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now that we understand the different ways of logging letamp;#39;s talk about different recovery protocols the first one undo logging is one of the basic recovery protocols as we will see undo logging does not use right ahead logging that we covered earlier and it uses the force and steel mechanisms in terms of buffer pool management there are four types of lock records in an undo log start commits or abort of a transaction and finally an update record which states that transaction t wants to update data elements x and x previous value was v the idea behind undo logging is as follows we want to use the lock such that when we need to recover we will undo the effects of all the transactions that have not been committed on the other hand for all the transactions that have been committed we want to leave them alone in order to implement this behavior we need to establish a few rules regarding how we do logging and when to flush the dirty lock and data pages specifically there are two rules
