AWS DynamoDB 面试题与答案
问题 41. How does DynamoDB handle backups?
DynamoDB supports on-demand backups and enables Point-in-Time Recovery (PITR). Backups can be used to restore a table to any point in time within the last 35 days.
问题 42. What is the purpose of the 'BatchGetItem' operation in DynamoDB?
'BatchGetItem' retrieves multiple items from one or more tables using their primary keys. It allows efficient retrieval of multiple items in a single request.
问题 43. Explain the concept of the 'PutItem' operation in DynamoDB.
'PutItem' creates a new item or replaces an existing item with a new one. It adds an item to the table if it does not exist, or replaces the existing item if it does.
问题 44. What is the purpose of the 'DeleteTable' operation in DynamoDB?
'DeleteTable' is used to delete an existing table and all of its data permanently. Once deleted, a table cannot be recovered.
问题 45. Explain the concept of the 'GetItem' operation in DynamoDB.
'GetItem' retrieves a single item from a table based on its primary key. It is used to read a specific item from the table.
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- What is DynamoDB?
- Explain the concept of the 'GetItem' operation in DynamoDB.
- How does DynamoDB handle transactions?