pg_stat_database

The pg_stat_database view provides cumulative statistics for each database in the cluster. It includes metrics such as the number of committed and rolled-back transactions, disk block reads and cache hits, tuples returned or fetched, and counts of inserted, updated, and deleted rows. This view is useful for monitoring overall database activity and performance.

column	type	references	description
gp_segment_id	integer		Unique identifier of a segment (or coordinator) instance.
datid	oid		OID of this database, or 0 for objects belonging to a shared relation.
datname	name		Name of this database, or NULL for shared objects.
numbackends	integer		Number of backends currently connected to this database, or NULL for shared objects. This is the only column in this view that returns a value reflecting current state; all other columns return the accumulated values since the last reset.
xact_commit	bigint		Number of transactions in this database that have been committed.
xact_rollback	bigint		Number of transactions in this database that have been rolled back.
blks_read	bigint		Number of disk blocks read in this database.
blks_hit	bigint		Number of times disk blocks were found already in the buffer cache, so that a read was not necessary (this only includes hits in the PostgreSQL buffer cache, not the operating system's file system cache).
tup_returned	bigint		Number of live rows fetched by sequential scans and index entries returned by index scans in this database.
tup_fetched	bigint		Number of live rows fetched by index scans in this database.
tup_inserted	bigint		Number of rows inserted by queries in this database.
tup_updated	bigint		Number of rows updated by queries in this database.
`tup_deleted	bigint`	bigint
conflicts	bigint		Number of queries canceled due to conflicts with recovery in this database.
temp_files	bigint		Number of temporary files created by queries in this database. All temporary files are counted, regardless of why the temporary file was created (for example, sorting or hashing), and regardless of the log_temp_files setting.
temp_bytes	bigint		Total amount of data written to temporary files by queries in this database. All temporary files are counted, regardless of why the temporary file was created, and regardless of the log_temp_files setting.
deadlocks	bigint		Number of deadlocks detected in this database.
checksum_failures	bigint		Number of data page checksum failures detected in this database (or on a shared object), or NULL if data checksums are not enabled.
checksum_last_failure	timestamp with time zone		Time at which the last data page checksum failure was detected in this database (or on a shared object), or NULL if data checksums are not enabled.
blk_read_time	double precision		Time spent reading data file blocks by backends in this database, in milliseconds (if track_io_timing is enabled, otherwise zero).
session_time	double precision		Time spent by database sessions in this database, in milliseconds (note that statistics are only updated when the state of a session changes, so if sessions have been idle for a long time, this idle time won't be included).
active_time	double precision		Time spent executing SQL statements in this database, in milliseconds (this corresponds to the states active and fastpath function call in pg_stat_activity).
idle_in_transaction_time	double precision		Time spent idling while in a transaction in this database, in milliseconds (this corresponds to the states idle in transaction and idle in transaction (aborted) in gp_stat_activity)
sessions	bigint		Total number of sessions established to this database.
sessions_abandoned	bigint		Number of database sessions to this database that were terminated because connection to the client was lost.
sessions_fatal	bigint		Number of database sessions to this database that were terminated by fatal errors.
sessions_killed	bigint		Number of database sessions to this database that were terminated by operator intervention.
stats_reset	timestamp with time zone		Time at which these statistics were last reset.