i understand your reasoning. But aren't MySQL and Postgres "servers" that must be installed on my server. All I need to store is a Key=>Pair. I don't need complex database engines. All I was hoping for is one that lock and unlocks but does not cache. Maybe an example. And No I didn't say say I had to use DB_File. I know Unix and Linux have hundreds of files that multiple users read and write from and They don't have this problem nor have to install some server system to do their work for them. I'm thinking there are functions that I can use also.