M.P. Johnson, DBMS, Stern/NYU, Sp2004
Problems without an DBMS...
Q: What is the problem ?
A: George lost his $100
Same problem even if reordered
2.Simultaneous access by many users
George and Dick visit ATMs at same
Lock checking.txt before each use– what is the problem?
Find&update the rec “George.”
Find&update the rec “George”