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Whitespace Question Exchange 2003

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  • Whitespace Question Exchange 2003

    Greetings.

    My question is...will exchange 2003 use all available whitespace before it uses more space from the database?

    Thanks!

  • #2
    Re: Whitespace Question Exchange 2003

    I don't think so - otherwise there would be no need for an offline defrag process which reclaims whitespace. I think the database grows, regardless of data deletion, until an offline defrag is done - and then it reclaims any "gaps" in the database file.


    Tom
    For my own and your protection, I do not provide support by private message under any circumstances. All such messages will be deleted and ignored.

    Anything you say will be misquoted and used against you

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    • #3
      Re: Whitespace Question Exchange 2003

      Sorry to say, the above answer is incorrect.

      Exchange will use all of the white space in the database first.

      An offline defrag is not required to reclaim the space and offline defrags should not be considered something that needs to be done regularly. I would actually go as far as to say that most Exchange servers NEVER need an offline defrag.

      However due to the way that the Exchange databases work, it is still possible for the amount of white space to increase.

      Exchange stores the data in two formats - messages that are sent internally and messages from outside.

      Therefore if you remove a lot of internal content but then receive a lot of external content, then the white space that was created by deleting the internal will not be used by that new external content.
      It can also work the other way round, and with most Exchange servers they will often have more white space in the file that stores external content.

      Unfortunately Exchange does not report the amount of white space in the individual databases - just in the store as a whole - so there is no way of knowing which database has the most white space in it.

      Simon.
      --
      Simon Butler
      Exchange MVP

      Blog: http://blog.sembee.co.uk/
      More Exchange Content: http://exchange.sembee.info/
      Exchange Resources List: http://exbpa.com/
      In the UK? Hire me: http://www.sembee.co.uk/

      Sembee is a registered trademark, used here with permission.

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      • #4
        Re: Whitespace Question Exchange 2003

        I read this on a site

        "The space it has left behind has then been consolidated, in to "white space". The size of the database hasn't changed - there is just some space within the database.
        This "white space" will be used by Exchange first, before expanding the database any larger. "

        I know we had a database that was very low and did not get any smaller for a long period of time as long as there was ample whitespace. I just needed to hear a few opinions, thanks for the response!

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        • #5
          Re: Whitespace Question Exchange 2003

          Thanks a lot Sembee, I appreciate the comment!

          I have some storage groups that are very low, I do not think offline defrag is the way to go, maybe creating a new store on the same server and moving all the mailboxes to it, then delete the old store and recreat it?

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          • #6
            Re: Whitespace Question Exchange 2003

            If you are running Enterprise edition then the recreate Store and Move Mailboxes method is preferred. It avoids downtime and can be done in a controlled manner.
            If you are running Standard edition then that is not available to you.

            Simon.
            --
            Simon Butler
            Exchange MVP

            Blog: http://blog.sembee.co.uk/
            More Exchange Content: http://exchange.sembee.info/
            Exchange Resources List: http://exbpa.com/
            In the UK? Hire me: http://www.sembee.co.uk/

            Sembee is a registered trademark, used here with permission.

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