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Thread: Archival process

  1. #1
    Join Date
    Aug 2000
    Chicago IL


    I have just turned archiving on. (a scenario)
    Now I am not an expert at this but I understand this much. I took a backup today morning then turn archiving on and let the users pound on the db. Arch process takes redo logs and writes them to arc. this comming up sunday i want to restore till thursday at a certain time then can i get any suggestions on how to do that?

    I also need to learn about RMAN. Any suggestions on how to setup and use?

  2. #2
    Join Date
    Feb 2000
    Washington DC
    I am just giving hint here and you refer documentation for exact steps. You can use point in time recovery. I mean till a particular time, May be till Midnight THURSDAY, applying your logs till that point of time.

  3. #3
    Join Date
    Nov 2000
    You almost got it.

    Turn archiving on BEFORE you take your backup. This way, you can be sure that you will be able to recover from that point in time. Otherwise, there may be a gap in the SCN numbers between the time you took the backup and the time you turned archiving on (however minute, oracle can't skip a database change).
    Jeff Hunter
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    "I pledge to stop eating sharks fin soup and will not do so under any circumstances."

  4. #4
    Join Date
    Aug 2000
    Chicago IL
    so MARIST are you saying that
    once a week passes with archiving running. I bring down the database which shutsdown the archiving. Take a cold backup and backup the archives?

  5. #5
    Join Date
    Jan 2000
    Silver Spring MD USA
    Whenever you turn archiving on for a database, you must take a backup right afterwards, before any transactions have been done. You cannot use a backup taken while the database was in noarchivelog mode to restore a database that has been put in archivelog mode.

    Consider the following scenario:
    1) database in noarchivelog mode
    2) cold backup
    3) turn archiving on
    4) cold backup
    5) open up to users
    6) hot backup
    7) database crashes

    Database can be restored using archived logs and hot backup from step 6 or cold backup from step 4.
    Backup taken at step 2 cannot restore database to the state it was right before it crashed.
    It will only restore to the state it was at step 2. Archived logs cannot be applied to a cold backup taken when the database was in noarchivelog mode.

    hope this clears it up

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