In the v$database view, there is a column named controlfile_sequence# -- what does it indicate?
All Data Dictionary and Dynamic Performance views are explained in the Oracle documentation, specifically, the Reference Guide. The V$DATABASE view is described here.
When the control file is modified, Oracle increments this value. All of your database's control files should have the same value. If not, Oracle knows that one (or more) of the control files is older than the others. When this happens, the ORA-00214 error is raised.
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