|Range of values||Minimum: the largest among the absolute file numbers of the datafiles in the database
Maximum: operating system-dependent
|Oracle RAC||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.
Oracle Real Application Clusters Administration and Deployment Guide for information on setting this parameter in an Oracle RAC environment
Your operating system-specific Oracle documentation for the default value of this parameter