Briefly answer the following questions:
1. What are the roles of the Analysis, Redo, and Undo phases in ARIES?
2. Consider the execution shown in Figure 18.1.

(a) What is done during Analysis? (Be precise about the points at which Analysis begins and ends and describe the contents of any tables constructed in this phase.)
(b) What is done during Redo? (Be precise about the points at which Redo begins and ends.)
(c) What is done during Undo? (Be precise about the points at which Undo begins and ends.)

Transcribed Image Text:

LSN LOG 10 20 30 40 50 T2 end 60 - 0 Tl abort begin checkpoint end checkpoint update: Tl writes P5 update: T2 writes P3 T2 commit update: T3 writes P3 CRASH, RESTART