What is the purpose behind the Three Phase Commit? It improves upon the two phased commit by requiring that l

Explanation:

Ivan Pavlov was a Russian physiologist. In 1890's he researched abut the salivation in dogs in response to food.

He put a small tube into the dogs cheek to measure the saliva when the dogs were fed. It gave birth to the concept of classical conditioning.

While measuring the salivation rates of dogs he found that they produced saliva whenever they smelt or heard food in expectation of feeding.

Classical conditioning is also known as Pavlovian conditioning. It is learning through association. It explains that if two stimuli are linked together to produce new learned response in an animal or person.

He kept the dogs in an experimental chamber and presented them with meat powder. He collected the saliva by surgically implanting tube in their cheek and noticed that the dogs begin salivating after hearing  the clicking noise produced by the device that distributed the meat powder to dogs even before the meat powder was presented.