Recovery
The recovery works in three phases. The first phase, Analysis, computes all the necessary information from the logfile. The Redo phase restores the database to the exact state at the crash, including all the changes of uncommited transactions that were running at that point in time. The Undo phase then undoes all uncommited changes, leaving the database in a consistent state.
Read more about this topic: Algorithms For Recovery And Isolation Exploiting Semantics
Famous quotes containing the word recovery:
“With any recovery from morbidity there must go a certain healthy humiliation.”
—Gilbert Keith Chesterton (1874–1936)
“Walking, and leaping, and praising God.”
—Bible: New Testament Acts, 3:8.
Referring to the miraculous recovery of a lame man, through the intervention of Peter.
“It’s even pleasant to be sick when you know that there are people who await your recovery as they might await a holiday.”
—Anton Pavlovich Chekhov (1860–1904)