Guidelines for Planning Zones
When planning the number and size of the zones on the Database Domains, consider the following points:
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The number of zones that you want to create in that Database Domain. The maximum number of zones per domain is 8.
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The size of the Database Domain, which will determine the number of cores available for that domain and the zones that can be created in that Database Domain.
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The number of cores that you want to assign to each zone in that Database Domain, keeping in mind that two or four cores will always be set aside for the global zone (the Database Domain)
You can have zones that are highly isolated or highly flexible.
