SUMMARY_STAT_DATABASE

Displays the summary of the status information about each database node in the cluster. It is used on CNs. The status information of each node in the database is summed up by database name. 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_DATABASE columns
Name	Type	Description
datname	name	Database name.
numbackends	bigint	Number of backends currently connected to this database.
xact_commit	numeric	Number of transactions in this database that have been committed.
xact_rollback	numeric	Number of transactions in this database that have been rolled back.
blks_read	numeric	Number of disk blocks read in this database.
blks_hit	numeric	Number of disk blocks that have been hit in the cache. In this case, data does not need to be read from disks. (The cache includes only the buffer cache and does not include the file system cache of the OS.)
tup_returned	numeric	Number of live rows fetched by sequential scans and number of index rows returned by index scans in the database.
tup_fetched	numeric	Number of rows returned by the current database through indexes.
tup_inserted	bigint	Number of rows inserted.
tup_updated	bigint	Number of rows updated.
tup_deleted	bigint	Number of rows deleted.
conflicts	bigint	Number of queries canceled due to conflicts with database replay (conflicts occur only on the standby node). For details, see STAT_DATABASE_CONFLICTS.
temp_files	numeric	Number of temporary files created by queries in this database. All temporary files are counted, which is not affected by the value of the GUC parameter log_temp_files.
temp_bytes	numeric	Total amount of data written to temporary files by queries in this database. All temporary files are counted, which is not affected by the value of the GUC parameter log_temp_files.
deadlocks	bigint	Number of deadlocks detected in this database.
blk_read_time	double precision	Time spent reading data file blocks by backends in this database (unit: ms).
blk_write_time	double precision	Time spent in writing data file blocks by backends in this database (unit: ms).
stats_reset	timestamp with time zone	Time at which the current statistics were reset.