AWSddb DVA-C01 :: DynamoDB exam3

You are responsible for developing a mobile application that allows people to store and search for reviews of their favourite local restaurants. The application stores all ratings and restaurant data in a DynamoDB table. You need to decide which DynamoDB operations you will allow your users to run on the table and you would like to keep the cost of the application as low as possible as well as provide great performance for the users. Which of the following DynamoDB operations uses the least amount of throughput?. Eventually consistent query. Strongly consistent query. Eventually consistent scan. Strongly consistent scan.

For Amazon DynamoDB on-demand mode tables, one read request unit represents one strongly consistent read request, or two eventually consistent read requests, for an item up to how many KB in size?. 5KB. 3KB. 4KB. 1KB.

A DynamoDB table is configured in provisioned throughput mode with 500 RCU and 100 WCU. How much data can be read and written to the table each second?. 2000 KB for strongly consistent read operations, 4000 KB for eventually consistent read operations, 100 KB for write operations. 500 KB for strongly consistent read operations, 1000 KB for eventually consistent read operations, 100 KB for write operations. 2000 KB for strongly consistent read operations, 4000 KB for eventually consistent read operations, 400 KB for write operations. 500 KB for strongly consistent read operations, 1000 KB for eventually consistent read operations, 400 KB for write operations.

What is an RCU. 4KB of read per second. 1KB of read per second.

When can an LSI be created. At table creation time. At any time for global tables.

When can a GSI be created. At any time. Only at table creation time.

Which of the options below are qualities or benefits of an LSI (2). Shared Capacity Settings with the table. Its own Capacity settings. Alternative SK. Alternative SK and PK.

Which of the options below are qualities or benefits of an GSI(2). Its own capacity allocation. Alternative PK and SK. Alternative PK.

What is true about DAX (choose 4). Supports read caching of items and query/scan results. Supports write-through and read caching. Runs from within a VPC. Good for read heavy workloads. Good for write heavy workloads.

What 4 view types are available with DDB Streams (4). KEYS_ONLY. NEW_IMAGE. OLD_IMAGE. NEW_AND_OLD_IMAGES. KEYS_AND-ATTRIBUTES.

A popular mobile app retrieves data from an AWS DynamoDB table that was provisioned with read-capacity units (RCU’s) that are evenly shared across four partitions. One of those partitions is receiving more traffic than the other partitions, causing hot partition issues. What technology will allow you to reduce the read traffic on your AWS DynamoDB table with minimal effort?. DynamoDB DAX. DynamoDB Streams. ElastiCache. More partitions.

You are a DynamoDB developer for an aerospace company that requires you to write 6 objects per second of 4.5KB in size each. What write capacity unit is needed for your project?. 15. 30. 24. 46.

An organization with online transaction processing (OLTP) workloads have successfully moved to DynamoDB after having many issues with traditional database systems. However, a few months into production, DynamoDB tables are consistently recording high latency. As a Developer Associate, which of the following would you suggest to reduce the latency? (Select two). Consider using Global tables if your application is accessed by globally distributed users. Use eventually consistent reads in place of strongly consistent reads whenever possible. Increase the request timeout settings, so the client gets enough time to complete the requests, thereby reducing retries on the system. Reduce connection pooling, which keeps the connections alive even when user requests are not present, thereby, blocking the services. Use DynamoDB Accelerator (DAX) for businesses with heavy write-only workloads.

As a senior architect, you are responsible for the development, support, maintenance, and implementation of all database applications written using NoSQL technology. A new project demands a throughput requirement of 10 strongly consistent reads per second of 6KB in size each. How many read capacity units will you need when configuring your DynamoDB table?. 20. 60. 30. 10.

The technology team at an investment bank uses DynamoDB to facilitate high-frequency trading where multiple trades can try and update an item at the same time. Which of the following actions would make sure that only the last updated value of any item is used in the application?. Use ConsistentRead = true while doing GetItem operation for any item. Use ConsistentRead = true while doing UpdateItem operation for any item. Use ConsistentRead = true while doing PutItem operation for any item. Use ConsistentRead = false while doing PutItem operation for any item.