ALL_CLUSTERS describes all clusters accessible to the current user.

Related Views

  • DBA_CLUSTERS describes all clusters in the database.

  • USER_CLUSTERS describes all clusters owned by the current user. This view does not display the OWNER column.

Column Datatype NULL Description
OWNER VARCHAR2(30) NOT NULL Owner of the cluster
CLUSTER_NAME VARCHAR2(30) NOT NULL Name of the cluster
TABLESPACE_NAME VARCHAR2(30) NOT NULL Name of the tablespace containing the cluster
PCT_FREE NUMBER   Minimum percentage of free space in a block
PCT_USED NUMBER   Minimum percentage of used space in a block
KEY_SIZE NUMBER   Estimated size of cluster key plus associated rows
INI_TRANS NUMBER NOT NULL Initial number of transactions
MAX_TRANS NUMBER NOT NULL Maximum number of transactions
INITIAL_EXTENT NUMBER   Size of the initial extent in bytes
NEXT_EXTENT NUMBER   Size of secondary extents in bytes
MIN_EXTENTS NUMBER NOT NULL Minimum number of extents allowed in the segment
MAX_EXTENTS NUMBER NOT NULL Maximum number of extents allowed in the segment
PCT_INCREASE NUMBER   Percentage increase in extent size
FREELISTS NUMBER   Number of process freelists allocated to this segment
FREELIST_GROUPS NUMBER   Number of freelist groups allocated to this segment
AVG_BLOCKS_PER_KEY NUMBER   Number of blocks in the table divided by number of cluster keys
CLUSTER_TYPE VARCHAR2(5)   Type of the cluster:
  • INDEX - B*-Tree index

  • HASH - Hash

FUNCTION VARCHAR2(15)   If the cluster is a hash cluster, the hash function
HASHKEYS NUMBER   If the cluster is a hash cluster, the number of hash keys (hash buckets)
DEGREE VARCHAR2(10)   Number of threads per instance for scanning the cluster, or DEFAULT
INSTANCES VARCHAR2(10)   Number of instances across which the cluster is to be scanned , or DEFAULT
CACHE VARCHAR2(5)   Indicates whether the cluster is to be cached in the buffer cache (Y) or not (N)
BUFFER_POOL VARCHAR2(7)   Default buffer pool for the cluster:

  • KEEP


  • NULL

SINGLE_TABLE VARCHAR2(5)   Indicates whether this is a single-table cluster (Y) or not (N)
DEPENDENCIES VARCHAR2(8)   Indicates whether row-level dependency tracking is enabled (ENABLED) or disabled (DISABLED)