Normal behavior.
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The installer replaces current files with previous backup.
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The patch history is missing (files are not found in the directory defined by the parameter PATCH_HISTORY_DIR in patch.conf)
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Without the history, the installer cannot determine which backups to use. Since there is nothing to replace them with, the installer does not remove the current files.
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You did not specify the most recent patch.
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The history indicates that the patch is not the newest backup. The installer must use the most recent backup to roll back.
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The backups are missing (expected files are not found in the directory defined by the parameter PATCH_BACKUP_DIR in patch.conf).
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Since there is nothing to replace them with, the installer does not remove the current files.
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The installer is partway through the roll back when there is a problem. The cluster contains some older files and some newer files.
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If the installer cannot complete, it reverses the rollback actions, removing the older files and returning the newer ones.
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