Incomplete Oracle ASM file names are used only for file creation operations and are used for both single and multiple file creation. They consist only of the disk group name. Oracle ASM uses a system default template to determine the Oracle ASM file mirroring and striping attributes. The system template that is used is determined by the file type that is being created. For example, if you are creating a data file for a tablespace, then the DATAFILE template is used.
An example of using an incomplete Oracle ASM file name is setting the DB_CREATE_FILE_DEST initialization parameter to:
+data
With this setting, every time you create a tablespace, a data file is created in the disk group data, and each data file is assigned a different fully qualified name. See "Creating Oracle ASM Files Using a Default File Location for Disk Group Specification" for more information.