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DBAs like a cold backup because the backup is consistent across the
board. More than anything, they like the comfort factor of a nice,
consistent backup. Hot backups will result in inconsistencies in the
backed up datafiles. RMAN will resolve these inconsistencies on
recovery, after a restore. For many DBAs, it is a comfort factor.
That being said, there are two areas to consider. If you perform a cold
backup, you must have downtime for your database. If you cannot afford
the downtime, then a cold backup is not for you. If you want or need to
perform a hot backup, then you must be running in archive log mode.
Cold backups are easy, do not require archived redo logs, but require
downtime. Hot backups do not require any downtime, but are a little
more complex and require archived redo logs.
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