But there are two reasons why
this is not an appropriate conclusion:
1. If youlose more than one disk in a striped array or mirror-pair, youwill lose the
data on those disks. This type of event is statistically rare, but if it does occur,
you could be faced with a damaged or lost control file. As you would have your
hands full recovering from the multiple disk failures, you would likely prefer to
avoid rebuilding control files during the recovery process. Multiplexing your
control files, even when each copy is on redundant disk storage, provides an
additional level of physical security.
2. Redundant disk storage does nothing to protect you from the perpetual threat of
human error. Someone could inadvertently delete or rename a control file, copy
another file over it, or move it. A mirrored disk will faithfully mirror these
actions, and multiplexed control files will leave you with one or more surviving
copies of the control file when one of the copies is damaged or lost.
Youdo not need to be concerned with additional performance impact when writing
to multiple control files.
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