pg_statistic_ext_data
The catalog pg_statistic_ext_data
holds data for extended planner statistics defined in pg_statistic_ext.
Each row in this catalog corresponds to a statistics object
created with CREATE STATISTICS.
Like pg_statistic,
pg_statistic_ext_data should not be
readable by the public, since the contents might be considered sensitive.
(Example: most common combinations of values in columns might be quite
interesting.)
pg_stats_ext
is a publicly readable view
on pg_statistic_ext_data (after joining
with pg_statistic_ext) that only exposes
information about those tables and columns that are readable by the
current user.
Table 52.52. pg_statistic_ext_data Columns
| Name | Type | References | Description |
|---|---|---|---|
stxoid | oid | | Extended statistic object containing the definition for this data |
stxdndistinct | pg_ndistinct |
N-distinct counts, serialized as pg_ndistinct type
| |
stxddependencies | pg_dependencies |
Functional dependency statistics, serialized
as pg_dependencies type
| |
stxdmcv | pg_mcv_list |
MCV (most-common values) list statistics, serialized as
pg_mcv_list type
|