PG_STAT_OBJECT

Records table statistics and autovacuum efficiency information of the current DB instance, and creates indexes for the databaseid, relid, and partid columns. Update of this system catalog is controlled by the enable_pg_stat_object parameter. This system catalog is supported only by clusters of version 8.2.1 or later.

**Table 1** PG_STAT_OBJECT columns
Column	Type	Reference	Description
databaseid	oid	PG_DATABASE.oid	OID of the database.
relid	oid	PG_CLASS.oid	OID of the table. It is the OID of the primary table for a partitioned table.
partid	oid	PG_PARTITION .oid	Partition OID. For an ordinary table, the value of this column is 0.
numscans	bigint	-	Number of times that sequential scans are started.
tuples_returned	bigint	-	Number of visible tuples fetched by sequential scans.
tuples_fetched	bigint	-	Number of visible tuples fetched.
tuples_inserted	bigint	-	Number of inserted records.
tuples_updated	bigint	-	Number of updated records.
tuples_deleted	bigint	-	Number of deleted records.
tuples_hot_updated	bigint	-	Number of HOT updates.
n_live_tuples	bigint	-	Number of visible tuples.
last_autovacuum_begin_n_dead_tuple	bigint	-	Number of tuples deleted before Autovacuum is executed.
n_dead_tuples	bigint	-	Number of tuples deleted after Autovacuum is successful.
changes_since_analyze	bigint	-	Last data modification time after Analyze.
blocks_fetched	bigint	-	Number of selected pages.
blocks_hit	bigint	-	Number of scanned pages.
cu_mem_hit	bigint	-	Number of CU memory hits.
cu_hdd_sync	bigint	-	Times that CUs are synchronously read from disks.
cu_hdd_asyn	bigint	-	Times that CUs are asynchronously read from disks.
data_changed_timestamp	timestamp with time zone	-	Last data modification time.
data_access_timestamp	timestamp with time zone	-	Last access time of a table.
analyze_timestamp	timestamp with time zone	-	Last Analyze time.
analyze_count	bigint	-	Total number of Analyze times.
autovac_analyze_timestamp	timestamp with time zone	-	Last Autoanalyze time.
autovac_analyze_count	bigint	-	Total number of Autoanalyze times.
vacuum_timestamp	timestamp with time zone	-	Time of the latest Vacuum.
vacuum_count	bigint	-	Total number of Vacuum times.
autovac_vacuum_timestamp	timestamp with time zone	-	Last Autovacuum time.
autovac_vacuum_count	bigint	-	Total number of Autovacuum times.
autovacuum_success_count	bigint	-	Total number of successful Autovacuum operations.
last_autovacuum_time_cost	bigint	-	Time spent on the latest successful Autovacuum, in microseconds.
avg_autovacuum_time_cost	bigint	-	Average execution time of successful Autovacuum operations. Unit: μs.
last_autovacuum_failed_count	bigint	-	Total number of autovacuum failures since the last successful Autovacuum.
last_autovacuum_trigger	smallint	-	Triggering mode of the latest autovacuum, which helps maintenance personnel determine the Vacuum status.
last_autovacuum_oldestxmin	bigint	-	oldestxmin after the latest successful Autovacuum execution. If the table-level oldestxmin feature is enabled, this field records the value of oldestxmin used by the latest (AUTO)VACUUM of the table.
last_autovacuum_scan_pages	bigint	-	Number of pages last scanned by autovacuum (only for row-store tables).
last_autovacuum_dirty_pages	bigint	-	Number of pages last modified by Autovacuum (only for row-store tables).
last_autovacuum_clear_deadtuples	bigint	-	Number of dead tuples last cleared by Autovacuum (only for row-store tables)
sum_autovacuum_scan_pages	bigint	-	Total number of pages scanned by Autovacuum since database initialization (only for row-store tables).
sum_autovacuum_dirty_pages	bigint	-	Number of pages modified by Autovacuum since database initialization (only for row-store tables).
sum_autovacuum_clear_deadtuples	bigint	-	Total number of dead tuples cleared by Autovacuum since database initialization (only for row-store tables).
last_autovacuum_begin_cu_size	bigint	-	Size of the CU file before the latest Autovacuum operation (only for column-store tables)
last_autovacuum_cu_size	bigint	-	Size of the CU file after the latest Autovacuum (only for column-store tables)
last_autovacuum_rewrite_size	bigint	-	Size of the column-store file last rewritten by autovacuum (only for column-store tables).
last_autovacuum_clear_size	bigint	-	Size of the column-store file last cleared by Autovacuum (only for column-store tables).
last_autovacuum_clear_cbtree_tuples	bigint	-	Number of cbtree tuples last cleared by Autovacuum (only for column-store tables)
sum_autovacuum_rewrite_size	bigint	-	Total size of column-store files rewritten by Autovacuum since database initialization (only for column-store tables).
sum_autovacuum_clear_size	bigint	-	Total size of column-store files cleared by Autovacuum since database initialization (only for column-store tables).
sum_autovacuum_clear_cbtree_tuples	bigint	-	Total number of cbtree tuples cleared by Autovacuum since database initialization (only for column-store tables).
last_autovacuum_csn	bigint	-	If the table-level oldestxmin feature is enabled, this field records the CSN value corresponding to the latest oldestxmin value used by the table (AUTO)VACUUM.
extra1	bigint	-	Reserved field 1.
extra2	bigint	-	Reserved field 2.
extra3	bigint	-	Reserved field 3.
extra4	bigint	-	Reserved field 4.