AWS Certified Data Analytics Specialty 2021 – Hands-On - DynamoDB Basic APIs

The video tutorial provides a comprehensive overview of DynamoDB operations, including writing, reading, deleting, and batch processing. It explains the differences between put and update operations, the use of conditional writes, and the methods for reading data using get item, query, and scan. The tutorial also covers deleting data with delete item and delete table, and discusses batch operations for efficiency. Key concepts such as projection expressions, filter expressions, and pagination are also introduced.

What is the main difference between 'put item' and 'update item' operations in DynamoDB?

• Put item creates or replaces an item, while update item modifies existing attributes.

• Put item modifies existing attributes, while update item creates or replaces an item.

• Both operations are used to read items.

• Both operations are used to delete items.

Which read consistency mode in DynamoDB might result in higher latency?

• Parallel read

• Strongly consistent read

• Eventually consistent read

• Batch read

What is a key limitation of using the 'scan' operation in DynamoDB?

• It does not support pagination.

• It can only read one item at a time.

• It is inefficient as it reads the entire table.

• It cannot be used with projection expressions.

How can you optimize a scan operation in DynamoDB for faster performance?

• Use a parallel scan with multiple workers.

• Avoid using projection expressions.

• Use a single worker to scan the table.

• Disable pagination.

What is the purpose of the 'delete table' operation in DynamoDB?

• To update all items in a table.

• To delete all items in a table quickly.

• To delete a single item from the table.

• To read all items in a table.

Which operation allows you to write up to 25 items in a single API call in DynamoDB?

• Update item

• Put item

• Batch write item

• Batch get item

What is a key advantage of using batch operations in DynamoDB?

• They reduce the number of API calls and improve efficiency.

• They increase the latency of operations.

• They allow for sequential processing of items.

• They are used to delete tables.