<transcript><audio_193>some changes we'll have to undo all of those changes there can also be system failures such as surprise surprise software sometimes have bugs operating systems sometimes has bugs right so your system could</transcript><transcript><audio_194>crash for a software failure and part of the work may have been done transaction has not committed or it has committed the changes were in buffer pool and we still need to make sure the right thing happens there could be Hardware failures like in the early days of data centers</transcript><transcript><audio_195>there is to be a failure that uh the metag guys then called Facebook had written papers about saying the D Rams that were put on the servers because all of them were so close by and they hadn't really figured it out as to what happens at that scale not just them but everyone the dam chips would come off and one of</transcript><transcript><audio_196>the common failures was after a little while even though everything was fine the dam chips would just come off their slots now they glue it most of the time don't want that to happen uh so Hardware could fail for a variety of reasons it could be something like that or it could be the part actually failed uh the</transcript><transcript><audio_197>system crashes all kinds of things that happen one thing they're going to assume today is that the nonvolatile storage the SSD or the disk does come back and has the contents because we don't have this ideal storage with the replication stuff so just reiterating that</transcript> some changes we'll have to undo all of those changes there can also be system failures such as surprise surprise software sometimes have bugs operating systems sometimes has bugs right so your system could crash for a software failure and part of the work may have been done transaction has not committed or it has committed the changes were in buffer pool and we still need to make sure the right thing happens there could be Hardware failures like in the early days of data centers there is to be a failure that uh the metag guys then called Facebook had written papers about saying the D Rams that were put on the servers because all of them were so close by and they hadn't really figured it out as to what happens at that scale not just them but everyone the dam chips would come off and one of the common failures was after a little while even though everything was fine the dam chips would just come off their slots now they glue it most of the time don't want that to happen uh so Hardware could fail for a variety of reasons it could be something like that or it could be the part actually failed uh the system crashes all kinds of things that happen one thing they're going to assume today is that the nonvolatile storage the SSD or the disk does come back and has the contents because we don't have this ideal storage with the replication stuff so just reiterating that
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