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the basic idea with logging is that for every update that we make in a transaction we will record info to allow redo and undo in a log weamp;#39;re going to make these log sequential writes on a separate disk device this disk device hopefully is just writing sequentially to the tail to the end of this log all right so it goes very fast and weamp;#39;re going to write very minimalist info into that log so not only is it going to be efficient i/o but itamp;#39;s not going to be very much i/o weamp;#39;re going to be able to pack multiple updates into a single log page even though they represent perhaps updates to lots of database pages what is the log well in essence itamp;#39;s an ordered list of log records written to the disk that allow redo it undo a log record weamp;#39;re gonna look at more carefully in a minute but basically itamp;#39;s going to have a transaction ID at a page ID so this transaction updated this page and then information about how to redo or undo the update