ALL_TAB_COL_STATISTICS provides column statistics and histogram information extracted from "ALL_TAB_COLUMNS".
DBA_TAB_COL_STATISTICS provides such information extracted from "DBA_TAB_COLUMNS".
USER_TAB_COL_STATISTICS provides such information extracted from "USER_TAB_COLUMNS".
| Column | Datatype | NULL | Description |
|---|---|---|---|
OWNER |
VARCHAR2(30) |
Table owner | |
TABLE_NAME |
VARCHAR2(30) |
Table name | |
COLUMN_NAME |
VARCHAR2(30) |
Column name | |
NUM_DISTINCT |
NUMBER |
Number of distinct values in the column | |
LOW_VALUE |
RAW(32) |
Low value in the column | |
HIGH_VALUE |
RAW(32) |
High value in the column | |
DENSITY |
NUMBER |
Density of the column | |
NUM_NULLS |
NUMBER |
Number of nulls in the column | |
NUM_BUCKETS |
NUMBER |
Number of buckets in histogram for the column | |
LAST_ANALYZED |
DATE |
Date on which this column was most recently analyzed | |
SAMPLE_SIZE |
NUMBER |
Sample size used in analyzing this column | |
GLOBAL_STATS |
VARCHAR2(3) |
For partitioned tables, indicates whether column statistics were collected for the table as a whole (YES) or were estimated from statistics on underlying partitions and subpartitions (NO) |
|
USER_STATS |
VARCHAR2(3) |
Indicates whether statistics were entered directly by the user (YES) or not (NO) |
|
AVG_COL_LEN |
NUMBER |
Average length of the column (in bytes) | |
HISTOGRAM |
VARCHAR2(15) |
Indicates existence/type of histogram:
|