BACKUP_TAPE_IO_SLAVES

Property	Description
Parameter type	Boolean
Default value	false
Modifiable	ALTER SYSTEM ... DEFERRED
Range of values	true | false
Basic	No

BACKUP_TAPE_IO_SLAVES specifies whether I/O server processes (also called slaves) are used by Recovery Manager to back up, copy, or restore data to tape. When the value is set to true, Oracle uses an I/O server process to write to or read from a tape device. When the value is set to false (the default), Oracle does not use I/O server process for backups. Instead, the shadow process engaged in the backup accesses the tape device.

Note:

1. You cannot perform duplexed backups unless you enable this parameter. Otherwise, Oracle returns an error. When this parameter is enabled, Recovery Manager will configure as many server processes as needed for the number of backup copies requested.

2. This parameter was introduced in Oracle 8.0

3. Query for the current value of the parameter

select name, value, isdefault, isses_modifiable, issys_modifiable,

isinstance_modifiable, isdeprecated, description

from v$parameter where upper(name) = 'BACKUP_TAPE_IO_SLAVES';

NAME	VALUE	IS DEFAULT	ISSES_ MODIFIABLE	ISSYS_ MODIFIABLE	ISINSTANCE_ MODIFIABLE	IS DEPRECATED	DESCRIPTION
backup_tape_io_slaves	FALSE	TRUE	FALSE	DEFERRED	TRUE	FALSE	BACKUP Tape I/O slaves

Oracle initializatoin parameters