What are the advantages of variable extent size support for large ASM files? (Choose two.)
A.
It improves resync operations when the disk comes online after being taken offline for
maintenance purposes.
B.
It improves performance in the extended cluster configuration by reading from a local copy of
an extent.
C.
Fewer extent pointers are needed to describe the file and less memory is required to manage
the extent maps in the shared pool.
D.
This feature enables faster file opens because of the reduction in the amount of memory that is
required to store file extents.
Extents
The contents of ASM files are stored in a disk group as a set, or collection, of data extents that are stored on individual disks within disk groups. Each extent resides on an individual disk. Extents consist of one or more allocation units (AU). To accommodate increasingly larger files, ASM uses variable size extents.
Variable size extents enable support for larger ASM datafiles, reduce SGA memory requirements for very large databases, and improve performance for file create and open operations.