Hi Carlos,
The Update will be WHERE KeyField1=?Something AND KeyField2=?SomethingElse--so you need two indices that match the two expressions above exactly. (Not the above expressions, but your expressions--you know what I mean.)
>The table to be update has an index based on the keys for the update, both of them character and without any filtering. I think they can be optimized although I haven't checked for it yet.
>
>Thank you.