Help Center/ GaussDB/ Developer Guide(Centralized_V2.0-2.x)/ Schemas/ DBE_PERF Schema/ Query/ STATEMENT_HISTORY
Updated on 2025-08-19 GMT+08:00
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STATEMENT_HISTORY

Displays information about statements executed on the current node. To query a view, you must have the SYSADMIN or MONADMIN permission. The result can be queried only in the system database but cannot be queried in the user database.

Table 1 STATEMENT_HISTORY columns

Name

Type

Description

dbname

name

Database name.

schemaname

name

Schema name.

origin_node

integer

Node name.

user_name

name

Username.

application_name

text

Name of the application that sends a request.

client_addr

text

IP address of the client that sends a request.

client_port

integer

Port number of the client that sends a request.

unique_query_id

bigint

ID of the normalized SQL statement.

debug_query_id

bigint

ID of the unique SQL statement.

query

text

Normalized SQL statement.

start_time

timestamp with time zone

Time when a statement starts.

finish_time

timestamp with time zone

Time when a statement ends.

slow_sql_threshold

bigint

Standard for slow SQL statement execution.

transaction_id

bigint

Transaction ID.

thread_id

bigint

ID of an execution thread.

session_id

bigint

Session ID of a user.

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.

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.

query_plan

text

Statement execution plan.

n_returned_rows

bigint

Number of rows in the result set returned by the SELECT statement.

n_tuples_fetched

bigint

Number of rows randomly scanned.

n_tuples_returned

bigint

Number of rows sequentially scanned.

n_tuples_inserted

bigint

Number of rows inserted.

n_tuples_updated

bigint

Number of rows updated.

n_tuples_deleted

bigint

Number of rows deleted.

n_blocks_fetched

bigint

Number of buffer block access times.

n_blocks_hit

bigint

Number of buffer block hits.

db_time

bigint

Valid DB time, which is accumulated if multiple threads are involved (unit: μs).

cpu_time

bigint

CPU time (unit: μs).

execution_time

bigint

Execution time in the executor (unit: μs).

parse_time

bigint

SQL parsing time (unit: μs).

plan_time

bigint

SQL plan generation time (unit: μs).

rewrite_time

bigint

SQL rewriting time (unit: μs).

pl_execution_time

bigint

Execution time of PL/pgSQL (unit: μs).

pl_compilation_time

bigint

Compilation time of PL/pgSQL (unit: μs).

data_io_time

bigint

I/O time (unit: μs).

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). This column is not supported in standalone mode.

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). This column is not supported in standalone mode.

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). This column is not supported in standalone mode.

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). This column is not supported in standalone mode.

lock_count

bigint

Number of locks.

lock_time

bigint

Time required for locking.

lock_wait_count

bigint

Number of lock waits.

lock_wait_time

bigint

Time required for lock waiting.

lock_max_count

bigint

Maximum number of locks.

lwlock_count

bigint

Number of lightweight locks (reserved).

lwlock_wait_count

bigint

Number of lightweight lock waits.

lwlock_time

bigint

Time required for lightweight locking (reserved).

lwlock_wait_time

bigint

Time required for lightweight locking.

details

bytea

List of statement lock events, which are recorded in time sequence. The number of records is affected by the track_stmt_details_size parameter.

Events include:

  • Start locking.
  • Complete locking.
  • Start lock waiting.
  • Complete lock waiting.
  • Start unlocking.
  • Complete unlocking.
  • Start lightweight lock waiting.
  • Complete lightweight lock waiting.

is_slow_sql

Boolean

Specifies whether the SQL statement is a slow SQL statement.

trace_id

text

Driver-specific trace ID, which is associated with an application request.

advise

text

Risks which may cause slow SQL statements. (Multiple risks may exist at the same time.)

  • Cast Function Cause Index Miss. : Index matching may fail due to implicit conversion.
  • Limit too much rows. : The SQL statement execution may slow down due to a large limit value.
  • Proleakproof of function is false. : The proleakproof of the function is set to false. In this case, the function does not use statistics when generating a plan due to data leakage risks. As a result, the accuracy of the generated plan is affected and the SQL statement execution may slow down.
Parent topic: Query