Amazon DBS-C01 Exam Questions Instant Access

Question 1

A company is writing a new survey application to be used with a weekly televised game show. The application will be available for 2 hours each week. The company expects to receive over 500,000 entries every week, with each survey asking 2-3 multiple choice questions of each user. A Database Specialist needs to select a platform that is highly scalable for a large number of concurrent writes to handle he anticipated volume.

Which AWS services should the Database Specialist consider? (Choose two.)

AAmazon DynamoDB

BAmazon Redshift

CAmazon Neptune

DAmazon Elasticsearch Service

EAmazon ElastiCache

Answer : A, E

https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/Strategies.html#Strategies.WriteThrough

https://aws.amazon.com/products/databases/real-time-apps-elasticache-for-redis/

Question 2

A company is about to launch a new product, and test databases must be re-created from production dat

a. 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?

ARestore a snapshot from the production cluster into test clusters

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

CUse database cloning to create clones of the production cluster

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

Answer : C

https://aws.amazon.com/getting-started/hands-on/aurora-cloning-backtracking/

'Cloning an Aurora cluster is extremely useful if you want to assess the impact of changes to your database, or if you need to perform workload-intensive operations---such as exporting data or running analytical queries, or simply if you want to use a copy of your production database in a development or testing environment. You can make multiple clones of your Aurora DB cluster. You can even create additional clones from other clones, with the constraint that the clone databases must be created in the same region as the source databases.

Question 3

An ecommerce company is running AWS Database Migration Service (AWS DMS) to replicate an on-premises Microsoft SQL Server database to Amazon RDS for SQL Server. The company has set up an AWS Direct Connect connection from its on-premises data center to AWS. During the migration, the company's security team receives an alarm that is related to the migration. The security team mandates that the DMS replication instance must not be accessible from public IP addresses.

What should a database specialist do to meet this requirement?

ASet up a VPN connection to encrypt the traffic over the Direct Connect connection.

BModify the DMS replication instance by disabling the publicly accessible option.

CDelete the DMS replication instance. Recreate the DMS replication instance with the publicly accessible option disabled.

DCreate a new replication VPC subnet group with private subnets. Modify the DMS replication instance by selecting the newly created VPC subnet group.

Answer : C

https://aws.amazon.com/premiumsupport/knowledge-center/dms-disable-public-access/

Question 4

A company is closing one of its remote data centers. This site runs a 100 TB on-premises 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 on- premises 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?

ASet 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.

BLeverage 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 on-premises to Amazon S3 with AWS KMS encryption. Use AWS DMS to finish copying data to Amazon Redshift.

CLeverage 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.

DSet 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 multi-port upload command to upload these files to Amazon S3 with AWS KMS encryption. Once complete, load the data to Amazon Redshift using AWS Glue.

Answer : B

https://aws.amazon.com/blogs/database/new-aws-dms-and-aws-snowball-integration-enables-mass-database-migrations-and-migrations-of-large-databases/

Question 5

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?

AAmazon DynamoDB with on-demand capacity mode

BAmazon Aurora with one writer node and an Aurora Replica with the parallel query feature enabled

CAmazon DynamoDB with provisioned capacity mode with 5,000 write capacity units (WCUs) and 10,000 read capacity units (RCUs)

DAmazon Aurora with one writer node and two cross-Region Aurora Replicas

Answer : A

The number of orders and exact schedule for the sale will vary each day. During the sale, approximately 10,000 concurrent users will look at the deals before buying items. Outside of the sale, the traffic volume is very low ==> Setting provisioning DynamoDB fix read 5000/write 10000 with will waste the resource when the traffic is low. It is not cost-effective.

Question 6

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?

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

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

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

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

Answer : C

Question 7

A startup company in the travel industry wants to create an application that includes a personal travel assistant to display information for nearby airports based on user location. The application will use Amazon DynamoDB and must be able to access and display attributes such as airline names, arrival times, and flight numbers. However, the application must not be able to access or display pilot names or passenger counts.

Which solution will meet these requirements MOST cost-effectively?

AUse a proxy tier between the application and DynamoDB to regulate access to specific tables, items, and attributes.

BUse IAM policies with a combination of IAM conditions and actions to implement fine-grained access control.

CUse DynamoDB resource policies to regulate access to specific tables, items, and attributes.

DConfigure an AWS Lambda function to extract only allowed attributes from tables based on user profiles.

Answer : B

https://aws.amazon.com/blogs/aws/fine-grained-access-control-for-amazon-dynamodb/

Amazon AWS Certified Database - Specialty DBS-C01 Exam Questions