Amazon DynamoDB
Developer Guide (API Version 2012-08-10)

Python and DAX

To run the Python sample application on your Amazon EC2 instance, follow this procedure:

  1. Install the DAX Python client using the pip utility:

    pip install amazon-dax-client
  2. Download the sample program source code (.zip file):

    wget http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/samples/TryDax.zip

    When the download is complete, extract the source files:

    unzip TryDax.zip
  3. Run the following Python programs:

    python 01-create-table.py python 02-write-data.py

    The first program creates a DynamoDB table named TryDaxTable. The second program writes data to the table.

  4. Run the following Python programs:

    python 03-getitem-test.py python 04-query-test.py python 05-scan-test.py

    Take note of the timing information—the number of milliseconds required for the GetItem, Query, and Scan tests.

  5. In the previous step, you ran the programs against the Amazon DynamoDB endpoint. Now run the programs again, but this time the GetItem, Query, and Scan operations are processed by your DAX cluster.

    To determine the endpoint for your DAX cluster, choose one of the following:

    • Using the DynamoDB console — Choose your DAX cluster. The cluster endpoint is shown on the console; for example:

      mycluster.frfx8h.clustercfg.dax.usw2.amazonaws.com:8111
    • Using the AWS CLI — Type the following command:

      aws dax describe-clusters --query "Clusters[*].ClusterDiscoveryEndpoint"

      The cluster endpoint port and address are shown in the output; for example:

      { "Port": 8111, "Address":"mycluster.frfx8h.clustercfg.dax.usw2.amazonaws.com" }

    Now run the programs again—but this time, specify the cluster endpoint as a command line parameter:

    python 03-getitem-test.py mycluster.frfx8h.clustercfg.dax.usw2.amazonaws.com:8111 python 04-query-test.py mycluster.frfx8h.clustercfg.dax.usw2.amazonaws.com:8111 python 05-scan-test.py mycluster.frfx8h.clustercfg.dax.usw2.amazonaws.com:8111

    Look at the rest of the output, and take note of the timing information. The elapsed times for GetItem, Query, and Scan should be significantly lower with DAX than with DynamoDB.

  6. Run the following Python program to delete TryDaxTable:

    python 06-delete-table.py

For more information about these programs, see the following sections: