PG_STAT_DATABASE

PG_STAT_DATABASE contains database statistics for each database in the MogDB.

Table 1 PG_STAT_DATABASE columns

Name	Type	Description
datid	oid	OID of a database
datname	name	Name of the database
numbackends	integer	Number of backends currently connected to this database. This is the only column in this view that returns a value reflecting the 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 rows returned by queries in this database
tup_fetched	bigint	Number of rows fetched by queries 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 database recovery conflicts (conflicts occurring only on the standby server). For details, see PG_STAT_DATABASE_CONFLICTS.
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
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 writing into data file blocks by backends in this database (unit: ms)
stats_reset	timestamp with time zone	Time at which the current statistics were reset