Hot backup
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Thread: Hot backup

  1. #1
    Join Date
    Feb 2002
    Posts
    267
    hi folks
    what is the advantage of specifying 'alter tablespace begin backup'.
    and then taking physical backup
    Even if i don't specify this and take a physical backup of the datafile,
    i will be able to recover the datafile.
    Could anybody guide me the advantages of hot bacup

    regards
    sonia

  2. #2
    Join Date
    Feb 2000
    Location
    Washington DC
    Posts
    1,843
    Originally posted by Sonia
    hi folks
    what is the advantage of specifying 'alter tablespace begin backup'.
    and then taking physical backup
    Even if i don't specify this and take a physical backup of the datafile,
    i will be able to recover the datafile.
    Could anybody guide me the advantages of hot bacup

    regards
    sonia
    http://otn.oracle.com/docs/products/...backup.htm#958
    Reddy,Sam

  3. #3
    Join Date
    Apr 2002
    Location
    Germany.Laudenbach
    Posts
    448
    Hi,
    when you switch a tablespace in HotBackup-Mode Oracle not only writes Block-changes to the log, but even whole modified ORacle-Blocks;
    Why?
    If your Oracle-block would greater than yours OS-Block it coild be happen that your backup-tool reads for example the half Oracle-block, when it tires to rad the next then it ( the Oracle-block ) could be changed. You have backuped an inconsistent Oracle-Block.
    Due to HotBackup-Mode Oracle can complete tht Blocks data totally due to the block-wise logging.

    The best Method to backup is with rman :

    * No HotBackup-Mode
    * Smaller Backup-files
    * Blockconsitsency-check while backing up
    * incremental Backups
    * intelligent support due to repository when you recover the db

    Orca




  4. #4
    Join Date
    Apr 2002
    Posts
    28
    Sonia,
    You may also find it helpful to use the I/O rate throttling feature of RMAN. This way you can limit the I/O rate in case you have to due a backup during times when the server is in use by many users. I use this technique in scripts which backup archivelog files separately from full database backups because this might have to occur during the daytime. Here is a link to an example script:

    http://www.dotcomsolutionsinc.net/pr...ol901_85_.html

    David Simpson
    http://www.dotcomsolutionsinc.net

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