<transcript><audio_292>have the redo and undo information okay all right questions I want to make sure I get this part because this is the foundation for understanding everything today and the rest of the next lecture I I why</transcript><transcript><audio_293>we do we the B record is is just to say this is the mark of it and you'll see when we get to checkpointing it will help us figure out what's the boundary of that otherwise if you have to scan a big log file the log file can have millions of billions of Records you'll say where did</transcript><transcript><audio_294>transaction T1 start you have to scan everything this tells you oh I don't need to go any further if I'm worried about transaction T so you want that all right so what's in this log</transcript><transcript><audio_295>records I'm going to simplify it at a big uh dramatic level there's a whole set of papers on what to put in the log records but they'll all pretty much have this in the different type of log records too besides B commit and the the ones I'm telling you again we're going to ignore that there's a big fat</transcript><transcript><audio_296>textbook that can come that Jim gry wrote uh on all the details you'd ever want to know about transactions and logging borrow it from me if you're interested in that for this course we're going to uh assume logs have this common</transcript> have the redo and undo information okay all right questions I want to make sure I get this part because this is the foundation for understanding everything today and the rest of the next lecture I I why we do we the B record is is just to say this is the mark of it and you'll see when we get to checkpointing it will help us figure out what's the boundary of that otherwise if you have to scan a big log file the log file can have millions of billions of Records you'll say where did transaction T1 start you have to scan everything this tells you oh I don't need to go any further if I'm worried about transaction T so you want that all right so what's in this log records I'm going to simplify it at a big uh dramatic level there's a whole set of papers on what to put in the log records but they'll all pretty much have this in the different type of log records too besides B commit and the the ones I'm telling you again we're going to ignore that there's a big fat textbook that can come that Jim gry wrote uh on all the details you'd ever want to know about transactions and logging borrow it from me if you're interested in that for this course we're going to uh assume logs have this common
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