Edit

Share via

Mapping DB2 Schemas to SQL Server Schemas (DB2ToSQL)

  • Article

In DB2, each database has one or more schemas. By default, SSMA migrates all objects in an DB2 schema to a SQL Server database named for the schema. However, you can customize the mapping between DB2 schemas and SQL Server databases.

DB2 and SQL Server Schemas

An DB2 database contains schemas. An instance of SQL Server contains multiple databases, each of which can have multiple schemas.

The DB2 concept of a schema maps to the SQL Server concept of a database and one of its schemas. For example, DB2 might have a schema named HR. An instance of SQL Server might have a database named HR, and within that database are schemas. One schema is the dbo (or database owner) schema. By default, the DB2 schema HR will be mapped to the SQL Server database and schema HR.dbo. SSMA refers to the SQL Server combination of database and schema as a schema.

You can modify the mapping between DB2 and SQL Server schemas.

Modifying the Target Database and Schema

In SSMA, you can map an DB2 schema to any available SQL Server schema.

To modify the database and schema

  1. In DB2 Metadata Explorer, select Schemas.

    The Schema Mapping tab is also available when you select an individual database, the Schemas folder, or individual schemas. The list in the Schema Mapping tab is customized for the selected object.

  2. In the right pane, click the Schema Mapping tab.

    You will see a list of all DB2 schemas, followed by a target value. This target is denoted in a two part notation (database.schema) in SQL Server where your objects and data will be migrated.

  3. Select the row that contains the mapping that you want to change, and then click Modify.

    In the Choose Target Schema dialog box, you may browse for available target database and schema or type the database and schema name in the textbox in a two part notation (database.schema) and then click OK.

  4. The target changes on the Schema Mapping tab.

Modes of Mapping

  • Mapping to SQL Server

You can map source database to any target database. By default source database is mapped to target SQL Server database with which you have connected using SSMA. If the target database being mapped is non-existing on SQL Server, then you will be prompted with a message "The Database and/or schema does not exist in target SQL Server metadata. It would be created during synchronization. Do you wish to continue?" Click Yes. Similarly, you can map schema to non-existing schema under target SQL Server database which will be created during synchronization.

Reverting to the Default Database and Schema

If you customize the mapping between an DB2 schema and a SQL Server schema, you can revert the mapping back to the default values.

To revert to the default database and schema

  1. Under the schema mapping tab, select any row and click Reset to Default to revert to the default database and schema.

Next Steps

If you want to analyze the conversion of DB2 objects into SQL Server objects, you can Data Migration Report (SSMA Common).

See Also

Connecting to SQL Server (DB2ToSQL)
Migrating DB2 Databases to SQL Server (DB2ToSQL)