The pg_statistic_ext_data system catalog table 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.

column type references description
stxoid oid pg_statistic_ext.oid  The 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.

Parent topic: System Catalogs Definitions

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