarily shut down the unencrypted DB instance. Enable AWS KMS encryption in the AWS Management Console using an AWS managed CMK. Restart the DB instance in an encrypted state.
Create a new RDS for MySQL DB instance with encryption enabled. Restore the unencrypted snapshot to this DB instance.
Create a snapshot of the unencrypted DB instance. Create an encrypted copy of the snapshot. Restore the DB instance from the encrypted snapshot.
Create an encrypted snapshot of the unencrypted DB instance. Copy the encrypted snapshot to Amazon S3. Restore the DB instance from the encrypted snapshot using Amazon S3.

30 / 50
A company is migrating a mission-critical 2-TB Oracle database from on premises to Amazon
Aurora. The cost for the database migration must be kept to a minimum, and both the on-premises
Oracle database and the Aurora DB cluster must remain open for write traffic until the company is
ready to completely cut over to Aurora. Which combination of actions should a database specialist
take to accomplish this migration as quickly as possible? (Choose two.)
Create an AWS DMS task to migrate data from the Oracle database to the Aurora DB cluster. Once the initial load is complete, create an AWS Kinesis Data Firehose stream to perform change data capture (CDC) until the company isready to move all user traffic to the Aurora DB cluster.
Use the AWS Schema Conversion Tool (AWS SCT) to convert the source database schema. Then restore the converted schema to the target Aurora DB cluster.
Use Oracle’s Data Pump tool to export a copy of the source database schema and manually edit the schema in a text editor to make it compatible with Aurora.
Create an AWS Glue job and related resources to migrate data from the Oracle database to the Aurora DB cluster. Once the initial load is complete, create an AWS DMS task to perform change data capture (CDC) until the company isready to move all user traffic to the Aurora DB cluster.
Create an AWS DMS task to migrate data from the Oracle database to the Aurora DB cluster. Select the migration type to replicate ongoing changes to keep the source and target databases in sync until the company is ready to move alluser traffic to the Aurora DB cluster.

31 / 50
A company’s ecommerce website uses Amazon DynamoDB for purchase orders. Each order is made
up of a Customer ID and an Order ID. The DynamoDB table uses the Customer ID as the partition
key and the Order ID as the sort key. To meet a new requirement, the company also wants the
ability to query the table by using a third attribute named Invoice ID. Queries using the Invoice ID
must be strongly consistent. A database specialist must provide this capability with optimal
performance and minimal overhead. What should the database administrator do to meet these
requirements?
Add a global secondary index on Invoice ID to the existing table.
Add a local secondary index on Invoice ID to the existing table
Recreate the table by using the latest snapshot while adding a local secondary index on Invoice ID
Use the partition key and a FilterExpression parameter with a filter on Invoice ID for all queries.

32 / 50
A banking company recently launched an Amazon RDS for MySQL DB instance as part of a proofof-concept project. A database specialist has configured automated database snapshots. As a part
of routine testing, the database specialist noticed one day that the automated database snapshot
was not created. Which of the following are possible reasons why the snapshot was not created?
(Choose two.)
The RDS maintenance window is not configured.
A copy of the RDS automated snapshot for this DB instance is in progress within the same AWS Region.
RDS event notifications have not been enabled.
OThe RDS DB instance is in the STORAGE_FULL state
A copy of the RDS automated snapshot for this DB instance is in progress in a different AWS Region.

33 / 50
An electric utility company wants to store power plant sensor data in an Amazon
DynamoDB table. The utility company has over 100 power plants and each power
plant has over 200 sensors that send data every 2 seconds. The sensor data
includes time with milliseconds precision, a value, and a fault attribute if the
sensor is malfunctioning. Power plants are identified by a globally unique
identifier. Sensors are identified by a unique identifier within each power plant. A
database specialist needs to design the table to support an efficient method of
finding all faulty sensors within a given power plant. Which schema should the
database specialist use when creating the DynamoDB table to achieve the fastest
query time when looking for faulty sensors?
Create a composite of the plant identifier and sensor identifier as the partition key. Use the measurement time as the sort key. Create a local secondary index (LSI) on the fault attribute
Create a composite of the plant identifier and sensor identifier as the partition key. Use the measurement time as the sort key. Create a global secondary index (GSI) with the plant identifier as the partition key and the fault attribute as thesort key
Use the plant identifier as the partition key and the measurement time as the sort key. Create a global secondary index (GSI) with the plant identifier as the partition key and the fault attribute as the sort key.
Use the plant identifier as the partition key and the sensor identifier as the sort key. Create a local secondary index (LSI) on the fault attribute.

34 / 50
A company uses Amazon DynamoDB as the data store for its ecommerce website. The website
receives little to no traffic at night, and the majority of the traffic occurs during the day. The traffic
growth during peak hours is gradual and predictable on a daily basis, but it can be orders of
magnitude higher than during offpeak hours. The company initially provisioned capacity based on
its average volume during the day without accounting for the variability in traffic patterns. However,
the website is experiencing a significant amount of throttling during peak hours. The company
wants to reduce the amount of throttling while minimizing costs. What should a database specialist
do to meet these requirements?
Use on-demand capacity.
Use provisioned capacity. Set it to the capacity levels required for peak daytime throughput.
Use provisioned capacity. Create an AWS Application Auto Scaling policy to update capacity based on consumption.
Use reserved capacity. Set it to the capacity levels required for peak daytime throughput.

35 / 50
A company has a 20 TB production Amazon Aurora DB cluster. The company runs a large batch job
overnight to load data into the Aurora DB cluster. To ensure the company’s development team has
the most up-to-date data for testing, a copy of the DB cluster must be available in the shortest
possible time after the batch job completes. How should this be accomplished?
Schedule a job to create a clone of the DB cluster at the end of the overnight batch process.
Create a dump file from the DB cluster. Load the dump file into a new DB cluster.
Use the AWS CLI to schedule a manual snapshot of the DB cluster. Restore the snapshot to a new DB cluster using the AWS CLI.
Set up a new daily AWS DMS task that will use cloning and change data capture (CDC) on the DB cluster to copy the data to a new DB cluster. Set up a time for the AWS DMS stream to stop when the new cluster is current.

36 / 50
An online advertising company uses an Amazon DynamoDb table as its data store.
The table has Amazon DynamoDB Streams enabled and has a global secondary
index on one of the keys. The table is encrypted using an AWS Key Management
Service (AWS KMS) customer managed key. The company has decided to expand
its operations globally and wants to replicate the database in a different AWS
Region by using DynamoDB global tables. Upon review, an administrator notices
the following: 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
configurations will block the creation of a global table or the creation of a replica
in the new Region? (Choose two.)
DynamoDB Streams is enabled for the table.
An empty table with the same name exists in the Region where replication is desired.
No role with the dynamodb:CreateGlobalTable permission exists in the account.
The table is encrypted using a KMS customer managed key
A global secondary index with the same partition key but a different sort key exists in the new Region where replication is desired.

37 / 50
A retail company manages a web application that stores data in an Amazon DynamoDB table. The
company is undergoing account consolidation efforts. A database engineer needs to migrate the
DynamoDB table from the current AWS account to a new AWS account. Which strategy meets these
requirements with the LEAST amount of administrative work?
Use AWS Data Pipeline in the current account to export the data from the DynamoDB table to a file in Amazon S3. Use Data Pipeline to import the data from the S3 file to a DynamoDB table in the new account.
Use AWS Glue to crawl the data in the DynamoDB table. Create a job using an available blueprint to export the data to Amazon S3. Import the data from the S3 file to a DynamoDB table in the new account.
Configure Amazon DynamoDB Streams for the DynamoDB table in the current account. Create an AWS Lambda function to read from the stream and write to a file in Amazon S3. Create another Lambda function to read the S3 file andrestore the items to a DynamoDB table in the new account.
Create an AWS Lambda function to scan the items of the DynamoDB table in the current account and write to a file in Amazon S3. Create another Lambda function to read the S3 file and restore the items of a DynamoDB table in the newaccount.

38 / 50
A company is migrating its on-premises database workloads to the AWS Cloud. A
database specialist performing the move has chosen AWS DMS to migrate an
Oracle database with a large table to Amazon RDS. The database specialist notices
that AWS DMS is taking significant time to migrate the data. Which actions would
improve the data migration speed? (Choose three.)
Increase the capacity of the AWS DMS replication server.
Enable an Amazon RDS Multi-AZ configuration.
Establish an AWS Direct Connect connection between the on-premises data center and AWS.
Create multiple AWS DMS tasks to migrate the large table.
Configure the AWS DMS replication instance with Multi-AZ.
Enable full large binary object (LOB) mode to migrate all LOB data for all large tables.

39 / 50
A startup company is building a new application to allow users to visualize their on-premises and
cloud networking components. The company expects billions of components to be stored and
requires responses in milliseconds. The application should be able to identify: The networks and
routes affected if a particular component fails. The networks that have redundant routes between
them. The networks that do not have redundant routes between them. The fastest path between
two networks. Which database engine meets these requirements?
Amazon Neptune
Amazon DynamoDB.
Amazon Aurora MySQL
Amazon ElastiCache for Redis

40 / 50
A database specialist was alerted that a production Amazon RDS MariaDB instance with 100 GB of
storage was out of space. In response, the database specialist modified the DB instance and added
50 GB of storage capacity. Three hours later, a new alert is generated due to a lack of free space on
the same DB instance. The database specialist decides to modify the instance immediately to
increase its storage capacity by 20 GB. What will happen when the modification is submitted?
The request will fail because this storage capacity is too large.
The request will succeed only if CPU utilization is less than 10%
The request will succeed only if the primary instance is in active status.
The request will fail as the most recent modification was too soon.

41 / 50
A company recently acquired a new business. A database specialist must migrate an unencrypted
12 TB Amazon RDS for MySQL DB instance to a new AWS account. The database specialist needs to
minimize the amount of time required to migrate the database. Which solution meets these
requirements?
Create a read replica of the DB instance. Give the destination account access to the read replica. In the destination account, create a snapshot of the shared read replica and provision a new RDS for MySQL DB instance.
Create a snapshot of the source DB instance in the source account. Share the snapshot with the destination account. In the target account, create a DB instance from the snapshot.
Use AWS Resource Access Manager to share the source DB instance with the destination account. Create a DB instance in the destination account using the shared resource.
Use mysqldump to back up the source database. Create an RDS for MySQL DB instance in the destination account. Use the mysql command to restore the backup in the destination database.

42 / 50
A company has an AWS CloudFormation template written in JSON that is used to launch new
Amazon RDS for MySQL DB instances. The security team has asked a database specialist to ensure
that the master password is automatically rotated every 30 days for all new DB instances that are
launched using the template. What is the MOST operationally efficient solution to meet these
requirements?
Create an AWS Lambda function to rotate the secret. Modify the CloudFormation template to add an AWS::SecretsManager::RotationSchedule resource.
Save the password in an Amazon S3 object. Encrypt the S3 object with an AWS KMS key. Set the KMS key to be rotated every 30 days by setting the EnableKeyRotation property to true. Use a CloudFormation custom resource to readthe S3 object to extract the password.

43 / 50
A database specialist is managing an application in the us-west-1 Region and wants to set up
disaster recovery in the us-east-1 Region. The Amazon Aurora MySQL DB cluster needs an RPO of 1
minute and an RTO of 2 minutes. Which approach meets these requirements with no negative
performance impact?
Copy Aurora incremental snapshots to the us-east-1 Region.
Create an Aurora Global Database.
Enable synchronous replication.
Enable asynchronous binlog replication.

44 / 50
A company is building a software as a service application. As part of the new user sign-on workflow,
a Python script invokes the CreateTable operation using the Amazon DynamoDB API. After the call
returns, the script attempts to call PutItem. Occasionally, the PutItem request fails with a
ResourceNotFoundException error, which causes the workflow to fail. The development team has
confirmed that the same table name is used in the two API calls. How should a database specialist
fix this issue?
Add a ConditionExpression parameter in the PutItem request.
Change the application to call DescribeTable periodically until the TableStatus is ACTIVE, then call PutItem
Add an allow statement for the dynamodb:PutItem action in a policy attached to the role used by the application creating the table
Set the StreamEnabled property of the StreamSpecification parameter to true, then call PutItem.

45 / 50
A company released a mobile game that quickly grew to 10 million daily active
users in North America. The game's backend is hosted on AWS and makes
extensive use of an Amazon DynamoDB table that is configured with a TTL
attribute. When an item is added or updated, its TTL is set to the current epoch
time plus 600 seconds. The game logic relies on old data being purged so that it
can calculate rewards points accurately. Occasionally, items are read from the
table that are several hours past their TTL expiry. How should a database specialist
fix this issue?
Include a query filter expression to ignore items with an expired TTL.
Create a local secondary index on the TTL attribute.
Set the ConsistentRead parameter to true when querying the table.
Use a client library that supports the TTL functionality for DynamoDB.

46 / 50
A company has a production environment running on Amazon RDS for SQL Server
with an in-house web application as the front end. During the last application
maintenance window, new functionality was added to the web application to
enhance the reporting capabilities for management. Since the update, the
application is slow to respond to some reporting queries. How should the
company identify the source of the problem?
Install and configure Amazon CloudWatch Application Insights for Microsoft .NET and Microsoft SQL Server. Use a CloudWatch dashboard to identify the root cause.
Create a support request and work with AWS Support to identify the source of the issue.
Use AWS X-Ray deployed with Amazon RDS to track query system traces.
Enable RDS Performance Insights and determine which query is creating the problem. Request changes to the query to address the problem.

47 / 50
A company has two separate AWS accounts: one for the business unit and another for corporate
analytics. The company wants to replicate the business unit data stored in Amazon RDS for MySQL
in us-east-1 to its corporate analytics Amazon Redshift environment in us-west-1. The company
wants to use AWS DMS with Amazon RDS as the source endpoint and Amazon Redshift as the
target endpoint. Which action will allow AVS DMS to perform the replication?
Configure the AWS DMS replication instance in its own account and in the same Region as Amazon Redshift.
Configure the AWS DMS replication instance in the same account and Region as Amazon Redshift
Configure the AWS DMS replication instance in the same account and Region as Amazon RDS.
Configure the AWS DMS replication instance in the same account as Amazon Redshift and in the same Region as Amazon RDS.

48 / 50
A company has applications running on Amazon EC2 instances in a private subnet with no internet
connectivity. The company deployed a new application that uses Amazon DynamoDB, but the
application cannot connect to the DynamoDB tables. A developer already checked that all
permissions are set correctly. What should a database specialist do to resolve this issue while
minimizing access to external resources?
Add a route to an internet gateway in the subnet’s route table.
Create a VPC endpoint for DynamoDB and add a route to the endpoint in the subnet’s route table.
Add a route to a NAT gateway in the subnet’s route table.
Assign a new security group to the EC2 instances with an outbound rule to ports 80 and 443.

49 / 50
A company hosts an internal file-sharing application running on Amazon EC2 instances in VPC_A.
This application is backed by an Amazon ElastiCache cluster, which is in VPC_B and peered with
VPC_A. The company migrates its application instances from VPC_A to VPC_B. Logs indicate that
the file-sharing application no longer can connect to the ElastiCache cluster. What should a
database specialist do to resolve this issue?
Modify the ElastiCache security group by adding outbound rules that allow traffic to VPC_B’s CIDR blocks from the ElastiCache cluster
Delete the ElastiCache security group. Add an interface VPC endpoint to enable the EC2 instances to connect to the ElastiCache cluster.
Create a second security group on the EC2 instances. Add an outbound rule to allow traffic from the ElastiCache cluster security group.
Modify the ElastiCache security group by adding an inbound rule that allows traffic from the EC2 instances’ security group to the ElastiCache cluster.

50 / 50
A company is running an on-premises application comprised of a web tier, an application tier, and
a MySQL database tier. The database is used primarily during business hours with random activity
peaks throughout the day. A database specialist needs to improve the availability and reduce the
cost of the MySQL database tier as part of the company’s migration to AWS. Which MySQL
database option would meet these requirements?
Amazon Aurora MySQL cluster.
Amazon RDS for MySQL with Multi-AZ
Amazon Aurora Serverless MySQL cluster.
Amazon RDS for MySQL with read replica.

Your score is
LinkedIn Facebook VKontakte
0%

50 AWS Certified DBS-C01 Past Questions with Answers

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

Leave a Comment Cancel Reply