https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/managing-control-files.html#GUID-204AF8CF-6C51-4D0F-ADE2-BA804352EA93 :
You have two options:
Back up the control file to a binary file (duplicate of existing control file) using the following statement:
> ALTER DATABASE BACKUP CONTROLFILE TO '/oracle/backup/control.bkp';
Produce SQL statements that can later be used to re-create your control file:
> ALTER DATABASE BACKUP CONTROLFILE TO TRACE;
This command writes a SQL script to a trace file where it can be captured and edited to reproduce the control file.
View the alert log to determine the name and location of the trace file.
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