Well, optimization of SQL in general and VB/SQL (ADO.NET) apps in particular is a huge topic. There is quite a bit on MSDN if you search for it, including some information aimed directly at VB/C# ...

To update the data, you can specify view descriptors in the PROC SQL INSERT, DELETE, and UPDATE statements. Here is a summary of these PROC SQL statements: DELETE deletes records from a CA-DATACOM/DB ...