Help Center/ GaussDB/ Distributed_8.x/ Schemas/ DBE_PERF Schema/ Object/ SUMMARY_STAT_SYS_TABLES

Updated on 2024-06-03 GMT+08:00

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SUMMARY_STAT_SYS_TABLES

Displays the status statistics of all system catalogs in the pg_catalog, information_schema, and pg_toast schemas in the cluster. The statistics are used on CNs and include data on CNs and DNs. The status information in the system catalog on each node is summed up. The timestamp column is not summed up and only the latest value of this column on all nodes is used, as described in Table 1.

**Table 1** SUMMARY_STAT_SYS_TABLES columns
Name	Type	Description
schemaname	name	Name of the schema where the table is located.
relname	name	Table name.
seq_scan	numeric	Number of sequential scans initiated on the table.
seq_tup_read	numeric	Number of live rows fetched by sequential scans.
idx_scan	numeric	Number of index scans initiated on the table.
idx_tup_fetch	numeric	Number of live rows fetched by index scans.
n_tup_ins	numeric	Number of rows inserted.
n_tup_upd	numeric	Number of rows updated.
n_tup_del	numeric	Number of rows deleted.
n_tup_hot_upd	numeric	Number of HOT updated rows (that is, the number of rows whose index columns are not updated).
n_live_tup	numeric	Estimated number of live rows.
n_dead_tup	numeric	Estimated number of inactive rows.
last_vacuum	timestamp with time zone	Last time at which this table was manually vacuumed (not counting VACUUM FULL).
last_autovacuum	timestamp with time zone	Last time when the table was vacuumed by the autovacuum daemon thread.
last_analyze	timestamp with time zone	Last time at which the table was manually analyzed.
last_autoanalyze	timestamp with time zone	Last time when the table was analyzed by the autovacuum daemon thread.
vacuum_count	numeric	Number of times this table is manually vacuumed (excluding VACUUM FULL).
autovacuum_count	numeric	Number of times this table has been vacuumed by the autovacuum daemon.
analyze_count	numeric	Number of times the table has been manually analyzed.
autoanalyze_count	numeric	Number of times the table has been analyzed by the autovacuum daemon thread.