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  1. #1
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    Unanswered: Overwrite verses Append

    Hi guys I have my backups set to Append rather then to Overwrite, just want a little advice on whether that is a bad idea or not??

    thank you

  2. #2
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    depends. need more details. recovery model. type of backup. whats happens with the backups.

    i am glad i do not have to worry dr anymore.
    Last edited by Thrasymachus; 02-12-09 at 14:16.
    “If one brings so much courage to this world the world has to kill them or break them, so of course it kills them. The world breaks every one and afterward many are strong at the broken places. But those that will not break it kills. It kills the very good and the very gentle and the very brave impartially. If you are none of these you can be sure it will kill you too but there will be no special hurry.” Earnest Hemingway, A Farewell To Arms.

  3. #3
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    Full Recovery mode, 3 times a week, diff, full, translogs

  4. #4
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    are you appending all of those?

    do you archive your backups to tape or another disk or something?
    “If one brings so much courage to this world the world has to kill them or break them, so of course it kills them. The world breaks every one and afterward many are strong at the broken places. But those that will not break it kills. It kills the very good and the very gentle and the very brave impartially. If you are none of these you can be sure it will kill you too but there will be no special hurry.” Earnest Hemingway, A Farewell To Arms.

  5. #5
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    Pros: You can recover from any of the backups in the set.

    Cons: When you overwrite the backup file, you lose all of your backups. none can be extracted separately, unless you restore one as a database, and back it up to a new location.

  6. #6
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    yes appending all and yes they get archived to tape

  7. #7
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    Eventually, the file will get so large that it will become a problem. At that point, you will want to begin a new file. You may want to think out that transition, now ;-)

  8. #8
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    Yeah I knew it would get huge eventually, I just wanted to know if appending is a good idea or not??

  9. #9
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    if you archiving to tape, I would not append your full backup because the data from that day as it was that day is already preserved. If you keep appending you backup file is going to get bigger and bigger and you will not be gaining anything from it because you will have n Numbers of that backup in each of the archived to tape copies you have.

    Right now, everytime you archive to tape you are not only backing up the latest backup but all of the backups that have been appended to that device and you are archiving multiple copies of the same data.
    “If one brings so much courage to this world the world has to kill them or break them, so of course it kills them. The world breaks every one and afterward many are strong at the broken places. But those that will not break it kills. It kills the very good and the very gentle and the very brave impartially. If you are none of these you can be sure it will kill you too but there will be no special hurry.” Earnest Hemingway, A Farewell To Arms.

  10. #10
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    ok I think I understand what you are saying. Ok I will make it so that the fulls dont append. thank you very much Thrasy that what I needed to know

  11. #11
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    I typically keep a current and previous backup on disk (tlogs, diffs, fulls) for each. I never liked the idea of appending full backups. I do it via folders, everything get's archived to tape. I just had too many, "We need the previous day's full backup, not last nights", and waiting for IBM to get a file from tape can be painful.

  12. #12
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    overwrite

    dump trans logs

    keep the copies for each day
    Brett
    8-)

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    The physical order of data in a database has no meaning.

  13. #13
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    The thing that really concerns me is when I go to back up a database (I was just testing this one day) I wanted to do Back up the tail of the log, and leave the database in the restoring state option. But when I do that it takes a long time and I'm wondering if thats normal. I mean the database isnt even that big. Any comments?

  14. #14
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    Backing up the tail of the log is only done in dire circumstances. You should never have to take a database offline for a normal backup.

  15. #15
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    Ok thank you, then that answers my question.

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