面试题与答案

DynamoDB is a fully managed NoSQL database service provided by AWS.

DynamoDB uses a key-value model where each item (record) in the database is uniquely identified by a primary key.

DynamoDB Local is a downloadable version of DynamoDB that enables local development and testing. It allows developers to test applications without incurring AWS costs.

The 'DeleteItem' operation removes one or more items from a table based on their primary key. It is used to delete specific items from a table.

The 'CreateTable' operation is used to create a new table in DynamoDB. It involves specifying the table name, primary key attributes, and provisioned throughput settings.

The 'DescribeTable' operation provides metadata about a table, including its schema, provisioned throughput settings, and the status of any secondary indexes.

Capacity Units represent the throughput that a table can handle. Read Capacity Units (RCUs) and Write Capacity Units (WCUs) determine the amount of read and write operations a table can support.

'ListTables' provides a list of all the tables in a given AWS account and region. It does not require the use of the table's primary key.

'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.

'DeleteTable' is used to delete an existing table and all of its data permanently. Once deleted, a table cannot be recovered.

'GetItem' retrieves a single item from a table based on its primary key. It is used to read a specific item from the table.