This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
Most instructions have the sentence beginning "You may assume that at any moment, at most one program is accessing the database file...". Given that, the assessor should not try to run 2 applications against the database file.