These constants are used to determine which type of RDO cursor library is chosen by the ODBC Driver Manager.
| Constant | Value | Description |
| rdUseIfNeeded | 0 | The ODBC driver will choose the appropriate style of cursors. Server-side cursors are used if they are available. |
| rdUseOdbc | 1 | The RDO layer will use the ODBC cursor library. This gives better performance for small result sets but degrades quickly for larger result sets. |
| rdUseServer | 2 | Use server-side cursors. For most large operations this will give better performance, but can cause more network traffic. |
| rdUseClientBatch | 3 | Use the client batch cursor library used for batch update operations. |
| rdUseNone | 4 | Do not open a cursor. Create a forward-only, read-only single-row result set. This uses data access fetch techniques similar to those used by VBSQL and ODBC API access methods. |