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DBS-C01 Exam Dumps - AWS Certified Database - Specialty

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Question # 25

A database specialist needs to review and optimize an Amazon DynamoDB table that is experiencing performance issues. A thorough investigation by the database specialist reveals that the partition key is causing hot partitions, so a new partition key is created. The database specialist must effectively apply this new partition key to all existing and new data.

How can this solution be implemented?

Use Amazon EMR to export the data from the current DynamoDB table to Amazon S3. Then use Amazon EMR again to import the data from Amazon S3 into a new DynamoDB table with the new partition key.

Use AWS DMS to copy the data from the current DynamoDB table to Amazon S3. Then import the DynamoDB table to create a new DynamoDB table with the new partition key.

Use the AWS CLI to update the DynamoDB table and modify the partition key.

Use the AWS CLI to back up the DynamoDB table. Then use the restore-table-from-backup command and modify the partition key.

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Question # 26

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 playerâ€™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 game_id as the partition key

Create a global secondary index with user_id as the partition key

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

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

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Question # 27

A gaming company is evaluating Amazon ElastiCache as a solution to manage player leaderboards. Millions of players around the world will complete in annual tournaments. The company wants to implement an architecture that is highly available. The company also wants to ensure that maintenance activities have minimal impact on the availability of the gaming platform.

Which combination of steps should the company take to meet these requirements? (Choose two.)

Deploy an ElastiCache for Redis cluster with read replicas and Multi-AZ enabled.

Deploy an ElastiCache for Memcached global datastore.

Deploy a single-node ElastiCache for Redis cluster with automatic backups enabled. In the event of a failure, create a new cluster and restore data from the most recent backup.

Use the default maintenance window to apply any required system changes and mandatory updates as soon as they are available.

Choose a preferred maintenance window at the time of lowest usage to apply any required changes and mandatory updates.

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Question # 28

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 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 DynamoDB Streams on each table.

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

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Question # 29

A retail company uses Amazon Redshift for its 1 PB data warehouse. Several analytical workloads run on a Redshift cluster. The tables within the cluster have grown rapidly. End users are reporting poor performance of daily reports that run on the transaction fact tables.

A database specialist must change the design of the tables to improve the reporting performance. All the changes must be applied dynamically. The changes must have the least possible impact on users and must optimize the overall table size.

Which solution will meet these requirements?

Use the STL SCAN view to understand how the tables are getting scanned. Identify the columns that are used in filter and group by conditions. Create a temporary table with the identified columns as sort keys and compression as Zstandard (ZSTD) by copying the data from the original table. Drop the original table. Give the temporary table the same name that the original table had.

Run an explain plan to analyze the queries on the tables. Consider recommendations from Amazon Redshift Advisor. Identify the columns that are used in filter and group by conditions. Convert the recommended columns from Redshift Advisor into sort keys with compression encoding set to RAW. Set the rest of the column compression encoding to AZ64.

Run an explain plan to analyze the queries on the tables. Consider recommendations from Amazon Redshift Advisor. Identify the columns that are used in filter and group by conditions. Convert the recommended columns from Redshift Advisor into sort keys with compression encoding set to I_ZO. Set the rest of the column compression encoding to Zstandard (ZSTD).

Run an explain plan to analyze the queries on the tables. Consider recommendations from Amazon Redshift Advisor. Identify the columns that are used in filter and group by conditions. Create a deep copy of the table with the identified columns as sort keys and compression for all columns as Zstandard (ZSTD) by using a bulk insert. Drop the original table. Give the copy table the same name that the original table had.

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Question # 30

A company runs an ecommerce application on premises on Microsoft SQL Server. The company is planning to migrate the application to the AWS Cloud. The application code contains complex T-SQL queries and stored procedures.

The company wants to minimize database server maintenance and operating costs after the migration is completed. The company also wants to minimize the need to rewrite code as part of the migration effort.

Which solution will meet these requirements?

Migrate the database to Amazon Aurora PostgreSQL. Turn on Babelfish.

Migrate the database to Amazon S3. Use Amazon Redshift Spectrum for query processing.

Migrate the database to Amazon RDS for SQL Server. Turn on Kerberos authentication.

Migrate the database to an Amazon EMR cluster that includes multiple primary nodes.

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Answer:

Explanation:

Correct Answer: A

Explanation from Amazon documents:

Amazon Aurora PostgreSQL is a fully managed relational database service that is compatible with PostgreSQL. Aurora PostgreSQL offers up to three times better performance than standard PostgreSQL, as well as high availability, scalability, security, and durability. Aurora PostgreSQL also supports Babelfish, which is a new feature that enables Aurora to understand queries from applications written for Microsoft SQL Server. Babelfish allows you to migrate your SQL Server databases to Aurora PostgreSQL with minimal or no code changes, and run complex T-SQL queries and stored procedures on Aurora PostgreSQL.

Migrating the database to Amazon Aurora PostgreSQL and turning on Babelfish will meet the requirements of minimizing database server maintenance and operating costs, and minimizing the need to rewrite code as part of the migration effort. This solution will allow the company to benefit from the performance, reliability, and cost-efficiency of Aurora PostgreSQL, while preserving the compatibility and functionality of SQL Server. The company will also avoid the hassle and expense of managing and licensing SQL Server on premises or on AWS.

Therefore, option A is the correct solution to meet the requirements. Option B is not suitable because Amazon S3 is an object storage service that is not designed for OLTP workloads. Amazon Redshift Spectrum is a feature that allows you to query data in S3 using Amazon Redshift, but it is not compatible with SQL Server or T-SQL. Option C is not optimal because Amazon RDS for SQL Server is a managed relational database service that supports SQL Server, but it does not offer the same performance, scalability, or cost savings as Aurora PostgreSQL. Kerberos authentication is a security feature that does not affect the migration effort or the operating costs. Option D is not suitable because Amazon EMR is a big data processing service that runs Apache Hadoop and Spark clusters, not relational databases. EMR does not support SQL Server or T-SQL, and it is not optimized for OLTP workloads.

Question # 31

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 copy of manual snapshot of the DB instance. Restore a new DB instance from the encrypted snapshot.

Modify the DB instance and enable encryption.

Restore a DB instance from the most recent automated snapshot and enable encryption.

Create an encrypted read replica of the DB instance. Promote the read replica to a standalone instance.

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Question # 32

A banking company recently launched an Amazon RDS for MySQL DB instance as part of a proof-of-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.)

A copy of the RDS automated snapshot for this DB instance is in progress within the same AWS Region.

A copy of the RDS automated snapshot for this DB instance is in progress in a different AWS Region.

The RDS maintenance window is not configured.

The RDS DB instance is in the STORAGE_FULL state.

RDS event notifications have not been enabled.

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