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NEW QUESTION 25
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.)
- A. Amazon Neptune
- B. Amazon Elasticsearch Service
- C. Amazon DynamoDB
- D. Amazon ElastiCache
- E. Amazon Redshift
Answer: C,D
Explanation:
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/
NEW QUESTION 26
A company is deploying a solution in Amazon Aurora by migrating from an on-premises 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?
- A. Modify the Data Analysts' local client firewall to allow network traffic to AWS.
- B. Restart the DB cluster to apply the SSL change.
- C. Add explicit mappings between the Data Analysts' IP addresses and the instance in the security group assigned to the DB cluster.
- D. Instruct the Data Analysts to download the root certificate and use the SSL certificate on the connection string to connect.
Answer: D
Explanation:
Explanation
* To connect using SSL:
* Provide the SSLTrust certificate (can be downloaded from AWS)
* Provide SSL options when connecting to database
* Not using SSL on a DB that enforces SSL would result in error
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/ssl-certificate-rotation-aurora-postgresql.htm
NEW QUESTION 27
A database specialist manages a critical Amazon RDS for MySQL DB instance for a company. The data stored daily could vary from .01% to 10% of the current database size. The database specialist needs to ensure that the DB instance storage grows as needed.
What is the MOST operationally efficient and cost-effective solution?
- A. Configure RDS Storage Auto Scaling.
- B. Modify the DB instance allocated storage to meet the forecasted requirements.
- C. Configure RDS instance Auto Scaling.
- D. Monitor the Amazon CloudWatch FreeStorageSpace metric daily and add storage as required.
Answer: A
Explanation:
If your workload is unpredictable, you can enable storage autoscaling for an Amazon RDS DB instance. With storage autoscaling enabled, when Amazon RDS detects that you are running out of free database space it automatically scales up your storage. https://aws.amazon.com/about-aws/whats-new/2019/06/rds-storage-auto-scaling/
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PIOPS.StorageTypes.html#USER_PIOPS.Autoscaling
NEW QUESTION 28
A business that specializes in internet advertising is developing an application that will show adverts to its customers. The program stores data in an Amazon DynamoDB database. Additionally, the application caches its reads using a DynamoDB Accelerator (DAX) cluster. The majority of reads come via the GetItem and BatchGetItem queries. The application does not need consistency of readings.
The application cache does not behave as intended after deployment. Specific extremely consistent queries to the DAX cluster are responding in several milliseconds rather than microseconds.
How can the business optimize cache behavior in order to boost application performance?
- A. Increase the size of the DAX cluster.
- B. Create a new DAX cluster with a higher TTL for the item cache.
- C. Configure DAX to be an item cache with no query cache
- D. Use eventually consistent reads instead of strongly consistent reads.
Answer: D
NEW QUESTION 29
A significant automotive manufacturer is switching a mission-critical finance application's database to Amazon DynamoDB. According to the company's risk and compliance policy, any update to the database must be documented as a log entry for auditing purposes. Each minute, the system anticipates about 500,000 log entries. Log entries should be kept in Apache Parquet files in batches of at least 100,000 records per file.
How could a database professional approach these needs while using DynamoDB?
- A. 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.
- B. 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.
- C. 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. - D. 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.
Answer: A
NEW QUESTION 30
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