#  > Engineering Notes - Handwritten Notes of all Engineering branches >  > Computer Science and Engineering Notes >  >  Recovery Algorithm of ARIES in database management system free notes

## amitsharma957

ARIES recovers from a system crash in three passes.

* Analysis pass*: This pass determines which  transactions to undo, which pages were dirty at the time of the crash,  and the LSN from which the redo passshould start.

* Redo pass:* This pass starts from a position  determined during analysis, and performs a redo, repeating history, to  bring the database to a state it was in
	before the crash.  	* Undo pass:* This pass rolls back all transactions that were incomplete at the time of crash.





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