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===Linking Tables from Oracle into Virtuoso===

1. Start the Virtuoso Web User Interface.
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2. Select the **Conductor** link in the Left Frame and Login as the **dba** user.
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3. Select the **Databases** -> **External Data Source** -> **Data Sources** tab menu items.
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4. Select the **Connect** button for the **ora10ma** Oracle DSN.
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5. On succesful connection, select the **Link Objects** button to obtain a list of available tables.
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6. Select all the tables that are part of the **HR** catalog.
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7. Change the Catalog for each table to **HR** using the **Set All** button.
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8. Ensure a primary key is assigned to all tables that are to be used in the EDM generation phase.
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9. Select the **Link** button to link the selected tables into Virtuoso.
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10. On completion of the Link process, the tables will be displayed in the **External Linked Objects** tab.
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11. The linked tables can be queried by clicking on the hyperlink in the **Local Name** column of the **External Linked Objects** tab above. This loads the Virtuoso **Interactive SQL** interface with the required SQL **Select** for retrieving the remote table data . We shall use the **HR.ora10ma.COUNTRIES** table to demonstrate this.
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12. Click the **Execute** button to run the query and retrieve the results from the remote table.
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13. The tables can also be viewed as part of the Virtuoso **SQL Schema Objects** under the **HR** catalog name.
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The Link process is now complete enabling the tables to be queried as if part of the Virtuoso Schema.