Explanation/Reference:
Explanation:
Templates are used to set attributes of files created in an Oracle ASM disk group.
When a file is created, redundancy and striping attributes are set for that file based on an explicitly named template or the system template that is the default template for the file type.
When a disk group is created, Oracle ASM creates a set of default templates for that disk group. The set consists of one template for each file type (data file, control file, redo log file, and so on) that is supported by Oracle ASM. For example, a template named ONLINELOG provides the default file redundancy and striping attributes for all redo log files written to Oracle ASM disks. Default template settings depend on the disk group type. The default template for data files for a normal redundancy disk group sets two-way mirroring, while the corresponding default template in a high redundancy disk group sets three-way mirroring. You can modify these default templates.