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# 在 Amazon Keyspaces 中查看 CDC 直播
<a name="keyspaces-view-cdc"></a>

要查看或列出密钥空间中的所有流，可以使用 CQL `system_schema_mcs.streams` 中的语句查询系统密钥空间中的表，或者在、或控制台中 AWS CLI使用`get-stream`和`list-stream`命令。

有关所需的权限，请参阅[在 Amazon Keyspaces 中配置使用 CDC 流的权限](configure-cdc-permissions.md)。

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

**使用 CQL 查看 CDC 直播**
+ 要监控表的 CDC 状态，您可以使用以下语句。

  ```
  SELECT custom_properties
  FROM system_schema_mcs.tables 
  WHERE keyspace_name='my_keyspace' and table_name='my_table';
  ```

  该命令的输出类似于此。

  ```
  ...
  custom_properties
  ----------------------------------------------------------------------------------
  {'cdc_specification':{'status': 'Enabled', 'view_type': 'NEW_IMAGE', 'latest_stream_arn': 'arn:aws:cassandra:us-east-1:111122223333:/keyspace/my_keyspace/table/my_table/stream/stream_label''}}
  ...
  ```

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#### [ CLI ]

**使用查看 CDC 直播 AWS CLI**

1. 此示例说明如何查看表的流信息。

   ```
   aws keyspaces get-table \
   --keyspace-name 'my_keyspace' \
   --table-name 'my_table'
   ```

   命令的输出如下所示。

   ```
   {
       "keyspaceName": "my_keyspace",
       "tableName": "my_table",
       ... Other fields ...,
       "latestStreamArn": "arn:aws:cassandra:us-east-1:111122223333:/keyspace/my_keyspace/table/my_table/stream/stream_label",
       "cdcSpecification": {
           "status": "ENABLED",
           "viewType": "NEW_AND_OLD_IMAGES"    
       }
   }
   ```

1. 你可以在指定的列表中列出你账户中的所有直播 AWS 区域。下面是一个命令示例。

   ```
   aws keyspacesstreams list-streams --region us-east-1
   ```

   该命令的输出可能与此类似。

   ```
   {
       "Streams": [
           {
               "StreamArn": "arn:aws:cassandra:us-east-1:111122223333:/keyspace/ks_1/table/t1/stream/2023-05-11T21:21:33.291",
               "StreamLabel": "2023-05-11T21:21:33.291",
               "KeyspaceName": "ks_1"
               "TableName": "t1",
           },
           {
               "StreamArn": "arn:aws:cassandra:us-east-1:111122223333:/keyspace/ks_1/table/t2/stream/2023-05-11T21:21:33.291",
               "StreamLabel": "2023-05-11T21:21:33.291",
               "KeyspaceName": "ks_1"Create a keyspace with the name catalog. Note
                                   that streams are not supported in multi-Region keyspaces.
               "TableName": "t2",
           },
           {
               "StreamArn": "arn:aws:cassandra:us-east-1:111122223333:/keyspace/ks_2/table/t1/stream/2023-05-11T21:21:33.291",
               "StreamLabel": "2023-05-11T21:21:33.291",
               "KeyspaceName": "ks_3"
               "TableName": "t1",
           }
       ]
   }
   ```

1. 您还可以使用以下参数列出给定密钥空间的 CDC 流。

   ```
   aws keyspacesstreams list-streams --keyspace-name ks_1 --region us-east-1
   ```

   该命令的输出类似于此。

   ```
   {
       "Streams": [
           {
               "StreamArn": "arn:aws:cassandra:us-east-1:111122223333:/keyspace/ks_1/table/t1/stream/2023-05-11T21:21:33.291",
               "StreamLabel": "2023-05-11T21:21:33.291",
               "KeyspaceName": "ks_1"
               "TableName": "t1",
           },
           {
               "StreamArn": "arn:aws:cassandra:us-east-1:111122223333:/keyspace/ks_1/table/t2/stream/2023-05-11T21:21:33.291",
               "StreamLabel": "2023-05-11T21:21:33.291",
               "KeyspaceName": "ks_1"
               "TableName": "t2",
           }
       ]
   }
   ```

1. 您还可以使用以下参数列出给定表的 CDC 流。

   ```
   aws keyspacesstreams list-streams --keyspace-name ks_1 --table-name t2 --region us-east-1
   ```

   该命令的输出类似于此。

   ```
   {
       "Streams": [
           {
               "StreamArn": "arn:aws:cassandra:us-east-1:111122223333:/keyspace/ks_1/table/t2/stream/2023-05-11T21:21:33.291",
               "StreamLabel": "2023-05-11T21:21:33.291",
               "KeyspaceName": "ks_1"
               "TableName": "t2",
           }
       ]
   }
   ```

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#### [ Console ]

**在 Amazon Keyspaces 控制台中查看 CDC 直播**

1. [登录并在家中打开 Amazon Keyspaces 控制台。 AWS 管理控制台 https://console.aws.amazon.com/keyspaces/](https://console.aws.amazon.com/keyspaces/home)

1. 在导航窗格中，选择 “**表**”，然后从列表中选择一个表。

1. 选择 “**直播**” 选项卡以查看直播详情。

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