<transcript><audio_198>component the storage media could fail uh where you know you thought you wrote a page to disk but it actually didn't get written the disc driver came back and said yeah it's written but the bits got corrupted on that we've talked about bit rotting and other kinds of things you will need other types of mechanisms</transcript><transcript><audio_199>with the replication to deal with that and again we won't cover that we will assume that something else takes care of that we'll concern ourselves with just this two tier stuff that we talked about okay where the primary storage is in this nonvolatile dram storage and the</transcript><transcript><audio_200>main storage is in this volatile storage now what we need to do as a database system is to make sure committed transactions changes make it to the stable storage and no partial changes are left around even if they made it to durable storage we can unwind ourselves</transcript><transcript><audio_201>from that we need two key mechanisms to do this one is called undo which is whoops I put something into stable storage into</transcript> component the storage media could fail uh where you know you thought you wrote a page to disk but it actually didn't get written the disc driver came back and said yeah it's written but the bits got corrupted on that we've talked about bit rotting and other kinds of things you will need other types of mechanisms with the replication to deal with that and again we won't cover that we will assume that something else takes care of that we'll concern ourselves with just this two tier stuff that we talked about okay where the primary storage is in this nonvolatile dram storage and the main storage is in this volatile storage now what we need to do as a database system is to make sure committed transactions changes make it to the stable storage and no partial changes are left around even if they made it to durable storage we can unwind ourselves from that we need two key mechanisms to do this one is called undo which is whoops I put something into stable storage into
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