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now lets talk about another form of login based recovery called redo login here redo logging implements the no force and no steal strategy for bufferable management in redo logging we have the same type of lock records as undo logging the only difference is thats for the update block record where instead of storing the previous value for a particular data element we actually store the new value that it is going to write we will see why that is the case in a second the idea behind redo logging is actually very similar to undo login except that at recovery time instead of undoing all the transactions that are incomplete we actually redo the actions of all transactions that were committed instead meanwhile we leave all the uncommitted transactions alone and dont touch them and like undo logging we also have a single rule to buy too when it comes to redo logging if a transaction modifies a data element x then both the update record and the commit record for that transaction must be writ
