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Migrating Oracle Data into SQL Server (OracleToSQL)

After you have successfully synchronized the converted objects with SQL Server, you can migrate data from Oracle to SQL Server.

Important noteImportant

If the engine being used is Server Side Data Migration Engine, then, before you can migrate data, you must install the SSMA for Oracle Extension Pack and the Oracle providers on the computer that is running SSMA. The SQL Server Agent service must also be running. For more information about how to install the extension pack, see Installing Server Components (OracleToSQL)

Before migrating data to SQL Server, review the project migration options in the Project Settings dialog box.

  • By using this dialog box you can set options such as migration batch size, table locking, constraint checking, null value handling, and identity value handling. For more information about the Project Migration Settings, see Project Settings (Migration) (OracleToSQL).

  • The Migration Engine in the Project Settings dialog box, allows the user to perform the migration process using two types of data migration engines:

    1. Client Side Data Migration Engine

    2. Server Side Data Migration Engine


Client Side Data Migration:

  • To initiate data-migration on the client side, select the Client Side Data Migration Engine option in the Project Settings dialog box.

  • In Project Settings, the Client Side Data Migration Engine option is set.

    NoteNote

    The Client-Side Data Migration Engine resides inside the SSMA application and is, therefore, not dependent on the availability of the extension pack.

Server Side Data Migration:

  • During the Server side data migration, the engine resides on the target database. It is installed through the extension pack. For more information on how to install the extension pack, see Installing Server Components on SQL Server

  • To initiate migration on the server side, select the Server Side Data Migration Engine option in the Project Settings dialog box.


Migrating data is a bulk-load operation that moves rows of data from Oracle tables into SQL Server tables in transactions. The number of rows loaded into SQL Server in each transaction is configured in the project settings.

To view migration messages, make sure that the Output pane is visible. Otherwise, from the View menu, select Output.


To migrate data

  1. Verify the following:

    • The Oracle providers are installed on the computer that is running SSMA.

    • You have synchronized the converted objects with the SQL Server database.

  2. In Oracle Metadata Explorer, select the objects that contain the data that you want to migrate:

    • To migrate data for all schemas, select the check box next to Schemas.

    • To migrate data or omit individual tables, first expand the schema, expand Tables, and then select or clear the check box next to the table.

  3. To migrate data, two cases arise:


    Client Side Data Migration:

    • For performing Client Side Data Migration, select the Client Side Data Migration Engine option in the Project Settings dialog box.


    Server Side Data Migration:

    • Before performing data migration on the server side, ensure:

      1. The SSMA for Oracle Extension Pack is installed on the instance of SQL Server.

      2. The SQL Server Agent service is running on the instance of SQL Server.

    • For performing Server Side Data Migration, select the Server Side Data Migration Engine option in the Project Settings dialog box.

  4. Right-click Schemas in Oracle Metadata Explorer, and then click Migrate Data. You can also migrate data for individual objects or categories of objects: Right-click the object or its parent folder; select the Migrate Data option.

    NoteNote

    If the SSMA for Oracle Extension Pack is not installed on the instance of SQL Server, and if Server Side Data Migration Engine is selected, then while migrating the data to the target database, the following error is encountered: ‘SSMA Data Migration components were not found on SQL Server, server-side data migration will not be possible. Please check if Extension Pack is installed correctly’. Click Cancel to terminate the data migration.

  5. In the Connect to Oracle dialog box, enter the connection credentials, and then click Connect. For more information on connecting to Oracle, see Connect To Oracle (OracleToSQL)


    For connecting to the target database SQL Server, enter the connection credentials in the Connect to SQL Server dialog box, and click Connect. For more information on connecting to SQL Server, see Connect to SQL Server


    Messages will appear in the Output pane. When the migration is complete, the Data Migration Report appears. If any data did not migrate, click the row that contains the errors, and then click Details. When you are finished with the report, click Close. For more information on Data Migration Report, see Data Migration Report

NoteNote

When SQL Express edition is used as the target database, only client side data migration is allowed and server side data migration is not supported.

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