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Oracle® Database Reference
11g Release 2 (11.2)

E40402-14
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V$ASM_FILE

In an Oracle Automatic Storage Management (Oracle ASM) instance, V$ASM_FILE displays one row for each file in each disk group mounted by the Oracle ASM instance. For example, if there are three disk groups and five files in each, fifteen rows are displayed (unless the query is qualified with a WHERE clause).

Column Datatype Description
GROUP_NUMBER NUMBER Number of the disk group containing the file (composite primary key)
FILE_NUMBER NUMBER Number of the file within the disk group (composite primary key)
COMPOUND_INDEX NUMBER A 32-bit number consisting of a disk group number in the high-order 8 bits and a file number in the low-order 24 bits (for efficient access to the view)
INCARNATION NUMBER Incarnation number for the file (composite primary key)
BLOCK_SIZE NUMBER Block size of the file (in bytes)
BLOCKS NUMBER Number of blocks in the file
BYTES NUMBER Number of bytes in the file
SPACE NUMBER Number of bytes allocated to the file
TYPE VARCHAR2(64) Type of the file. Possible values are as follows:
  • CONTROLFILE

  • DATAFILE

  • ONLINELOG

  • ARCHIVELOG

  • TEMPFILE

  • BACKUPSET

  • XTRANSPORT

  • PARAMETERFILE

  • DATAGUARDCONFIG

  • FLASHBACK

  • CHANGETRACKING

  • DUMPSET

  • AUTOBACKUP

REDUNDANCY VARCHAR2(6) Redundancy of the file:
  • UNPROT

  • MIRROR

  • HIGH

STRIPED VARCHAR2(6) Indicates how the file is striped:
  • FINE

  • COARSE

CREATION_DATE DATE Date on which the file was created
MODIFICATION_DATE DATE Date of the last open/close for writing, rounded back to the nearest hour
REDUNDANCY_LOWERED VARCHAR2(1) Indicates whether a file has lower redundancy than what was expected (Y) or not (N). Redundancy is said to have been lowered for a file when one or more data extents in that file are not mirrored at the level specified by the administrator. In case of unprotected files, data extents could be missing altogether. Another possible value for this column is (U), which means that it is unknown.

This column is deprecated, and it always displays a value of U.

PERMISSIONS VARCHAR2(16) Access permissions of the file, in order of user, group, and other
USER_NUMBER NUMBER User number
USER_INCARNATION NUMBER Incarnation number of the user
USERGROUP_NUMBER NUMBER User group number
USERGROUP_INCARNATION NUMBER Incarnation number of the user group
PRIMARY_REGION VARCHAR2(4) Region used for allocating primary extents:
  • HOT

  • COLD

MIRROR_REGION VARCHAR2(4) Region for allocating mirrored extents:
  • HOT

  • COLD

HOT_READS NUMBER Number of reads from the hot region for the file
HOT_WRITES NUMBER Number of writes to the hot region for the file
HOT_BYTES_READ NUMBER Number of bytes read from the hot region for the file
HOT_BYTES_WRITTEN NUMBER Number of bytes written to the hot region for the file
COLD_READS NUMBER Number of reads from the cold region for the file
COLD_WRITES NUMBER Number of writes to the cold region for the file
COLD_BYTES_READ NUMBER Number of bytes read from the cold region for the file
COLD_BYTES_WRITTEN NUMBER Number of bytes written to the cold region for the file