Skip Headers
Oracle® Database Reference
10g Release 2 (10.2)

Part Number B14237-02
Go to Documentation Home
Home
Go to Book List
Book List
Go to Table of Contents
Contents
Go to Index
Index
Go to Master Index
Master Index
Go to Feedback page
Feedback

Go to previous page
Previous
Go to next page
Next
View PDF

V$ASM_DISKGROUP

In an Automatic Storage Management instance, V$ASM_DISKGROUP displays one row for every disk group discovered by the Automatic Storage Management instance. In a database instance, V$ASM_DISKGROUP displays one row for every Automatic Storage Management disk group mounted by the local Automatic Storage Management instance.

Column Datatype Description
GROUP_NUMBER NUMBER Cluster-wide number assigned to the disk group (primary key)
NAME VARCHAR2(30) Name of the disk group
SECTOR_SIZE NUMBER Physical block size (in bytes)
BLOCK_SIZE NUMBER Automatic Storage Management metadata block size (in bytes)
ALLOCATION_UNIT_SIZE NUMBER Size of the allocation unit (in bytes)
STATE VARCHAR2(11) State of the disk group relative to the instance:
  • CONNECTED - Disk group is in use by the database instance

  • BROKEN - Database instance lost connectivity to the Automatic Storage Management instance that mounted the disk group

  • UNKNOWN - Automatic Storage Management instance has never attempted to mount the disk group

  • DISMOUNTED - Disk group was cleanly dismounted by the Automatic Storage Management instance following a successful mount

  • MOUNTED - Instance is successfully serving the disk group to its database clients

TYPE VARCHAR2(6) Redundancy type for the disk group:
  • EXTERN

  • NORMAL

  • HIGH

TOTAL_MB NUMBER Total capacity of the disk group (in megabytes)
FREE_MB NUMBER Unused capacity of the disk group (in megabytes)
REQUIRED_MIRROR_FREE_MB NUMBER Amount of space that is required to be available in a given disk group in order to restore redundancy after one or more disk failures. The amount of space displayed in this column takes mirroring effects into account.
USABLE_FILE_MB NUMBER Amount of free space that can be safely utilized taking mirroring into account, and yet be able to restore redundancy after a disk failure
OFFLINE_DISKS NUMBER Number of disks in the disk group that are currently offline
UNBALANCED VARCHAR2(1) Indicates whether the disk group requires a rebalance, for example, if the instance crashed while a rebalance operation was pending (Y) or not (N)
COMPATIBILITY VARCHAR2(60) The minimum software version required for an ASM instance to mount this disk group
DATABASE_COMPATIBILITY VARCHAR2(60) The minimum software version required for a database instance to use files in this disk group


Note:

The GROUP_NUMBER, TOTAL_MB, and FREE_MB columns are only meaningful if the disk group is mounted by the instance. Otherwise, their values will be 0.