There was a PA woman (IIRC employed in PA as a prison guard) who was initially jailed in NJ after a traffic stop as a result of a data base search revealing she had a CCW.I think you have two stories mixed up:
http://www.philly.com/philly/news/new_jersey/20150403_Christie_pardons_Phila__mom_snagged_by_N_J__gun_law.htmlhttps://www.pennlive.com/news/2016/02/pa_corrections_officer_with_ca.htmlAgain, there is no such national database. However, I do believe as a courtesy if an officer from one state requests it a search will be done.