Q: Which Notes SQL should I adopt? 64bit or 32bit?
A: It depends on your ODBC application. You must make your ODBC application, Notes SQL driver and Notes/Domino with same bitnum.
For example, if your ODBC application is 64bit, you need adopt Lotus Notes SQL driver 64bit. And to support 64bit Notes SQL, you have to adopt Domino 64bit.
Another example, if your ODBC application is 32bit, you need adopt Lotus Notes SQL driver 32bit. And Notes 32bit and Domino 32bit support 32bit Notes SQL.