ALL_SUBPART_COL_STATISTICS

ALL_SUBPART_COL_STATISTICS describes column statistics and histogram information for subpartitions of partitioned objects accessible to the current user.

Column Datatype NULL Description
OWNER VARCHAR2(128) NOT NULL Owner of the table
TABLE_NAME VARCHAR2(128) NOT NULL Name of the table
SUBPARTITION_NAME VARCHAR2(128)   Table subpartition name
COLUMN_NAME VARCHAR2(4000)   Column name
NUM_DISTINCT NUMBER   Number of distinct values in the column
LOW_VALUE RAW(1000)   Low value in the column
HIGH_VALUE RAW(1000)   High value in the column
DENSITY NUMBER  

If a histogram is available on COLUMN_NAME, then this column displays the selectivity of a value that spans fewer than 2 endpoints in the histogram. It does not represent the selectivity of values that span 2 or more endpoints.

If a histogram is not available on COLUMN_NAME, then the value of this column is 1/NUM_DISTINCT.

NUM_NULLS NUMBER   Number of NULLs in the column
NUM_BUCKETS NUMBER   Number of buckets in histogram for the column
SAMPLE_SIZE NUMBER   Sample size used in analyzing this column
LAST_ANALYZED DATE   Date on which this column was most recently analyzed
GLOBAL_STATS VARCHAR2(3)   GLOBAL_STATS will be YES if statistics have been gathered or NO if statistics have not been gathered
USER_STATS VARCHAR2(3)   Indicates whether statistics were entered directly by the user (YES) or not (NO)
NOTES VARCHAR2(41)   Describes some additional properties of the statistics. For example, if the value is INCREMENTAL, the global statistics are derived from synopses, that is, the global statistics are incrementally maintained.
AVG_COL_LEN NUMBER   Average length of the column (in bytes)
HISTOGRAM VARCHAR2(15)  

Indicates existence/type of histogram:

  • NONE

  • FREQUENCY

  • HEIGHT BALANCED

  • HYBRID

  • TOP-FREQUENCY

See Also: