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My control files are multiplexed. If one of my controlfiles are deleted when my database is up and running, what will be the status of the database? Will it show an error as soon as the multiplexed control file is deleted, or it will show error on next startup, and why?
If you lose a multiplexed copy, Oracle may continue to stay running. Or, it may crash, depending on the operations attempted on the control files. In any case, you will not be able to start the database with a missing control file. But there are no worries, as you will be able to copy one of the remaining control files to replace the missing one and start your instance.