DBA_SEGMENTS_OLD lists information about storage allocated for all database segments.
| 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) |
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) |
Default buffer pool for the object |