15.3
华南理工大学 软件学院
Failure Classification
Failure Classification
Transaction failure :
Logical errors: transaction cannot complete due to some internal
error condition
System errors: the database system must terminate an active
transaction due to an error condition (e.g., deadlock)
System crash: a power failure or other hardware or software failure
causes the system to crash.
Fail-stop assumption: non-volatile storage contents are assumed
to not be corrupted by system crash
Database systems have numerous integrity checks to prevent
corruption of disk data
Disk failure: a head crash or similar disk failure destroys all or part of
disk storage
Destruction is assumed to be detectable: disk drives use
checksums to detect failures
