Question: which one of the following is not a reason for a database system failure?
Answer: What Are The Causes of Database Loss? The database recovery process is not entirely different from data recovery. ... 
Power Failure. Power failures can lead to hardware failure. ... 
Disk Failure. ... 
Human Error. ... 
Software Corruption. ... 
Virus Infection. ... 
Natural Disasters. ... 
Disgruntled Employees.