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difference b/n database upgrade and migration

  • April 10, 2009 at 12:04 am

    #133036

    hi all,

    i'm confused about upgradation/migration. what is basic difference b/n these two. How can we do these?

    thanks,

    🙂

  • April 10, 2009 at 12:41 am

    #975587

    Basically, with a migration scenario, you install a fresh sqlserver (not necessarily on a new box) of the edition you want to migrate to, and then you copy the databases, jobs, ....

    With sql2005 you will start with e.g. xp_cmdshell not activated. (new defaults for sql2005)

    So you end up with a new sqlserver to connect to.

    With an in place upgrade scenario, you "install" the new version over the old version.

    This way, the installation procedure will keep all settings that were active in the previous version, so the instance will keep on working.

    Which scenario to chose ?

    I prefer migration to a new instance, mainly because of disaster recovery procedures !

    When migration to a new instance, you'll be confronted with "missing" settings during your test fase.

    So you will get confronted at upgrade time and not at disaster time.

    All needed settings will get documented and will be available in case of emergency.

    With an in place upgrade scenario, in case of disaster, you should first install your old sqlserver version, reconstruct all settings as before the upgrade to the new version, perform the upgrade to the new version and then restore all databases.

    If you don't perform it this way, you may end up with things not working because they are "off by default". This will only add up to the stress level at DRP time !

    Johan

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