本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

# 查看 Amazon Keyspaces 表的热吞吐量
<a name="view-warm-throughput"></a>

您可以使用控制台、CQL 或查看您的 Amazon Keyspaces 表的当前热吞吐量值。 AWS CLI

------
#### [ Console ]

**如何使用控制台查看桌子的预热设置。**

1. 登录并打开 Amazon Keyspaces 控制台，网址为。 AWS 管理控制台[https://console.aws.amazon.com/keyspaces/home](https://console.aws.amazon.com/keyspaces/home)

1. 在导航窗格中，选择**表**，然后选择要查看的表。

1. 在表格的 “**容量**” 选项卡上，继续Pre-warming 执行**表格**。

------
#### [ Cassandra Query Language (CQL) ]

**使用 CQL 查看表的热吞吐量设置**
+ 要查看表的热吞吐量设置，可以使用以下 CQL 语句。

  ```
  SELECT custom_properties
  FROM system_schema_mcs.tables 
  WHERE keyspace_name='catalog' and table_name='book_awards';
  
  // Output:
  ...
  custom_properties
  ----------------------------------------------------------------------------------
  {
      'warm_throughput': 
      {
          'read_units_per_second': '40000', 
          'write_units_per_second': '20000', 
          'status': 'AVAILABLE'
      }
  }
  ...
  ```

------
#### [ CLI ]

**使用查看表的热吞吐量设置 AWS CLI**
+ 您可以使用`get-table`命令查看表的热吞吐量设置，如以下示例所示。

  ```
  aws keyspaces get-table \
  --keyspace-name 'catalog' \
  --table-name 'book_awards'
  ```

  以下显示了预配置模式下单区域表的`get-table`命令输出示例。

  ```
  {
      "keyspaceName": "catalog",
      "tableName": "book_awards",
      ... Existing Fields ...,
      "capacitySpecificationSummary": {
          "throughputMode": "PROVISIONED",
          "readCapacityUnits": 20000,
          "writeCapacityUnits": 10000
      },
      "warmThroughputSpecificationSummary": {
          "readUnitsPerSecond": 40000,
          "writeUnitsPerSecond": 20000,
          "status": "AVAILABLE"
      }
  }
  ```

  以下显示了按需模式下单区域表的输出示例。

  ```
  {
      "keyspaceName": "catalog",
      "tableName": "book_awards_ondemand",
      ... Existing Fields ...,
      "capacitySpecification": {
          "throughputMode": "PAY_PER_REQUEST"
      },
      "warmThroughputSpecificationSummary": {
          "readUnitsPerSecond": 40000,
          "writeUnitsPerSecond": 20000,
          "status": "AVAILABLE"
      }
  }
  ```

------
#### [ Java ]

**使用适用于 Java 的 SDK 读取表格的预热设置。**
+ 使用读取表的热吞吐量值。`get-table`以下代码示例就是一个例子。

  ```
  import software.amazon.awssdk.services.keyspaces.KeyspacesClient;
  import software.amazon.awssdk.services.keyspaces.model.*;
  
  public class GetTableWithPreWarmingExample {
      public static void main(String[] args) {
          KeyspacesClient keyspacesClient = KeyspacesClient.builder().build();
  
          // Get table details including PreWarming specification
          GetTableRequest request = GetTableRequest.builder()
              .keyspaceName("catalog")
              .tableName("book_awards")
              .build();
              
          GetTableResponse response = keyspacesClient.getTable(request);
          
          // Access PreWarming details
          if (response.warmThroughputSpecification() != null) {
              WarmThroughputSpecificationSummary warmThroughputSummary = response.warmThroughputSpecification();
              System.out.println("PreWarming Status: " + warmThroughputSummary.status());
              System.out.println("Read Units: " + warmThroughputSummary.readUnitsPerSecond());
              System.out.println("Write Units: " + warmThroughputSummary.writeUnitsPerSecond());
              
              // Check if PreWarming is active
              if (warmThroughputSummary.status().equals("AVAILABLE")) {
                  System.out.println("Table is fully pre-warmed and ready for high throughput");
              } else if (warmThroughputSummary.status().equals("UPDATING")) {
                  System.out.println("Table PreWarming is currently being updated");
              }
          } else {
              System.out.println("Table does not have PreWarming enabled");
          }
      }
  }
  ```

------