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PolyBase で外部データソースとしてSQL Server を連携利用

CData ODBC Driver for SQL Server とSQL Server 2019 のPolyBase を使って、リアルタイムSQL Server 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 SQL Server data を組み合わせて使うことで、SQL Server データと同じようにSQL Server 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SQL Server data の設定から、T-SQL クエリを使ったSQL Server data へのアクセスを行います。

The CData ODBC drivers offer unmatched performance for interacting with live SQL Server data using PolyBase due to optimized data processing built into the driver. When you issue complex SQL queries from SQL Server to SQL Server, the driver pushes down supported SQL operations, like filters and aggregations, directly to SQL Server 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 SQL Server data, using a single query to pull data from distributed sources.

SQL Server 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 SQL Server Sys is created automatically).

Microsoft SQL Server への接続

Microsoft SQL Server への接続には以下を入力します:

  • Server: SQL Server が稼働するサーバー名。
  • User: SQL Server に接続するユーザー名。
  • Password: 接続するユーザーのパスワード。
  • Database: SQL Server データベース名。

Azure SQL Server およびAzure Data Warehouse への接続

Azure SQL Server およびAzure Data Warehouse には以下の接続プロパティを入力して接続します:

  • Server: Azure 上のサーバー。Azure ポータルの[SQL databases](もしくは[SQL data warehouses])-> データベースを選択 -> [Overview]-> [Server name]で確認で可能です。
  • User: Azure に認証するユーザー名。
  • Password: 認証するユーザーのパスワード。
  • Database: Azure ポータルでSQL databases (or SQL warehouses) ページに表示されるデータベース名。

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

SQL Server 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 SQL Server data.

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

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

Create an External Data Source for SQL Server

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

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

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

SQL Server のExternal Table を作成

After creating the external data source, use CREATE EXTERNAL TABLE statements to link to SQL Server data from your SQL Server instance. The table column definitions must match those exposed by the CData ODBC Driver for SQL Server. 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 SQL Server Orders would look similar to the following:

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

Having created external tables for SQL Server 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 SQL Server, freeing up local resources and computing power. Download a free, 30-day trial of the ODBC Driver for SQL Server and start working with live SQL Server data alongside your SQL Server data today.

 
 
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