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PolyBase で外部データソースとしてRedshift を連携利用

CData ODBC Driver for Redshift とSQL Server 2019 のPolyBase を使って、リアルタイムRedshift data に外部データソースとしてアクセス。

SQL Server のPolyBase は、データベーステーブルをクエリするTransact-SQL シンタックスを使って、外部データにクエリする仕組みです。 CData ODBC Drivers for Redshift data を組み合わせて使うことで、SQL Server データと同じようにRedshift data へのアクセスが可能です。 本記事では、PolyBase 外部データソースへのRedshift data の設定から、T-SQL クエリを使ったRedshift data へのアクセスを行います。

The CData ODBC drivers offer unmatched performance for interacting with live Redshift data using PolyBase due to optimized data processing built into the driver. When you issue complex SQL queries from SQL Server to Redshift, the driver pushes down supported SQL operations, like filters and aggregations, directly to Redshift and utilizes the embedded SQL engine to process unsupported operations (often SQL functions and JOIN operations) client-side. And with PolyBase, you can also join SQL Server data with Redshift data, using a single query to pull data from distributed sources.

Redshift への接続

If you have not already, first specify connection properties in an ODBC DSN (data source name). This is the last step of the driver installation. You can use the Microsoft ODBC Data Source Administrator to create and configure ODBC DSNs. To create an external data source in SQL Server using PolyBase, configure a System DSN (CData Redshift Sys is created automatically).

Redshift への接続には次を設定します:

  • Server: 接続するデータベースをホストしているクラスタのホスト名およびIP アドレス。
  • Port: クラスタのポート。
  • Database: データベース名、ブランクの場合ユーザーのデフォルトデータベースになります。
  • User: ユーザー名。
  • Password: ユーザーのパスワード。

Server およびPort の値はAWS の管理コンソールで取得可能です:

  1. Amazon Redshift console (http://console.aws.amazon.com/redshift) を開く。
  2. Clusters ページで、クラスタ名をクリック。
  3. クラスタのConfiguration タブで、表示された接続文字列からクラスタのURL をコピーします。

    Click "Test Connection" to ensure that the DSN is connected to Redshift properly. Navigate to the Tables tab to review the table definitions for Redshift.

    Redshift Data の外部データソースの作成

    After configuring the connection, you need to create a master encryption key and a credential database for the external data source.

    Creating a Master Encryption Key

    Execute the following SQL command to create a new master key, 'ENCRYPTION,' to encrypt the credentials for the external data source.

    CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'password';
    

    Creating a Credential Database

    Execute the following SQL command to create credentials for the external data source connected to Redshift data.

    NOTE: IDENTITY and SECRET correspond with the User and Password properties for Redshift.

    CREATE DATABASE SCOPED CREDENTIAL redshift_creds
    WITH IDENTITY = 'username', SECRET = 'password';
    

    Create an External Data Source for Redshift

    Execute the following SQL command to create an external data source for Redshift with PolyBase, using the DSN and credentials configured earlier.

    NOTE: SERVERNAME and PORT corresponds to the Server and Port connection properties for Redshift. PUSHDOWN is set to ON by default, meaning the ODBC Driver can leverage server-side processing for complex queries.

    CREATE EXTERNAL DATA SOURCE cdata_redshift_source
    WITH ( 
      LOCATION = 'odbc://SERVERNAME[:PORT]',
      CONNECTION_OPTIONS = 'DSN=CData Redshift Sys',
      -- PUSHDOWN = ON | OFF,
      CREDENTIAL = redshift_creds
    );
    

    Redshift のExternal Table を作成

    After creating the external data source, use CREATE EXTERNAL TABLE statements to link to Redshift data from your SQL Server instance. The table column definitions must match those exposed by the CData ODBC Driver for Redshift. You can refer to the Tables tab of the DSN Configuration Wizard to see the table definition.

    Sample CREATE TABLE Statement

    The statement to create an external table based on a Redshift Orders would look similar to the following:

    CREATE EXTERNAL TABLE Orders(
      ShipName [nvarchar](255) NULL,
      ShipCity [nvarchar](255) NULL,
      ...
    ) WITH ( 
      LOCATION='Orders',
      DATA_SOURCE=cdata_redshift_source
    );
    

    Having created external tables for Redshift in your SQL Server instance, you are now able to query local and remote data simultaneously. Thanks to built-in query processing in the CData ODBC Driver, you know that as much query processing as possible is being pushed to Redshift, freeing up local resources and computing power. Download a free, 30-day trial of the ODBC Driver for Redshift and start working with live Redshift data alongside your SQL Server data today.

 
 
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