If you change the table definitions in the mapping VMD file, you must update the destination data tables in the database that you have specified for this channel. There are two ways to update these data tables:

• Re-export the Destination Data Tables: This will drop the existing data tables and replace them with new ones. Any data in the existing tables is lost, which may lead to undesirable results. (See Exporting Tables for more details on re-exporting the destination data tables.)

• Modify the existing tables to match the table definitions in the VMD file: Any columns that you add to a table definition in the VMD file must be manually added to the corresponding database table. This requires more effort, but is potentially safer.