51.52. 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 51.52.
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
|