The next section goes into ASM deployment in a database.

How Are ASM Files Used in the Database?

ASM files are Oracle managed files. Unless the ASM files are created using an alias name, they are treated as Oracle managed files and deleted when no longer in use.

Default disk groups can be created for use when creating data files, control files, temp files, redo log files, etc. The name of the default disk group will be stored in an initialization parameter file and is not specified during file creation using ASM files. 

The following initialization parameters take the ASM filenames or ASM directory names as destinations: log_archive_dest, log_archive_dest_n, and standby_archive_dest. These initialization parameters take the ASM filenames as destinations: control_files, db_create_file_dest, db_create_online_log_dest_n, and db_recovery_file_dest.

Here is an example of how to create a datafile using a default disk group specified by an initialization parameter setting. The initialization parameter file is set as follows and then a tablespace is created:

DB_CREATE_FILE_DEST = ‘+dskgrp01’
CREATE TABLESPACE SALESDATA;