99.9% uptime? / upgrade?...
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%?
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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