OWNER | 
VARCHAR2(30) | 
  | 
Username of the segment owner | 
SEGMENT_NAME | 
VARCHAR2(81) | 
  | 
Name, if any, of the segment | 
PARTITION_NAME | 
VARCHAR2(30) | 
  | 
Name of the partition | 
SEGMENT_TYPE | 
VARCHAR2(18) | 
  | 
Type of segment: INDEX PARTITION, TABLE PARTITION, TABLE, CLUSTER, INDEX, ROLLBACK, DEFERRED ROLLBACK, TEMPORARY, CACHE, LOBSEGMENT and LOBINDEX | 
TABLESPACE_NAME | 
VARCHAR2(30) | 
  | 
Name of the tablespace containing the segment | 
HEADER_FILE | 
NUMBER | 
  | 
ID of the file containing the segment header | 
HEADER_BLOCK | 
NUMBER | 
  | 
ID of the block containing the segment header | 
BYTES | 
NUMBER | 
  | 
Size, in bytes, of the segment | 
BLOCKS | 
NUMBER | 
  | 
Size, in Oracle blocks, of the segment | 
EXTENTS | 
NUMBER | 
  | 
Number of extents allocated to the segment | 
INITIAL_EXTENT | 
NUMBER | 
  | 
Size in bytes requested for the initial extent of the segment at create time. (Oracle rounds the extent size to multiples of 5 blocks if the requested size is greater than 5 blocks.) | 
NEXT_EXTENT | 
NUMBER | 
  | 
Size in bytes of the next extent to be allocated to the segment | 
MIN_EXTENTS | 
NUMBER | 
  | 
Minimum number of extents allowed in the segment | 
MAX_EXTENTS | 
NUMBER | 
  | 
Maximum number of extents allowed in the segment | 
PCT_INCREASE | 
NUMBER | 
  | 
Percent by which to increase the size of the next extent to be allocated | 
FREELISTS | 
NUMBER | 
  | 
Number of process freelists allocated to the segment | 
FREELIST_GROUPS | 
NUMBER | 
  | 
Number of freelist groups allocated to this segment | 
RELATIVE_FNO | 
NUMBER | 
  | 
Relative file number of the segment header | 
BUFFER_POOL | 
VARCHAR2(7) | 
  | 
Buffer pool for the object |