Can External Tables Be Placed inside ASM diskgroups [ID 470989.1]

External Tables cannot be created inside ASM diskgroup.

1 ) ASM cannot store external tables in ASM diskgroups since external tables are flat ASCII files which are not a file type supported in ASM, therefore external tables must be allocated on regular filesystem files.

2) The supported ASM files are described in the next manual:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/storeman.htm#i1021337

==> 12 Using Automatic Storage Management

Table 12-8 Oracle File Types and Automatic Storage Management File Type Tags

Automatic Storage Management file_type	Description	Automatic Storage Management file_type_tag	Comments
CONTROLFILE	Control files and backup control files	Current Backup	--
DATAFILE	Datafiles and datafile copies	tsname	Tablespace into which the file is added
ONLINELOG	Online logs	group_group#	--
ARCHIVELOG	Archive logs	thread_thread#_seq_sequence#	--
TEMPFILE	Tempfiles	tsname	Tablespace into which the file is added
BACKUPSET	Datafile and archive log backup pieces; datafile incremental backup pieces	hasspfile_timestamp	hasspfile can take one of two values: s indicates that the backup set includes the spfile; n indicates that the backup set does not include the spfile.
PARAMETERFILE	Persistent parameter files	spfile
DAATAGUARDCONFIG	Data Guard configuration file	db_unique_name	Data Guard tries to use the service provider name if it is set. Otherwise the tag defaults to DRCname.
FLASHBACK	Flashback logs	log_log#	--
CHANGETRACKING	Block change tracking data	ctf	Used during incremental backups
DUMPSET	Data Pump dumpset	user_obj#_file#	Dump set files encode the user name, the job number that created the dump set, and the file number as part of the tag.
XTRANSPORT	Datafile convert	tsname	--
AUTOBACKUP	Automatic backup files	hasspfile_timestamp	hasspfile can take one of two values: s indicates that the backup set includes the spfile; n indicates that the backup set does not include the spfile.

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