This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
I think the *.db file acts as the database in which all records have been stored, thus all your operation including reading,updating and finding records etc. must associate with this file directly or indirectly,depending on whether you use the cache technology.