roles of the Analysis, Redo and Undo phases in ARIES

roles of the Analysis, Redo and Undo phases in ARIES
What are the roles of the Analysis, Redo and Undo phases in ARIES?
How is checkpointing done in ARIES?
Checkpointing can also be done as follows: Quiesce the system so that only checkpointing activity can be in progress, write out copies of all dirty pages, and include the dirty page table and transaction table in the checkpoint record. What are the pros and cons of this approach versus the checkpointing approach of ARIES?

roles of the Analysis, Redo and Undo phases in ARIES