STATISTICS VIEW · Statistics view

pg_stat_database

PostgreSQL documentation ↗Source definition ↗

The pg_stat_database view will contain one row for each database in the cluster, plus one for shared objects, showing database-wide statistics.

First seen PG 9.0Last seen PG 19Columns 30

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

Checked column by column against a PostgreSQL 18.6 instance · Raw measurement record ↗

Columns PostgreSQL 18

pg_stat_database

COLUMN	TYPE	DESCRIPTION
`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`	Number of rows deleted by queries in this database
`conflicts`	`bigint`	Number of queries canceled due to conflicts with recovery in this database. (Conflicts occur only on standby servers; see pg_stat_database_conflicts for details.)
`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 (e.g., 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 disabled.
`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 disabled.
`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)
`blk_write_time`	`double precision`	Time spent writing 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 pg_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
`parallel_workers_to_launch`	`bigint`	Number of parallel workers planned to be launched by queries on this database
`parallel_workers_launched`	`bigint`	Number of parallel workers launched by queries on this database
`stats_reset`	`timestamp with time zone`	Time at which these statistics were last reset

Columns marked "implicit" are not included in SELECT *; some early statistics views are completed from same-version source, and the extra provenance is shown in the column description.

Column evolution matrix

Hover a cell for the column type

PresentAdded / type or attribute changeRemoved

COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12	13	14	15	16	17
`datid`
`datname`
`numbackends`
`xact_commit`
`xact_rollback`
`blks_read`
`blks_hit`
`tup_returned`
`tup_fetched`
`tup_inserted`
`tup_updated`
`tup_deleted`
`conflicts`	–
`stats_reset`	–
`temp_files`	–	–
`temp_bytes`	–	–
`deadlocks`	–	–
`blk_read_time`	–	–
`blk_write_time`	–	–
`checksum_failures`	–	–	–	–	–	–	–	–	–
`checksum_last_failure`	–	–	–	–	–	–	–	–	–
`session_time`	–	–	–	–	–	–	–	–	–	–	–
`active_time`	–	–	–	–	–	–	–	–	–	–	–
`idle_in_transaction_time`	–	–	–	–	–	–	–	–	–	–	–
`sessions`	–	–	–	–	–	–	–	–	–	–	–
`sessions_abandoned`	–	–	–	–	–	–	–	–	–	–	–
`sessions_fatal`	–	–	–	–	–	–	–	–	–	–	–
`sessions_killed`	–	–	–	–	–	–	–	–	–	–	–
`parallel_workers_to_launch`	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`parallel_workers_launched`	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–

9.0 is the coverage baseline; a column already present in the baseline is not marked as added. The matrix aligns columns by name, so a rename appears as the old column removed and a new column added.

Evolution timeline

Changes between adjacent majors

PostgreSQL 19 ← 18

2 column description updates

PostgreSQL 18 ← 17

+ parallel_workers_to_launch+ parallel_workers_launched2 column description updates

PostgreSQL 15 ← 14

2 column description updates

PostgreSQL 14 ← 13

+ session_time+ active_time+ idle_in_transaction_time+ sessions+ sessions_abandoned+ sessions_fatal+ sessions_killed

PostgreSQL 13 ← 12

4 column description updatesCatalog description updated

PostgreSQL 12 ← 11

+ checksum_failures+ checksum_last_failure3 column description updatesCatalog description updated

PostgreSQL 10 ← 9.6

Catalog description updated

PostgreSQL 9.6 ← 9.5

Catalog description updated

PostgreSQL 9.5 ← 9.4

Catalog description updated

PostgreSQL 9.4 ← 9.3

Catalog description updated

PostgreSQL 9.2 ← 9.1

+ temp_files+ temp_bytes+ deadlocks+ blk_read_time+ blk_write_timeCatalog description updated

PostgreSQL 9.1 ← 9.0

+ conflicts+ stats_resetCatalog description updated

Compare any two versions

FROMTOInclude description updates

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