Initialization Parameters, 38 of 188

DB_FILES

Parameter type:
Integer

Parameter class:
Static

Default value:
Operating system dependent

Range of values:
Minimum: the current actual number of datafiles in the database
Maximum: the value that was specified in the MAXDATAFILES clause the last time CREATE DATABASE or CREATE CONTROLFILE was executed

Oracle Parallel Server:
You must set this parameter for every instance, and 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, 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, they should have the same value for this parameter.

Note: The checkpoint process is enabled automatically if DB_FILES >= 50 or DB_BLOCK_BUFFERS >= 10000. At these values, switching checkpoint processing from the logwriter to a separate process is deemed to improve performance.

See Also:

Oracle8i Parallel Server Administration, Deployment, and Performance for information on setting this parameter in an Oracle Parallel Server environment.

Your operating system specific Oracle documentation for the default value of this parameter.

Parameter type:	Integer
Parameter class:	Static
Default value:	Operating system dependent
Range of values:	Minimum: the current actual number of datafiles in the database Maximum: the value that was specified in the `MAXDATAFILES` clause the last time `CREATE` `DATABASE` or `CREATE` `CONTROLFILE` was executed
Oracle Parallel Server:	You must set this parameter for every instance, and 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`, 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, they should have the same value for this parameter.
Note: The checkpoint process is enabled automatically if `DB_FILES` >= 50 or `DB_BLOCK_BUFFERS` >= 10000. At these values, switching checkpoint processing from the logwriter to a separate process is deemed to improve performance.
See Also: Oracle8i Parallel Server Administration, Deployment, and Performance for information on setting this parameter in an Oracle Parallel Server environment. Your operating system specific Oracle documentation for the default value of this parameter.