Information
Oracle control files store information critical to Oracle database integrity. Oracle uses these files to maintain time synchronization of database files and verify the validity of system data and log files at system startup. Loss of access to the control files can affect database availability, integrity, and recovery.
Oracle Pluggable Databases (PDBs) do not contain their own control files; instead, all PDBs within a Container Database (CDB) share control files managed by the CDB.
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Solution
To prevent loss of service during disk failure, multiple copies of Oracle control files must be maintained on separate disks in archived directories or on separate, archived directories within one or more RAID devices.
Adding or moving a control file requires careful planning and execution.
Consult and follow the instructions for creating control files in the Oracle Database Administrator's Guide, under Steps for Creating New Control Files.