There was a way to prevent a database from being re-opened, by creating a column constraint that references a table with a higher id.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5707 e6896862-9d19-0410-bfb3-e9fa5d50e656
Large result sets now always create temporary tables instead of temporary files.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5708 e6896862-9d19-0410-bfb3-e9fa5d50e656
Documentation

git-svn-id: http://h2database.googlecode.com/svn/trunk@5709 e6896862-9d19-0410-bfb3-e9fa5d50e656