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So, let us get started so we have been discussing the the various ideas and concepts, the recovery subsystem of the relational database. So, the principle tool that we use log and log is a sequential file where we keep making entries about the transactions that are under progress and we keep certain important information recorded in the log and we use that log to recover from failures. So, in that context, we looked at what are the various log entries and then we started looking at various specific logging methods and we looked at protocol and undo logging. In this lecture, we will focus on other logging methods, particularly what is called redo logging and also undo redo logging we will see that. So, in undo logging as we have seen in the last lecture, it basically cancels the effect of incomplete transactions. So keeps track of the old values of the items or the date the transaction is in progress have change in the log entries and making use of these old entries to cancel the effect
