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Map Db2 and SQL Server data types (Db2ToSQL)

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Db2 database types differ from SQL Server database types. When you use SQL Server Migration Assistant (SSMA) to convert Db2 database objects to SQL Server objects, you must specify how to map data types from Db2 to SQL Server. You can accept the default data type mappings, or you can customize the mappings as shown in the following sections.

Default mappings

SSMA has a default set of data type mappings. For the list of default mappings, see Project Settings (Type Mapping).

Type mapping inheritance

You can customize type mappings at the project level, object category level (such as all stored procedures), or object level. Settings are inherited from the higher level unless they're overridden at a lower level. For example, if you map smallmoney to money at the project level, all objects in the project use this mapping unless you customize the mapping at the object or category level.

When you view the Type Mapping tab in SSMA, the background is color-coded to show which type mappings are inherited. The background of a type mapping is yellow for any inherited type mapping, and white for any mapping that is specified at the current level.

Customize data type mappings

The following procedure shows how to map data types at the project, database, or object level:

  1. To customize data type mapping for the whole project, open the Project Settings dialog box:

    1. Navigate to Tools > Project Settings.

    2. In the left pane, select Type Mapping.

      The type mapping chart and buttons appear in the right pane.

    Or, to customize data type mapping at the database, table, view, or stored procedure level, select the database, object category, or object in Db2 Metadata Explorer:

    1. In Db2 Metadata Explorer, select the folder or object to customize.

    2. In the right pane, select the Type Mapping tab.

  2. To add a new mapping, do the following steps:

    1. Select Add.

    2. Under Source type, select the Db2 data type to map.

    3. If the type requires a length, specify the minimum data length for the mapping in the From box and the maximum data length in the To box.

      This lets you customize the data mapping for smaller and larger values of the same data type.

    4. Under Target type, select the target SQL Server data type.

      Some types require a target data type length. If necessary, enter the new data length in the Replace with box.

    5. Select OK.

  3. To modify a data type mapping, do the following steps:

    1. Select Edit.

    2. Under Source type, select the Db2 data type to map.

    3. If the type requires a length, specify the minimum data length for the mapping in the From box and the maximum data length in the To box.

      This lets you customize the data mapping for smaller and larger values of the same data type.

    4. Under Target type, select the target SQL Server data type.

      Some types require a target data type length. If necessary, enter the new data length in the Replace with box, and then select OK.

  4. To remove a custom data type mapping, do the following steps:

    1. Select the row in the type mapping list that contains the data type mapping you want to remove.

    2. Select Remove.

      You can't remove inherited mappings. However, inherited mappings are overridden by custom mappings on a specific object or object category.

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