Real Application Clusters Multiple instances must have the same value.
DB_FILES specifies the maximum number of database files
that can be opened for this database. The maximum valid value is the
maximum number of files, subject to operating system constraint, that
will ever be specified for the database, including files to be added by ADD DATAFILE statements.
If you increase the value of DB_FILES, then you must
shut down and restart all instances accessing the database before the
new value can take effect. If you have a primary and standby database,
then they should have the same value for this parameter.
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