16
Problems without a DBMS...
•System crashes:
–What is the problem ?
•Large data sets (say 50GB)
–What is the problem ?
•Simultaneous access by many users
–Need locks: we
know them from OS, but now data on disk; and is there any fun to re-implement them ?
Read
‘students.txt’
Read ‘courses.txt’
Find&update the
record “Mary Johnson”
Find&update the
record “CSE444”
Write
“students.txt”
Write “courses.txt”
CRASH
!