Today you have to specify a view_rebuild_dir to get optimized view rebuild.
With 64bit it should be perfectly OK to have the complete processing in memory without a temp-file.
When you look into the usage of the view_rebuild_dir (which we move to tmpfs on Linux for better performance) the usage is quite low.
But you have to provide much more "disk" space because Domino uses an estimated size for the space that is too high in some cases. So you need more space to avoid a fallback to the slower view update method.
The new idea is to have the whole processing in memory now that Domino 10 is 64bit only
Daniel Nashed [ https://blog.nashcom.de ]