When you enable mirroring, you invoke the database server functionality required for mirroring tasks. However, when you enable mirroring, you do not initiate the mirroring process. Mirroring does not actually start until you create mirror chunks for a dbspace. See Using Mirroring.
Enable mirroring when you initialize the database server if you plan to create a mirror for the root dbspace as part of initialization; otherwise, leave mirroring disabled. If you later decide to mirror a storage space, you can change the value of the MIRROR configuration parameter.
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