How can I find out what objects are in a datafile???

My database is 8.1.7...
I have a tablespace with multiple datafiles. How can I find out what objects are in a specific datafile???
Thanks in advance...

DBA_SEGMENTS
DBA_SEGMENTS describes the storage allocated for all segments in the database.
Related View
USER_SEGMENTS describes the storage allocated for the segments owned by the current user's objects. This view does not display the OWNER, HEADER_FILE, HEADER_BLOCK, or RELATIVE_FNO columns.
Column Datatype NULL Description
OWNER
VARCHAR2(30)
Username of the segment owner
SEGMENT_NAME
VARCHAR2(81)
Name, if any, of the segment
PARTITION_NAME
VARCHAR2(30)
Object Partition Name (Set to NULL for non-partitioned objects)
SEGMENT_TYPE
VARCHAR2(17)
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 this 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)
Default buffer pool for the object
This view with this another viwe can help you to identify where the object is:
DBA_DATA_FILES
DBA_DATA_FILES describes database files.
Column Datatype NULL Description
FILE_NAME
VARCHAR2(513)
Name of the database file
FILE_ID
NUMBER
NOT NULL
File identifier number of the database file
TABLESPACE_NAME
VARCHAR2(30)
NOT NULL
Name of the tablespace to which the file belongs
BYTES
NUMBER
Size of the file in bytes
BLOCKS
NUMBER
NOT NULL
Size of the file in Oracle blocks
STATUS
VARCHAR2(9)
File status: AVAILABLE or INVALID (INVALID means that the file number is not in use, for example, a file in a tablespace that was dropped)
RELATIVE_FNO
NUMBER
Relative file number
AUTOEXTENSIBLE
VARCHAR2(3)
Autoextensible indicator
MAXBYTES
NUMBER
Maximum file size in bytes
MAXBLOCKS
NUMBER
Maximum file size in blocks
INCREMENT_BY
NUMBER
Autoextension increment
USER_BYTES
NUMBER
Corresponding number of bytes
USER_BLOCKS
NUMBER
Number of blocks which can be used by the data
Joel Pérez
http://otn.oracle.com/experts

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