Statistics Information Functions

Statistics information functions are divided into the following two categories: functions that access databases, using the OID of each table or index in a database to mark the database for which statistics are generated; functions that access servers, identified by the server process ID, whose value ranges from 1 to the number of currently active servers.

• global_comm_get_status()

  Description: Obtains the communication library status of all DNs.

  Return type: record

• global_comm_get_send_stream()

  Description: Obtains the sending stream status of all communication libraries on all DNs.

  Return type: record

• global_comm_get_recv_stream()

  Description: Obtains the receiving stream status of all communication libraries on all DNs.

  Return type: record

• global_comm_get_client_info()

  Description: Obtains information about client connections of global nodes.

  Return type: record

• pg_stat_get_db_conflict_tablespace(oid)

  Description: Specifies the number of queries canceled due to a conflict between the restored tablespace and the deleted tablespace in the database.

  Return type: bigint

• pg_control_group_config

  Description: Prints Cgroup configurations on the current node.

  Return type: record

• pg_stat_get_db_stat_reset_time(oid)

  Description: Specifies the most recent time when database statistics were reset. It is initialized to the system time during the first connection to each database. The reset time is updated when you call pg_stat_reset on the database and execute pg_stat_reset_single_table_counters against any table or index in it.

  Return type: timestamptz

• pg_stat_get_function_total_time(oid)

  Description: Specifies the total wall clock time spent in the function, in microseconds. The time spent on this function calling other functions is included.

  Return type: bigint

• pg_stat_get_xact_tuples_returned(oid)

  Description: Specifies the number of rows read through sequential scans when the parameter is a table in the current transaction or the number of index entries returned when the parameter is an index.

  Return type: bigint

• pg_lock_status()

  Description: Queries information about locks held by open transactions. All users can execute this function.

  Return type: For details, see PG_LOCKS which is obtained by querying this function.

• pg_stat_get_xact_numscans(oid)

  Description: Specifies the number of sequential scans performed when the parameter is a table in the current transaction or the number of index scans performed when the parameter is an index.

  Return type: bigint

• pg_stat_get_xact_blocks_fetched(oid)

  Description: Specifies the number of disk block fetch requests for a table or an index in the current transaction.

  Return type: bigint

• pg_stat_get_xact_blocks_hit(oid)

  Description: Specifies the number of disk block fetch requests for tables or indexes found in cache in the current transaction.

  Return type: bigint

• pg_stat_get_xact_function_calls(oid)

  Description: Specifies the number of times the function is called in the current transaction.

  Return type: bigint

• pg_stat_get_xact_function_self_time(oid)

  Description: Specifies the time spent on this function in the current transaction, excluding the time spent on this function internally calling other functions.

  Return type: bigint

• pg_stat_get_xact_function_total_time(oid)

  Description: Specifies the total wall clock time (in microseconds) spent on the function in the current transaction, including the time spent on this function internally calling other functions.

  Return type: bigint

• pg_stat_get_wal_senders()

  Description: Queries walsender information on the primary server.

  Return type: setofrecord

  The following table describes return columns.

  Table 1 Return column description

  Column	Type	Description
  pid	bigint	Thread ID of the WAL sender
  sender_pid	integer	Lightweight thread ID of the WAL sender
  local_role	text	Type of the primary node
  peer_role	text	Type of the standby node
  peer_state	text	Status of the standby node
  state	text	Status of the WAL sender
  catchup_start	timestamp with time zone	Startup time of a catchup task
  catchup_end	timestamp with time zone	End time of a catchup task
  sender_sent_location	text	Sending position of the primary node
  sender_write_location	text	Writing position of the primary node
  sender_flush_location	text	Flushing position of the primary node
  sender_replay_location	text	Redo position of the primary node
  receiver_received_location	text	Receiving position of the standby node
  receiver_write_location	text	Writing position of the standby node
  receiver_flush_location	text	Flushing position of the standby node
  receiver_replay_location	text	Redo position of the standby node
  sync_percent	text	Synchronization percentage
  sync_state	text	Synchronization status
  sync_priority	text	Priority of synchronous replication
  sync_most_available	text	Maximum availability mode
  channel	text	Channel information of the WAL sender

• get_paxos_replication_info()

  Description: Queries the primary/standby replication status in Paxos mode.

  Return type: setofrecord

  The following table describes return columns.

  Table 2 Return column description

  Column	Type	Description
  paxos_write_location	text	Location of the Xlog that has been written to the Distribute Consensus Framework (DCF)
  paxos_commit_location	text	Location of the Xlog agreed in the DCF
  local_write_location	text	Writing position of a node
  local_flush_location	text	Flushing position of a node
  local_replay_location	text	Redo position of a node
  dcf_replication_info	text	DCF module information of a node

• pg_stat_get_stream_replications()

  Description: Queries the primary/standby replication status.

  Return type: setofrecord

  The following table describes return values.

  Table 3 Return value description

  Return Parameter	Type	Description
  local_role	text	Local role
  static_connections	integer	Connection statistics
  db_state	text	Database status
  detail_information	text	Detailed information

• pg_stat_get_db_numbackends(oid)

  Description: Specifies the number of active server processes for a database.

  Return type: integer

• pg_stat_get_db_xact_commit(oid)

  Description: Specifies the number of transactions committed in a database.

  Return type: bigint

• pg_stat_get_db_xact_rollback(oid)

  Description: Specifies the number of transactions rolled back in a database.

  Return type: bigint

• pg_stat_get_db_blocks_fetched(oid)

  Description: Specifies the number of disk blocks fetch requests for a database.

  Return type: bigint

• pg_stat_get_db_blocks_hit(oid)

  Description: Specifies the number of disk block fetch requests found in cache for a database.

  Return type: bigint

• pg_stat_get_db_tuples_returned(oid)

  Description: Specifies the number of tuples returned for a database.

  Return type: bigint

• pg_stat_get_db_tuples_fetched(oid)

  Description: Specifies the number of tuples fetched for a database.

  Return type: bigint

• pg_stat_get_db_tuples_inserted(oid)

  Description: Specifies the number of tuples inserted in a database.

  Return type: bigint

• pg_stat_get_db_tuples_updated(oid)

  Description: Specifies the number of tuples updated in a database.

  Return type: bigint

• pg_stat_get_db_tuples_deleted(oid)

  Description: Specifies the number of tuples deleted in a database.

  Return type: bigint

• pg_stat_get_db_conflict_lock(oid)

  Description: Specifies the number of lock conflicts in a database.

  Return type: bigint

• pg_stat_get_db_deadlocks(oid)

  Description: Specifies the number of deadlocks in a database.

  Return type: bigint

• pg_stat_get_numscans(oid)

  Description: Specifies the number of sequential row scans done if parameters are in a table or the number of index scans done if parameters are in an index.

  Return type: bigint

• pg_stat_get_role_name(oid)

  Description: Obtains the username based on the user OID. Only users with the sysadmin or monitor admin permission can access the information.

  Return type: text

  Example:

  mogdb=# select pg_stat_get_role_name(10);
   pg_stat_get_role_name
  -----------------------
   aabbcc
  (1 row)

• pg_stat_get_tuples_returned(oid)

  Description: Specifies the number of sequential row scans done if parameters are in a table or the number of index scans done if parameters are in an index.

  Return type: bigint

• pg_stat_get_tuples_fetched(oid)

  Description: Specifies the number of table rows fetched by bitmap scans if parameters are in a table or the number of table rows fetched by simple index scans using the index if parameters are in an index.

  Return type: bigint

• pg_stat_get_tuples_inserted(oid)

  Description: Specifies the number of rows inserted into a table.

  Return type: bigint

• pg_stat_get_tuples_updated(oid)

  Description: Specifies the number of rows updated in a table.

  Return type: bigint

• pg_stat_get_tuples_deleted(oid)

  Description: Specifies the number of rows deleted from a table.

  Return type: bigint

• pg_stat_get_tuples_changed(oid)

  Description: Specifies the total number of inserted, updated, and deleted rows after a table was last analyzed or autoanalyzed.

  Return type: bigint

• pg_stat_get_tuples_hot_updated(oid)

  Description: Specifies the number of rows hot updated in a table.

  Return type: bigint

• pg_stat_get_live_tuples(oid)

  Description: Specifies the number of live rows in a table.

  Return type: bigint

• pg_stat_get_dead_tuples(oid)

  Description: Specifies the number of dead rows in a table.

  Return type: bigint

• pg_stat_get_blocks_fetched(oid)

  Description: Specifies the number of disk block fetch requests for a table or an index.

  Return type: bigint

• pg_stat_get_blocks_hit(oid)

  Description: Specifies the number of disk block requests found in cache for a table or an index.

  Return type: bigint

• pg_stat_get_partition_tuples_inserted(oid)

  Description: Specifies the number of rows in the corresponding table partition.

  Return type: bigint

• pg_stat_get_partition_tuples_updated(oid)

  Description: Specifies the number of rows that have been updated in the corresponding table partition.

  Return type: bigint

• pg_stat_get_partition_tuples_deleted(oid)

  Description: Specifies the number of rows deleted from the corresponding table partition.

  Return type: bigint

• pg_stat_get_partition_tuples_changed(oid)

  Description: Specifies the total number of inserted, updated, and deleted rows after a table partition was last analyzed or autoanalyzed.

  Return type: bigint

• pg_stat_get_partition_live_tuples(oid)

  Description: Specifies the number of live rows in a partitioned table.

  Return type: bigint

• pg_stat_get_partition_dead_tuples(oid)

  Description: Specifies the number of dead rows in a partitioned table.

  Return type: bigint

• pg_stat_get_xact_tuples_fetched(oid)

  Description: Specifies the number of tuple rows scanned in a transaction.

  Return type: bigint

• pg_stat_get_xact_tuples_inserted(oid)

  Description: Specifies the number of tuple inserted into the active subtransactions related to a table.

  Return type: bigint

• pg_stat_get_xact_tuples_deleted(oid)

  Description: Specifies the number of deleted tuples in the active subtransactions related to a table.

  Return type: bigint

• pg_stat_get_xact_tuples_hot_updated(oid)

  Description: Specifies the number of hot updated tuples in the active subtransactions related to a table.

  Return type: bigint

• pg_stat_get_xact_tuples_updated(oid)

  Description: Specifies the number of updated tuples in the active subtransactions related to a table.

  Return type: bigint

• pg_stat_get_xact_partition_tuples_inserted(oid)

  Description: Specifies the number of inserted tuples in the active subtransactions related to a table partition.

  Return type: bigint

• pg_stat_get_xact_partition_tuples_deleted(oid)

  Description: Specifies the number of deleted tuples in the active subtransactions related to a table partition.

  Return type: bigint

• pg_stat_get_xact_partition_tuples_hot_updated(oid)

  Description: Specifies the number of hot updated tuples in the active subtransactions related to a table partition.

  Return type: bigint

• pg_stat_get_xact_partition_tuples_updated(oid)

  Description: Specifies the number of updated tuples in the active subtransactions related to a table partition.

  Return type: bigint

• pg_stat_get_last_vacuum_time(oid)

  Description: Specifies the most recent time when the autovacuum thread is manually started to clear a table.

  Return type: timestamptz

• pg_stat_get_last_autovacuum_time(oid)

  Description: Specifies the time of the last vacuum initiated by the autovacuum daemon on a table.

  Return type: timestamptz

• pg_stat_get_vacuum_count(oid)

  Description: Specifies the number of times a table is manually cleared.

  Return type: bigint

• pg_stat_get_autovacuum_count(oid)

  Description: Specifies the number of times the autovacuum daemon is started to clear a table.

  Return type: bigint

• pg_stat_get_last_analyze_time(oid)

  Description: Specifies the last time when a table starts to be analyzed manually or by the autovacuum thread.

  Return type: timestamptz

• pg_stat_get_last_autoanalyze_time(oid)

  Description: Specifies the time when the last analysis initiated by the autovacuum daemon on a table.

  Return type: timestamptz

• pg_stat_get_analyze_count(oid)

  Description: Specifies the number of times a table is manually analyzed.

  Return type: bigint

• pg_stat_get_autoanalyze_count(oid)

  Description: Specifies the number of times the autovacuum daemon analyzes a table.

  Return type: bigint

• pg_total_autovac_tuples(bool,bool)

  Description: Returns tuple records related to the total autovac, such as nodename, nspname, relname, and tuple IUDs. The input parameters specify whether to query relation and local information, respectively.

  Return type: setofrecord

  The following table describes return parameters.

  Table 4 Return parameter description

  Return Parameter	Type	Description
  nodename	name	Node name
  nspname	name	Name of a namespace
  relname	name	Name of an object, such as a table, an index, or a view
  partname	name	Partition name
  n_dead_tuples	bigint	Number of dead rows in a table partition
  n_live_tuples	bigint	Number of live rows in a table partition
  changes_since_analyze	bigint	Number of changes generated by ANALYZE

• pg_autovac_status(oid)

  Description: Returns autovac information, such as nodename, nspname, relname, analyze, vacuum, thresholds of analyze and vacuum, and the number of analyzed or vacuumed tuples. Only users with the sysadmin permission can use this function.

  Return type: setofrecord

  The following table describes return parameters.

  Table 5 Return parameter description

  Return Parameter	Type	Description
  nspname	text	Name of a namespace
  relname	text	Name of an object, such as a table, an index, or a view
  nodename	text	Node name
  doanalyze	Boolean	Whether to execute ANALYZE
  anltuples	bigint	Number of ANALYZE tuples
  anlthresh	bigint	ANALYZE threshold
  dovacuum	Boolean	Whether to execute VACUUM
  vactuples	bigint	Number of VACUUM tuples
  vacthresh	bigint	VACUUM threshold

• pg_autovac_timeout(oid)

  Description: Returns the number of consecutive timeouts during the autovac operation on a table. If the table information is invalid or the node information is abnormal, NULL will be returned.

  Return type: bigint

• pg_stat_get_last_data_changed_time(oid)

  Description: Returns the time when INSERT, UPDATE, DELETE, or EXCHANGE/TRUNCATE/DROP PARTITION was last performed on a table. The data in the last_data_changed column of the PG_STAT_ALL_TABLES view is calculated by using this function. The performance of obtaining the last modification time by using the view is poor when the table has a large amount of data. In this case, you are advised to use the function.

  Return type: timestamptz

• pg_stat_set_last_data_changed_time(oid)

  Description: Manually changes the time when INSERT, UPDATE, DELETE, or EXCHANGE/TRUNCATE/DROP PARTITION was last performed.

  Return type: void

• pg_backend_pid()

  Description: Specifies the thread ID of the server thread attached to the current session.

  Return type: integer

• pg_stat_get_activity(integer)

  Description: Returns a record about the backend with the specified PID. A record for each active backend in the system is returned if NULL is specified. The return results are a subnet of those (excluding the connection_info column) in the PG_STAT_ACTIVITY view.

  Example:

  mogdb=# select * from pg_stat_get_activity(139754904483584);
   datid |       pid       |    sessionid    | usesysid | application_name | state |                    query                     | waiting | xact_start |          query_start          |         backend_start         |         state_cha
  nge          | client_addr | client_hostname | client_port | enqueue | query_id | srespool | global_sessionid
  -------+-----------------+-----------------+----------+------------------+-------+----------------------------------------------+---------+------------+-------------------------------+-------------------------------+------------------
  -------------+-------------+-----------------+-------------+---------+----------+----------+------------------
   16099 | 139754904483584 | 139754904483584 |       10 | coordinator2     | idle  | SET SESSION AUTHORIZATION DEFAULT;RESET ALL; | f       |            | 2021-06-09 16:40:58.391727+08 | 2021-06-09 16:03:52.040929+08 | 2021-06-09 16:40:
  58.392143+08 | ::1         |                 |       35210 |         |        0 | unknown  | 0#0#0
  (1 row)

  Return type: setofrecord

  The following table describes return parameters.

  Table 6 Return parameter description

  Return Parameter	Type	Description
  datid	oid	OID of the database that the user session connects to in the backend
  pid	bigint	Backend thread ID
  sessionid	bigint	Session ID
  usesysid	oid	Name of the user logged in to the backend
  application_name	text	Name of the application connected to the backend
  state	text	Overall status of the backend
  query	text	Latest query at the backend. If state is active, this column shows the ongoing query. In all other states, it shows the last query that was executed.
  waiting	Boolean	Whether the backend is currently waiting on a lock. If yes, the value is true.
  xact_start	timestamp with time zone	Time when current transaction was started (null if no transaction is active). If the current query is the first of its transaction, the value of this column is the same as that of the query_start column.
  query_start	timestamp with time zone	Time when the currently active query was started, or time when the last query was started if state is not active
  backend_start	timestamp with time zone	Time when this process was started, that is, when the client connected to the server
  state_change	timestamp with time zone	Time when state was last modified
  client_addr	inet	IP address of the client connected to the backend. If this column is NULL, it indicates either the client is connected via a Unix socket on the server or this is an internal process, such as AUTOVACUUM.
  client_hostname	text	Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This column will be non-null only for IP connections and only whenlog_hostname is enabled.
  client_port	integer	TCP port number that the client uses for communication with this backend (-1 if a Unix socket is used).
  enqueue	text	Unsupported currently
  query_id	bigint	ID of a query
  global_sessionid	text	Global session ID

• pg_stat_get_activity_with_conninfo(integer)

  Description: Returns a record about the backend with the specified PID. A record for each active backend in the system is returned if NULL is specified. PG_STAT_ACTIVITY is a subset of the function.

  Return type: setofrecord

  The following table describes return values.

  Table 7 Return value description

  Return Value	Return Type	Description
  datid	oid	OID of the database that the user session connects to in the backend
  pid	bigint	Backend thread ID
  sessionid	bigint	Session ID
  usesysid	oid	Name of the user logged in to the backend
  application_name	text	Name of the application connected to the backend
  state	text	Overall status of the backend
  query	text	Latest query at the backend. If state is active, this column shows the ongoing query. In all other states, it shows the last query that was executed.
  waiting	Boolean	Whether the backend is currently waiting on a lock. If yes, the value is true
  xact_start	timestamp with time zone	Time when current transaction was started (null if no transaction is active). If the current query is the first of its transaction, the value of this column is the same as that of the query_start column.
  query_start	timestamp with time zone	Time when the currently active query was started, or time when the last query was started if state is not active
  backend_start	timestamp with time zone	Time when this process was started, that is, when the client connected to the server
  state_change	timestamp with time zone	Time when state was last modified
  client_addr	inet	IP address of the client connected to the backend If this column is NULL, it indicates either the client is connected via a Unix socket on the server or this is an internal process, such as AUTOVACUUM.
  client_hostname	text	Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This column will be non-null only for IP connections and only whenlog_hostname is enabled.
  client_port	integer	TCP port number that the client uses for communication with this backend (-1 if a Unix socket is used)
  enqueue	text	Unsupported currently
  query_id	bigint	ID of a query
  connection_info	text	A string in JSON format recording the driver type, driver version, driver deployment path, and process owner of the connected database
  global_sessionid	text	Global session ID

• pg_user_iostat(text)

  Description: Displays the I/O load management information about the job currently executed by the user.

  Return type: record

  The following table describes return fields.

  Name	Type	Description
  userid	oid	User ID
  min_curr_iops	int4	Minimum I/O of the current user across database nodes. The IOPS is counted by ones for column storage and by ten thousands for row storage.
  max_curr_iops	int4	Maximum I/O of the current user across database nodes. The IOPS is counted by ones for column storage and by ten thousands for row storage.
  min_peak_iops	int4	Minimum peak I/O of the current user across database nodes. The IOPS is counted by ones for column storage and by ten thousands for row storage.
  max_peak_iops	int4	Maximum peak I/O of the current user across database nodes. The IOPS is counted by ones for column storage and by ten thousands for row storage.
  io_limits	int4	io_limits set for the resource pool specified by the user. The IOPS is counted by ones for column storage and by ten thousands for row storage.
  io_priority	text	io_priority set for the user. The IOPS is counted by ones for column storage and by ten thousands for row storage.
  curr_io_limits	int4	Real-time io_limits value when io_priority is used to control I/Os

• pg_stat_get_function_calls(oid)

  Description: Specifies the number of times the function has been called.

  Return type: bigint

• pg_stat_get_function_self_time(oid)

  Description: Specifies the time spent in only this function. The time spent on this function calling other functions is excluded.

  Return type: bigint

• pg_stat_get_backend_idset()

  Description: Sets the number of currently active server processes (from 1 to the number of active server processes).

  Return type: setofinteger

• pg_stat_get_backend_pid(integer)

  Description: Specifies the ID of the given server thread.

  Return type: bigint

• pg_stat_get_backend_dbid(integer)

  Description: Specifies the ID of the database connected to the given server process.

  Return type: oid

• pg_stat_get_backend_userid(integer)

  Description: Specifies the user ID of the given server process.

  Return type: oid

• pg_stat_get_backend_activity(integer)

  Description: Active command of the given server process, but only if the current user is a system administrator or the same user as that of the session being queried and track_activities is on

  Return type: text

• pg_stat_get_backend_waiting(integer)

  Description: True if the given server process is waiting for a lock, but only if the current user is a system administrator or the same user as that of the session being queried and track_activities is on

  Return type: Boolean

• pg_stat_get_backend_activity_start(integer)

  Description: Specifies the time when the given server process's currently executing query is started only if the current user is the system administrator or the user of the session being queried and track_activities is enabled.

  Return type: timestamp with time zone

• pg_stat_get_backend_xact_start(integer)

  Description: Specifies the time when the given server process's currently executing transaction is started only if the current user is the system administrator or the user of the session being queried and track_activities is enabled.

  Return type: timestamp with time zone

• pg_stat_get_backend_start(integer)

  Description: Specifies the time when the given server process is started. If the current user is neither the system administrator nor the user of the session being queried, NULL is returned.

  Return type: timestamp with time zone

• pg_stat_get_backend_client_addr(integer)

  Description: Specifies the IP address of the client connected to the given server process. If the connection is over a Unix domain socket, or if the current user is neither a system administrator nor the same user as that of the session being queried, NULL will be returned.

  Return type: inet

• pg_stat_get_backend_client_port(integer)

  Description: Specifies the TCP port number of the client connected to the given server process. If the connection is over a Unix domain socket, -1 will be returned. If the current user is neither a system administrator nor the same user as that of the session being queried, NULL will be returned.

  Return type: integer

• pg_stat_get_bgwriter_timed_checkpoints()

  Description: Specifies the time when the background writer starts scheduled checkpoints (because the checkpoint_timeout time has expired).

  Return type: bigint

• pg_stat_get_bgwriter_requested_checkpoints()

  Description: Specifies the time when the background writer starts checkpoints based on requests from the backend because checkpoint_segments has been exceeded or the CHECKPOINT command has been executed.

  Return type: bigint

• pg_stat_get_bgwriter_buf_written_checkpoints()

  Description: Specifies the number of buffers written by the background writer during checkpoints.

  Return type: bigint

• pg_stat_get_bgwriter_buf_written_clean()

  Description: Specifies the number of buffers written by the background writer for routine cleaning of dirty pages.

  Return type: bigint

• pg_stat_get_bgwriter_maxwritten_clean()

  Description: Specifies the time when the background writer stops its cleaning scan because it has written more buffers than specified in the bgwriter_lru_maxpages parameter.

  Return type: bigint

• pg_stat_get_buf_written_backend()

  Description: Specifies the number of buffers written by the backend because they need to allocate a new buffer.

  Return type: bigint

• pg_stat_get_buf_alloc()

  Description: Specifies the total number of the allocated buffers.

  Return type: bigint

• pg_stat_clear_snapshot()

  Description: Discards the current statistics snapshot.

  Return type: void

• pg_stat_reset()

  Description: Resets all statistics counters for the current database to zero (requires system administrator permissions).

  Return type: void

• pg_stat_reset_shared(text)

  Description: Resets all statistics counters for the current database in each node in a shared cluster to zero (requires system administrator permissions).

  Return type: void

• pg_stat_reset_single_table_counters(oid)

  Description: Resets statistics for a single table or index in the current database to zero (requires system administrator permissions).

  Return type: void

• pg_stat_reset_single_function_counters(oid)

  Description: Resets statistics for a single function in the current database to zero (requires system administrator permissions).

  Return type: void

• pg_stat_session_cu(int, int, int)

  Description: Obtains the compression unit (CU) hit statistics of sessions running on the current node.

  Return type: record

• pg_stat_get_cu_mem_hit(oid)

  Description: Obtains the number of CU memory hits of a column storage table in the current database of the current node.

  Return type: bigint

• pg_stat_get_cu_hdd_sync(oid)

  Description: Obtains the times CU is synchronously read from a disk by a column storage table in the current database of the current node.

  Return type: bigint

• pg_stat_get_cu_hdd_asyn(oid)

  Description: Obtains the times CU is asynchronously read from a disk by a column storage table in the current database of the current node.

  Return type: bigint

• pg_stat_get_db_cu_mem_hit(oid)

  Description: Obtains the CU memory hit in a database of the current node.

  Return type: bigint

• pg_stat_get_db_cu_hdd_sync(oid)

  Description: Obtains the times CU is synchronously read from a disk by a database of the current node.

  Return type: bigint

• fenced_udf_process()

  Description: Shows the number of local UDF Master and Work processes.

  Return type: record

• total_cpu()

  Description: Obtains the CPU time used by the current node, in jiffies.

  Return type: bigint

• mot_global_memory_detail()

  Description: Checks the size of the MOT global memory, including data and indexes.

  Return type: record

• mot_local_memory_detail()

  Description: Checks the size of the MOT local memory, including data and indexes.

  Return type: record

• mot_session_memory_detail()

  Description: Checks the MOT memory usage of all sessions.

  Return type: record

• total_memory()

  Description: Obtains the size of the virtual memory used by the current node, in KB.

  Return type: bigint

• pg_stat_get_db_cu_hdd_asyn(oid)

  Description: Obtains the times CU is asynchronously read from a disk by a database of the current node.

  Return type: bigint

• pg_stat_bad_block(text, int, int, int, int, int, timestamp with time zone, timestamp with time zone)

  Description: Obtains damage information about pages or CUs after the current node is started.

  Example: select * from pg_stat_bad_block();

  Return type: record

• pg_stat_bad_block_clear()

  Description: Deletes the page and CU damage information that is read and recorded on the node (requires system administrator permissions).

  Return type: void

• gs_respool_exception_info(pool text)

  Description: Queries the query rule of a specified resource pool.

  Return type: record

• gs_control_group_info(pool text)

  Description: Queries information about Cgroups associated with a resource pool.

  Return type: record

  The command output is as follows:

  Attribute	Value	Description
  name	class_a:workload_a1	Class name and workload name
  class	class_a	Class Cgroup name
  workload	workload_a1	Workload Cgroup name
  type	DEFWD	Cgroup type (Top, CLASS, BAKWD, DEFWD, and TSWD)
  gid	87	Cgroup ID
  shares	30	Percentage of CPU resources to those on the parent node
  limits	0	Percentage of CPU cores to those on the parent node
  rate	0	Allocation ratio in Timeshare
  cpucores	0-3	Number of CPU cores

• gs_all_control_group_info()

  Description: Collects information about all Cgroups in the database.

  Return type: record

• gs_get_control_group_info()

  Description: Collects information about all Cgroups.

  Return type: record

• get_instr_workload_info(integer)

  Description: Obtains the transaction volume and time information on the primary database node.

  Return type: record

  Attribute	Value	Description
  resourcepool_oid	10	OID of the resource pool (the logic is equivalent to the load)
  commit_counter	4	Number of frontend transactions that were committed
  rollback_counter	1	Number of frontend transactions that were rolled back
  resp_min	949	Minimum response time of frontend transactions (unit: μs)
  resp_max	201891	Maximum response time of frontend transactions (unit: μs)
  resp_avg	43564	Average response time of frontend transactions (unit: μs)
  resp_total	217822	Total response time of frontend transactions (unit: μs)
  bg_commit_counter	910	Number of backend transactions that were committed
  bg_rollback_counter	0	Number of backend transactions that were rolled back
  bg_resp_min	97	Minimum response time of backend transactions (unit: μs)
  bg_resp_max	678080687	Maximum response time of backend transactions (unit: μs)
  bg_resp_avg	327847884	Average response time of backend transactions (unit: μs)
  bg_resp_total	298341575300	Total response time of backend transactions (unit: μs)

• pv_instance_time()

  Description: Obtains the time consumed in each execution phase on the current node.

  Return type: record

  Stat_name Attribute	Value	Description
  DB_TIME	1062385	Total end-to-end wall time consumed by all threads (unit: μs)
  CPU_TIME	311777	Total CPU time consumed by all threads (unit: μs)
  EXECUTION_TIME	380037	Total time consumed on the executor (unit: μs)
  PARSE_TIME	6033	Total time consumed for parsing SQL statements (unit: μs)
  PLAN_TIME	173356	Total time consumed for generating an execution plan (unit: μs)
  REWRITE_TIME	2274	Total time consumed on query rewriting (unit: μs)
  PL_EXECUTION_TIME	0	Total time consumed for executing PL/SQL statements (unit: μs)
  PL_COMPILATION_TIME	557	Total time consumed for SQL compilation (unit: μs)
  NET_SEND_TIME	1673	Total time consumed for sending data over network (unit: μs)
  DATA_IO_TIME	426622	Total time consumed for data read and write (unit: μs)

• DBE_PERF.get_global_instance_time()

  Description: Provides the time consumed in each key phase in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• get_instr_unique_sql()

  Description: Obtains information about execution statements (normalized SQL statements) on the current node as a user with the sysadmin permission.

  Return type: record

• reset_unique_sql(text, text, bigint)

  Description: Resets information about system execution statements (normalized SQL statements) information as a user with the sysadmin permission. The value of the first parameter can be global or local. global indicates that information on all nodes is cleared, and local indicates that only information on the current node is cleared. The value of the second parameter can be ALL, BY_USERID, or BY_CNID. ALL indicates that all information is cleared. BY_USERID indicates that the SQL information of the user specified by USERID is cleared. BY_CNID indicates that the SQL information related to the primary node of the database in the system is cleared. The third parameter indicates CNID and USERID. If the second parameter is set to ALL, the third parameter does not take effect and can be set to any value.

  Return type: Boolean

  NOTE: This function involves distributed nodes. Currently, MogDB is a centralized database, for which the function of the value global is the same as that of the value local and the second parameter cannot set to be BY_CNID.

• get_instr_wait_event(NULL)

  Description: Obtains the statistics on wait events of the current node.

  Return type: record

• get_instr_user_login()

  Description: Obtains the number of user login and logout times on the current node. Only users with the sysadmin or monitor admin permission can execute this function.

  Return type: record

• get_instr_rt_percentile(integer)

  Description: Obtains the SQL response time P80 and P95 distribution information of the database.

  Return type: record

• get_node_stat_reset_time()

  Description: Obtains statistics about reset (restart, primary/standby switchover, and database deletion) time of the current node.

  Return type: record

• DBE_PERF.get_global_os_runtime()

  Description: Displays the running status of the current operating system. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_os_threads()

  Description: Provides information about the threads under all normal nodes of MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_workload_sql_count()

  Description: Provides statistics about the number of SELECT, UPDATE, INSERT, DELETE, DDL, DML, and DCL statements of different service loads in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_workload_sql_elapse_time()

  Description: Provides statistics about the number of SELECT, UPDATE, INSERT, and DELETE statements and response time information (TOTAL, AVG, MIN, and MAX) for different loads in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_workload_transaction()

  Description: Obtains the transaction volume and time information on all nodes of MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_session_stat()

  Description: Obtains the session status information on all nodes of MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

  NOTE: The status information contains the following 17 items: commit, rollback, sql, table_scan, blocks_fetched, physical_read_operation, shared_blocks_dirtied, local_blocks_dirtied, shared_blocks_read, local_blocks_read, blocks_read_time, blocks_write_time, sort_imemory, sort_idisk, cu_mem_hit, cu_hdd_sync_read, and cu_hdd_asyread.

• DBE_PERF.get_global_session_time()

  Description: Provides the time consumed in each key phase of each node in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_session_memory()

  Description: Displays statistics about memory usage at the session level on each node in the unit of MB, including all the memory allocated to Postgres and stream threads on DNs for jobs currently executed by users. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_session_memory_detail()

  Description: Displays statistics about thread memory usage on each node by MemoryContext node. To query this function, you must have the sysadmin permission.

  Return type: record

• create_wlm_session_info(int flag)

  Description: Clears top SQL query statement-level statistics recorded in the current memory. Only the administrator can execute this function.

  Return type: int

• pg_stat_get_wlm_session_info(int flag)

  Description: Obtains top SQL query statement-level statistics recorded in the current memory. If the input parameter is not 0, the information is cleared from the memory. Only users with the system admin or monitor admin permission can execute this function.

  Return type: record

• gs_paxos_stat_replication()

  Description: Queries the standby server information on the primary server. Currently, only the centralized DCF mode is supported.

  Return type: setofrecord

  The following table describes return columns.

  Column	Type	Description
  local_role	text	Role of the node that sends logs
  peer_role	text	Role of the node that receives logs
  local_dcf_role	text	DCF role of the node that sends logs
  peer_dcf_role	text	DCF role of the node that receives logs
  peer_state	text	Status of the node that receives logs
  sender_write_location	text	Location in the Xlog buffer where the node that sends logs is written
  sender_commit_location	text	Consistency point reached for the DCF logs of the node that sends logs
  sender_flush_location	text	Location in the Xlog disk where the node that sends logs is written
  sender_replay_location	text	Location where the node that sends logs replays logs
  receiver_write_location	text	Location in the Xlog buffer where the node that receives logs is written
  receiver_commit_location	text	Consistency point reached for the DCF logs of the node that receives logs
  receiver_flush_location	text	Location in the Xlog disk where the node that receives logs is written
  receiver_replay_location	text	Location where the node that receives logs replays Xlogs
  sync_percent	text	Synchronization percentage
  dcf_run_mode	int4	DCF synchronization mode
  channel	text	Channel information

• gs_wlm_get_resource_pool_info(int)

  Description: Obtains resource usage statistics of all users. The input parameter can be any value of the INT type or be null.

  Return type: record

• gs_wlm_get_all_user_resource_info()

  Description: Obtains the resource usage statistics of all users.

  Return type: record

• gs_wlm_get_user_info(int)

  Description: Obtains information about all users. The input parameter can be any value of the INT type or be null. Only users with the sysadmin permission can execute this function.

  Return type: record

• gs_wlm_get_workload_records()

  Description: Obtains all job information in dynamic load management. This function is valid only when dynamic load management is enabled.

  Return type: record

• gs_wlm_readjust_user_space()

  Description: Corrects the storage space usage of all users. Only the administrator can execute this function.

  Return type: record

• gs_wlm_readjust_user_space_through_username(text name)

  Description: Corrects the storage space usage of a specified user. Common users can use this function to modify only their own usage. Only the administrator can modify the usage of all users. If the value of name is 0000, the usage of all users needs to be modified.

  Return type: record

• gs_wlm_readjust_user_space_with_reset_flag(text name, boolean isfirst)

  Description: Corrects the storage space usage of a specified user. If the input parameter isfirst is set to true, statistics are collected from 0. Otherwise, statistics are collected from the previous result. Common users can use this function to modify only their own usage. Only the administrator can modify the usage of all users. If the value of name is 0000, the usage of all users needs to be modified.

  Return type: record

• gs_wlm_session_respool(bigint)

  Description: Obtains the session resource pool information about all backend threads. The input parameter can be any value of the bigint type or can be null.

  Return type: record

• gs_wlm_get_session_info()

  Description: This API has been discarded and is unavailable currently.

• gs_wlm_get_user_session_info()

  Description: This API has been discarded and is unavailable currently.

• gs_io_wait_status()

  Description: This API does not support single-node systems or centralized systems and is unavailable currently.

• global_stat_get_hotkeys_info()

  Description: Obtains the statistics of hot keys in the entire cluster. This API does not support single-node systems or centralized systems and is unavailable currently.

• global_stat_clean_hotkeys()

  Description: Clears statistics on hot keys in the entire cluster. This API does not support single-node systems or centralized systems and is unavailable currently.

• DBE_PERF.get_global_session_stat_activity()

  Description: Displays information about threads that are running on each node in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_thread_wait_status()

  Description: Displays the block waiting status of backend threads and auxiliary threads on all nodes. To query this function, you must have the sysadmin or monitoradmin permission.

  Return type: record

• DBE_PERF.get_global_operator_history_table()

  Description: Displays the operator-related records (persistent) generated after jobs are executed on the primary database node of the current user. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_operator_history()

  Description: Displays the operator-related records generated after jobs are executed on the primary database node of the current user. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_operator_runtime()

  Description: Displays real-time operator-related records of jobs executed on the primary database node of the current user. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statement_complex_history()

  Description: Displays the historical records of complex queries on the primary database node of the current user. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statement_complex_history_table()

  Description: Displays the historical records (persistent) of complex queries on the primary database node of the current user. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statement_complex_runtime()

  Description: Displays the real-time information of complex queries on the primary database node of the current user. To query this function, you must have the sysadmin or monadmin permission.

  Return type: record

• DBE_PERF.get_global_memory_node_detail()

  Description: Displays the memory usage of a certain database on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_shared_memory_detail()

  Description: Displays the usage information about all the shared memory contexts of all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statio_all_indexes()

  Description: Displays statistics about each index displayed in a row in the current database, showing I/O statistics about accesses to that specific index. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_stat_all_tables()

  Description: Displays statistics about a row in each table (including the TOAST table) on each node.

  Return type: record

• DBE_PERF.get_global_stat_all_tables()

  Description: Displays statistics about a row in each table (including the TOAST table) on each node.

  Return type: record

• DBE_PERF.get_local_toastname_and_toastindexname()

  Description: Provides the mapping between the name and index of the local TOAST table and its associated table. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_statio_all_indexes()

  Description: Collects statistics about each index displayed in a row in the current databases of all nodes and displays the I/O statistics of a specific index. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statio_all_sequences()

  Description: Provides I/O status information about all sequences in the namespace. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statio_all_tables()

  Description: Displays the I/O statistics about each table in databases on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_statio_all_tables()

  Description: Collects I/O statistics about each table in databases in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_local_toast_relation()

  Description: Provides the mapping between the name of the local TOAST table and its associated table. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statio_sys_indexes()

  Description: Displays the I/O status information about all system catalog indexes in namespaces on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_statio_sys_indexes()

  Description: Collects the I/O status information about all system catalog indexes in namespaces on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statio_sys_sequences()

  Description: Provides the I/O status information about all the system sequences in the namespace. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statio_sys_tables()

  Description: Provides I/O status information about all system catalogs in namespaces on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_statio_sys_tables()

  Description: Displays the I/O status information of all system catalogs in the namespace in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statio_user_indexes()

  Description: Displays the I/O status information about all user relationship table indexes in namespaces on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_statio_user_indexes()

  Description: Displays the I/O status information about all user relationship table indexes in namespaces in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statio_user_sequences()

  Description: Displays the I/O status information about all user sequences in the namespace of each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_statio_user_tables()

  Description: Displays the I/O status information about all user relationship tables in namespaces on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_statio_user_tables()

  Description: Displays the I/O status information about all user relationship tables in namespaces in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_stat_db_cu()

  Description: Queries CU hits in a database and in each node in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_all_indexes()

  Description: Displays statistics of each index in databases on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_stat_all_indexes()

  Description: Collects statistics of each index in all databases on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_sys_tables()

  Description: Displays statistics about the system catalogs of all the namespaces in pg_catalog and information_schema schemas on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_stat_sys_tables()

  Description: Collects statistics about the system catalogs of all the namespaces in pg_catalog and information_schema schemas on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_sys_indexes()

  Description: Displays index status information about all the system catalogs in the pg_catalog and information_schema schemas on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_stat_sys_indexes()

  Description: Collects statistics about index status information about all the system catalogs in the pg_catalog and information_schema schemas on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_user_tables()

  Description: Displays the status information about customized ordinary tables in all namespaces. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_stat_user_tables()

  Description: Collects statistics about the status information about customized ordinary tables in all namespaces. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_user_indexes()

  Description: Displays the status information about the index of customized ordinary tables in all databases. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_stat_user_indexes()

  Description: Collects statistics about the status information about the index of customized ordinary tables in all databases. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_database()

  Description: Displays database statistics of all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_database_conflicts()

  Description: Collects statistics on the database of all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_xact_all_tables()

  Description: Displays transaction status information about all ordinary tables and TOAST tables in all namespaces. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_stat_xact_all_tables()

  Description: Collects statistics about transaction status information about all ordinary tables and TOAST tables in all namespaces. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_xact_sys_tables()

  Description: Displays transaction status information about all system catalogs in namespaces on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_stat_xact_sys_tables()

  Description: Collects statistics about transaction status information about all system catalogs in namespaces on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_xact_user_tables()

  Description: Displays the transaction status information of the user tables in the namespaces on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_stat_xact_user_tables()

  Description: Collects statistics about the transaction status information of the user tables in the namespaces on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_user_functions()

  Description: Displays the transaction status information of customized functions in the namespaces on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_xact_user_functions()

  Description: Collects statistics about the transaction status information of customized functions in the namespaces on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_stat_bad_block()

  Description: Displays information about table and index read failures on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_file_redo_iostat()

  Description: Collects statistics on information about table and index read failures on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_file_iostat()

  Description: Displays statistics about data file I/Os on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_locks()

  Description: Displays lock information of all nodes. To query this function, you must have the sysadmin or monadmin permission.

  Return type: record

• DBE_PERF.get_global_replication_slots()

  Description: Displays logical replication information on all nodes. To query this function, you must have the sysadmin or monadmin permission.

  Return type: record

• DBE_PERF.get_global_bgwriter_stat()

  Description: Displays statistics about the background writer process's activities on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_replication_stat()

  Description: Displays information about log synchronization status on each node, such as the locations where the sender sends logs and where the receiver receives logs. To query this function, you must have the sysadmin or monadmin permission.

  Return type: record

• DBE_PERF.get_global_transactions_running_xacts()

  Description: Displays information about running transactions on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_transactions_running_xacts()

  Description: Collects statistics of information about running transactions on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_transactions_prepared_xacts()

  Description: Displays information about transactions that are currently prepared for two-phase commit on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_transactions_prepared_xacts()

  Description: Collects statistics information about transactions that are currently prepared for two-phase commit on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_statement()

  Description: Displays the status information of the historically-executed statements on each node. To query this function, you must have the sysadmin or monitoradmin permission.

  Return type: record

• DBE_PERF.get_global_statement_count()

  Description: Displays the number of SELECT, UPDATE, INSERT, and DELETE statements and response time information (TOTAL, AVG, MIN, and MAX) on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_config_settings()

  Description: Displays GUC parameter configuration information on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_wait_events()

  Description: Displays the wait event status information on each node. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_statement_responsetime_percentile()

  Description: Obtains the response time distribution for 80% and 95% SQL statements of MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_summary_user_login()

  Description: Collects statistics about number of user login and logout times on each node in MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.get_global_record_reset_time()

  Description: Displays the statistics about reset (restart, primary/standby switchover, and database deletion) time of MogDB. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.track_memory_context(context_list text)

  Description: Sets the memory context whose memory application details need to be collected. The input parameter is the memory context names, which are separated by commas (,), for example, ThreadTopMemoryContext, SessionCacheMemoryContext. Note that the memory context names are context-sensitive. In addition, the length of a single memory context is 63, and the excess part is truncated. The maximum number of memory contexts that can be collected at a time is 16. If the number of memory contexts exceeds 16, the setting fails. Each time this function is called, the previous statistics result is cleared. When the input parameter is set to "", the statistics function is disabled. Only the initial user (super user) or a user with the monadminpermission can execute this function.

  Return type: Boolean

• DBE_PERF.track_memory_context_detail()

  Description: Obtains the memory application details of the memory context specified by the DBE_PERF.track_memory_context function. For details, see the DBE_PERF.track_memory_context_detail view. Only the initial user (super user) or a user with the monadminpermission can execute this function.

  Return type: record

• pg_stat_get_mem_mbytes_reserved(tid)

  Description: Collects statistics on variables related to resource management, which is used only for fault locating.

  Parameter: thread ID

  Return type: text

• gs_wlm_user_resource_info(name text)

  Description: Queries a user's resource quota and resource usage.

  Return type: record

• pg_stat_get_file_stat()

  Description: Rrecords statistics about data file I/Os to indicate I/O performance and detect performance problems such as abnormal I/O operations.

  Return type: record

• pg_stat_get_redo_stat()

  Description: Displays statistics on the replay of session thread logs.

  Return type: record

• pg_stat_get_status(int8)

  Description: Tests the block waiting status about the backend thread and auxiliary thread of the current instance.

  Return type: record

• get_local_rel_iostat()

  Description: Queries the accumulated I/O status of data files on the current node.

  Return type: record

• DBE_PERF.get_global_rel_iostat()

  Description: Displays statistics about data file I/Os on all nodes. To query this function, you must have the sysadmin permission.

  Return type: record

• DBE_PERF.global_threadpool_status()

  Description: Displays the status of worker threads and sessions in thread pools on all nodes. For details about the columns returned by the function, see GLOBAL_THREADPOOL_STATUS.

  Return type: record

• remote_bgwriter_stat()

  Description: Displays the information about pages flushed by the bgwriter threads of all instances in the database, number of pages in the candidate buffer chain, and buffer elimination information (except for the local node and not available on the DN).

  Return type: record

• pv_os_run_info

  Description: Displays the running status of the current OS. For details about the columns, see GS_OS_RUN_INFO.

  Parameter: nan

  Return type: SETOF record

• pv_session_stat

  Description: Collects session status information by session thread or AutoVacuum thread. For details about the columns, see GS_SESSION_STAT.

  Parameter: nan

  Return type: SETOF record

• pv_session_time

  Description: Collects statistics on the running time of session threads and the time consumed in each execution phase. For details about the columns, see GS_SESSION_TIME.

  Parameter: nan

  Return type: SETOF record

• pg_stat_get_db_temp_bytes

  Description: Collects statistics on the total amount of data written to temporary files through database query. All temporary files are counted, regardless of why the temporary file was created, and regardless of the log_temp_files setting.

  Parameter: oid

  Return type: bigint

• pg_stat_get_db_temp_files

  Description: Queries the number of temporary files created in the 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.

  Parameter: oid

  Return type: bigint

• remote_candidate_stat()

  Description: Displays the checkpoint information and log flushing information about all instances in the database (except the current node). Centralized systems are not supported.

  Return type: record

• dbe_perf.gs_stat_activity_timeout(int)

  Description: Obtains information about query jobs whose execution time exceeds the timeout threshold on the current node. The correct result can be returned only when the GUC parameter track_activities is set to on. The timeout threshold ranges from 0 to 2147483.

  Return type: SETOF record

  Name	Type	Description
  database	name	Name of the database to which a user session is connected
  pid	bigint	Backend thread ID
  sessionid	bigint	Session ID
  usesysid	oid	OID of the user logged in to the backend
  application_name	text	Name of the application connected to the backend
  query	text	Query that is being executed on the backend
  xact_start	timestamptz	Time when the current transaction is started
  query_start	timestamptz	Time when the current query starts
  query_id	bigint	Query statement ID

• gs_wlm_user_resource_info(name text)

  Description: Queries a user's resource quota and resource usage. Common users can query only their own information. Administrators can query information about all users.

  Return type: record

• create_wlm_instance_statistics_info

  Description: Saves the historical monitoring data of the current instance persistently.

  Parameter: nan

  Return type: integer

• gs_session_memory

  Description: Collects statistics about memory usage at the session level in the unit of MB, including all the memory allocated to Postgres and Stream threads on DNs for tasks currently executed by users.

  NOTE: If enable_memory_limit is set to off, this function cannot be used.

  Return type: record

  Table 8 Return value description

  Name	Type	Description
  sessid	text	Thread start time and ID
  init_mem	integer	Memory allocated to the currently executed jobs before they enter the executor, in MB
  used_mem	integer	Memory allocated to the currently executed jobs, in MB
  peak_mem	integer	Peak memory allocated to the currently executed jobs, in MB

• gs_wlm_persistent_user_resource_info()

  Description: Archives all user resource usage statistics to the gs_wlm_user_resource_history system catalog. To query this function, you must have the sysadmin permission.

  Return type: record

• create_wlm_operator_info(int flag)

  Description: Clears top SQL operator-level statistics recorded in the current memory. If the input parameter is greater than 0, the information is archived to gs_wlm_operator_info and gs_wlm_ec_operator_info. Otherwise, the information is not archived. Only users with the sysadmin permission can execute this function.

  Return type: int

• GS_ALL_NODEGROUP_CONTROL_GROUP_INFO(text)

  Description: Provides Cgroup information for all logical database instances. Before invoking this function, you need to specify the name of a logical database instance to be queried. For example, to query the Cgroup information for the installation logical database instance, run the following command:

  SELECT * FROM GS_ALL_NODEGROUP_CONTROL_GROUP_INFO('installation')

  Return type: record

  The following table describes return columns.

  Name	Type	Description
  name	text	Cgroup name.
  type	text	Cgroup type.
  gid	bigint	Cgroup ID.
  classgid	bigint	ID of the Class cgroup where a Workload cgroup belongs.
  class	text	Class cgroup.
  workload	text	Workload cgroup.
  shares	bigint	CPU quota allocated to the cgroup.
  limits	bigint	Limit of CPUs allocated to a cgroup.
  wdlevel	bigint	Workload cgroup level.
  cpucores	text	Usage of CPU cores in a cgroup.

• gs_total_nodegroup_memory_detail

  Description: Returns information about the memory used by the current logical database, in MB.

  Return type: SETOF record