Your organization must carefully evaluate the risks to its primary site.
These risks include physical and environmental problems as well as hardware risks.
For example, is the data center in an area prone to floods, tornadoes, or earthquakes?
Are power failures a frequent occurrence? Earlier versions of this book treated events
such as ???a terrorist attack or an airplane crash into the data center??? as remote possibilities,
but, unfortunately, these scenarios no longer seem so implausible.
Protection from primary site failure involves monitoring of and redundancy controls
for the following:
??? Data center power supply
??? Data center climate control facilities
??? Database server redundancy
??? Database redundancy
??? Data redundancy
282 | Chapter 11: Oracle and High Availability
The first three items on the list are aimed at preventing the failure of the data center.
Data server redundancy, through simple hardware failover or Real Application Clusters,
provides protection from node failure within a data center but not from
complete data center loss.
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