99.9% uptime? / upgrade?...
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Thread: 99.9% uptime? / upgrade?...

  1. #1
    Join Date
    Jun 2006
    Posts
    101

    99.9% uptime? / upgrade?...

    Hello,

    I wondered how do big companies upgrade they database system without down time?
    I understand high availability stuff like RAC,Data guard etc ...
    But canít get my head around of transferring data from system a to new system (b) or upgrading system a with no down time, itís possible at all? I have seen people claiming 99.9% up time ...is this is the other 0.01%?

  2. #2
    Join Date
    Mar 2007
    Location
    Ft. Lauderdale, FL
    Posts
    3,554
    Our SLA is also 99.9% up time, here is how it works... 99.9% up time PLUS scheduled maintenance windows time.

    You do your stuff during maintenance window.
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

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