AWS DynamoDB 面试题与答案
问题 11. What is the Local Secondary Index (LSI) in DynamoDB?
A Local Secondary Index is an index that has the same partition key as the base table but a different sort key. It allows efficient querying of data within a single partition.
问题 12. Explain the concept of Item Collections in DynamoDB.
An Item Collection is a set of items that have the same partition key value in a table with a composite primary key. Collections are formed when a table has a sort key.
问题 13. What is the purpose of the DynamoDB Accelerator (DAX)?
DAX is an in-memory caching service that provides fast read access to frequently accessed data in DynamoDB, reducing the need to read from the DynamoDB table directly.
问题 14. How does DynamoDB handle conflicts in write operations?
DynamoDB uses conditional writes and optimistic concurrency control to handle conflicts in write operations. Conditional writes allow you to specify conditions for write operations to succeed.
问题 15. Explain the concept of Time-to-Live (TTL) in DynamoDB.
TTL is a feature in DynamoDB that allows you to automatically expire items from a table after a specified time. It is useful for managing data that has a limited lifespan.
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