STATEMENT_HISTORY

Displays information about statements executed on the current node. To query this system catalog, you must have the sysadmin permission. The result can be queried only in the system database but cannot be queried in the user database.

The constraints on the query of this system catalog are as follows:

Data must be queried in the Postgres database. No data exists in other databases.
This system catalog is controlled by track_stmt_stat_level. The default value is OFF,L0, where the first part controls full SQL statements, and the second part controls slow SQL statements. For details about the record level of each field, see the following table. To ensure system performance, you are advised to use the SET statement to change the value of this parameter so that the parameter takes effect only for the current session.
For slow SQL statements, if the value of track_stmt_stat_level is not OFF and the SQL execution time exceeds the value of log_min_duration_statement, the SQL statement is recorded as a slow SQL statement.

**Table 1** STATEMENT_HISTORY columns
Name	Type	Description	Record Level
db_name	name	Database name.	L0
schema_name	name	Schema name.	L0
origin_node	integer	Node name.	L0
user_name	name	Username.	L0
application_name	text	Name of the application that sends a request.	L0
client_addr	text	IP address of the client that sends a request.	L0
client_port	integer	Port number of the client that sends a request.	L0
unique_query_id	bigint	ID of the normalized SQL statement.	L0
debug_query_id	bigint	ID of the unique SQL statement. Some statements are not unique. For example, the value of debug_query_id in the Parse packet, DCL statements, and TCL statements is 0.	L0
query	text	Normalized SQL (available only on CNs). When track_stmt_parameter is enabled, complete SQL statements are displayed.	L0
start_time	timestamp with time zone	Time when a statement starts.	L0
finish_time	timestamp with time zone	Time when a statement ends.	L0
slow_sql_threshold	bigint	Standard for slow SQL statement execution.	L0
transaction_id	bigint	Transaction ID.	L0
thread_id	bigint	ID of an execution thread.	L0
session_id	bigint	Session ID of a user.	L0
n_soft_parse	bigint	Number of soft parsing times. The value of n_soft_parse plus the value of n_hard_parse may be greater than the value of n_calls because the number of subqueries is not counted in the value of n_calls.	L0
n_hard_parse	bigint	Number of hard parsing times. The value of n_soft_parse plus the value of n_hard_parse may be greater than the value of n_calls because the number of subqueries is not counted in the value of n_calls.	L0
query_plan	text	Statement execution plan.	L1(Full SQL) L0(Slow SQL)
n_returned_rows	bigint	Number of rows in the result set returned by the SELECT statement.	L0
n_tuples_fetched	bigint	Number of rows randomly scanned.	L0
n_tuples_returned	bigint	Number of rows sequentially scanned.	L0
n_tuples_inserted	bigint	Number of rows inserted.	L0
n_tuples_updated	bigint	Number of rows updated.	L0
n_tuples_deleted	bigint	Number of rows deleted.	L0
n_blocks_fetched	bigint	Number of buffer block access times.	L0
n_blocks_hit	bigint	Number of buffer block hits.	L0
db_time	bigint	Valid DB time, which is accumulated if multiple threads are involved (unit: μs).	L0
cpu_time	bigint	CPU time (unit: μs).	L0
execution_time	bigint	Execution time in the executor (unit: μs).	L0
parse_time	bigint	SQL parsing time (unit: μs).	L0
plan_time	bigint	SQL plan generation time (unit: μs).	L0
rewrite_time	bigint	SQL rewriting time (unit: μs).	L0
pl_execution_time	bigint	Execution time of PL/pgSQL (unit: μs).	L0
pl_compilation_time	bigint	Compilation time of PL/pgSQL (unit: μs).	L0
data_io_time	bigint	I/O time (unit: μs).	L0
net_send_info	text	Network status of messages sent through a physical connection, including the time (unit: μs), number of calls, and throughput (unit: byte). In a distributed database, CNs communicate with each other, CNs communicate with the client, and CNs communicate with DNs through physical connections. This column can be used to analyze the network overhead of SQL statements in a distributed system. Example: {"time":xxx, "n_calls":xxx, "size":xxx}.	L0
net_recv_info	text	Network status of messages received through a physical connection, including the time (unit: μs), number of calls, and throughput (unit: byte). In a distributed database, CNs communicate with each other, CNs communicate with the client, and CNs communicate with DNs through physical connections. This column can be used to analyze the network overhead of SQL statements in a distributed system. Example: {"time":xxx, "n_calls":xxx, "size":xxx}.	L0
net_stream_send_info	text	Network status of messages sent through a logical connection, including the time (unit: μs), number of calls, and throughput (unit: byte). In a distributed database, DNs of different shards communicate with each other through logical connections. This column can be used to analyze the network overhead of SQL statements in a distributed system. Example: {"time":xxx, "n_calls":xxx, "size":xxx}.	L0
net_stream_recv_info	text	Network status of messages received through a logical connection, including the time (unit: μs), number of calls, and throughput (unit: byte). In a distributed database, DNs of different shards communicate with each other through logical connections. This column can be used to analyze the network overhead of SQL statements in a distributed system. Example: {"time":xxx, "n_calls":xxx, "size":xxx}.	L0
lock_count	bigint	Number of locks.	L0
lock_time	bigint	Time required for locking.	L1
lock_wait_count	bigint	Number of lock waits.	L0
lock_wait_time	bigint	Time required for lock waiting.	L1
lock_max_count	bigint	Maximum number of locks.	L0
lwlock_count	bigint	Number of lightweight locks (reserved).	L0
lwlock_wait_count	bigint	Number of lightweight lock waits.	L0
lwlock_time	bigint	Time required for lightweight locking (reserved).	L1
lwlock_wait_time	bigint	Time required for lightweight lock waiting.	L1
details	bytea	List of wait events and statement lock events. When the value of the record level is greater than or equal to L0, the list of wait events starts to be recorded. It displays statistics about wait events on the current node. For details about key events in the kernel, see Table 2, Table 3, Table 4, and Table 5. You can also view the list of all events in the system in the wait_event_info view. For details about the impact of each transaction lock on services, see LOCK. When the value of track_stmt_stat_level is L2, the list of statement lock events is recorded. The list records events in chronological order. The number of records is affected by the value of the track_stmt_details_size parameter. This field is in binary format and needs to be read by using the parsing function pg_catalog.statement_detail_decode. For details, see Table 12. Events include: Start locking. Complete locking. Start lock waiting. Complete lock waiting. Start unlocking. Complete unlocking. Start lightweight lock waiting. Complete lightweight lock waiting.	L0/L2
is_slow_sql	Boolean	Specifies whether the SQL statement is a slow SQL statement. t (true): yes f (false): no	L0
trace_id	text	Driver-specific trace ID, which is associated with an application request.	L0
advise	text	Risk information that may cause the SQL statement to be a slow SQL statement.	L0
parent_unique_sql_id	bigint	Normalized SQL ID of the outer SQL statement. For statements executed in a stored procedure, the value is the normalized SQL ID of the statement that invokes the stored procedure. For statements outside the stored procedure, the value is 0.	L0
finish_status	text	Statement completion status. normal (default) cancelled: cancellation or termination.	L0

The record level of the query_plan column is L1 for full SQL statements and L0 for slow SQL statements.
For the db_time time model, the time statistics of each dimension in statement_history meet the requirement that db_time is greater than or equal to max(cpu_time, parse_time, plan_time, rewrite_time, data_io_time, net_send_info.time, net_recv_info.time, net_stream_send_info.time, net_stream_recv_info.time).
For the db_time time model formula, the following dimensions are not included in the statistical accuracy scope:
1. execution_time
2. pl_execution_time
3. pl_compilation_time
The maximum nesting depth of wait events is 20. If the nesting depth exceeds 20, a new wait event overwrites the last wait event.