Storage Structure Volatile storage: does not survive system crashes examples:main memory,cache memory Nonvolatile storage: survives system crashes examples:disk,tape,flash memory, non-volatile(battery backed up)RAM Stable storage: a mythical form of storage that survives all failures approximated by maintaining multiple copies on distinct nonvolatile media Database System Concepts,5th Edition,Oct 5,2006 17.5 @Silberschatz,Korth and SudarshanDatabase System Concepts, 5 17.5 ©Silberschatz, Korth and Sudarshan th Edition, Oct 5, 2006 Storage Structure Volatile storage: does not survive system crashes examples: main memory, cache memory Nonvolatile storage: survives system crashes examples: disk, tape, flash memory, non-volatile (battery backed up) RAM Stable storage: a mythical form of storage that survives all failures approximated by maintaining multiple copies on distinct nonvolatile media