Which type of database file is spread across all disks in a disk group?
A. All types of files are spread across all disks in the disk group.
B. Datafiles
C. Redo log files
D. Archived redo log files
E. Control files
All types of database files are spread across all disks in the disk group to ensure redundancy unless the redundancy is set to EXTERNAL.
原文：http://www.cnblogs.com/Babylon/p/7803561.html