STATEMENT

STATEMENT obtains information about execution statements (unique SQL statements) on the current node. To query this view, you must have the sysadmin permission. You can view all statistics about unique SQL statements received by the primary database node and other database nodes, whereas you can view only the statistics about unique SQL statements executed on other database nodes.

Table 1 STATEMENT columns

Name	Type	Description
node_name	name	Database process name
node_id	integer	Node ID (node_id in pgxc_node)
user_name	name	Username
user_id	oid	OID of the user
unique_sql_id	bigint	ID of the unique SQL statement
query	text	Unique SQL statement Note: The length is controlled by track_activity_query_size.
n_calls	bigint	Number of calls
min_elapse_time	bigint	Minimum execution time of the SQL statement in the kernel (unit: μs)
max_elapse_time	bigint	Maximum execution time of the SQL statement in the kernel (unit: μs)
total_elapse_time	bigint	Total execution time of the SQL statement in the kernel (unit: μs)
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
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.
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 can be used to analyze the network overhead of SQL in a distributed system. This column is not supported in a standalone mode. Example: {"time":xxx, "n_calls":xxx, "size":xxx}.
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 can be used to analyze the network overhead of SQL in a distributed system. This column is not supported in a standalone mode. Example: {"time":xxx, "n_calls":xxx, "size":xxx}.
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 can be used to analyze the network overhead of SQL in a distributed system. This column is not supported in a standalone mode. Example: {"time":xxx, "n_calls":xxx, "size":xxx}.
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 can be used to analyze the network overhead of SQL in a distributed system. This column is not supported in a standalone mode. Example: {"time":xxx, "n_calls":xxx, "size":xxx}.
sort_count	bigint	Sorting count
sort_time	bigint	Sorting duration (unit: μs)
sort_mem_used	bigint	Size of work memory used during sorting (unit: KB)
sort_spill_count	bigint	Count of file writing when data is flushed to disks during sorting
sort_spill_size	bigint	File size used when data is flushed to disks during sorting (unit: KB)
hash_count	bigint	Hashing count
hash_time	bigint	Hashing duration (unit: μs)
hash_mem_used	bigint	Size of work memory used during hashing (unit: KB)
hash_spill_count	bigint	Count of file writing when data is flushed to disks during hashing
hash_spill_size	bigint	File size used when data is flushed to disks during hashing (unit: KB)

This feature corresponds to the system function get_instr_unique_sql, which is used to store status records of SQL statements that run after the database is started.

General usage syntax:

MogDB=# select * from dbe_perf.statement;

It is mainly controlled by the following parameters:

enable_resource_track: tracks resource usage at runtime.
instr_unique_sql_count: indicates the total number of SQL statements that can be recorded in the memory. Each time this parameter is modified, all unique SQL statements in the memory are reset.
instr_unique_sql_track_type: indicates the unique SQL tracing mode. The value can be top or all. Currently, only top is supported. For stored procedures, only the outermost call is recorded.
enable_auto_clean_unique_sql: indicates whether to enable the auto cleanup mechanism of unique SQL. It can automatically clean up 10% of the records randomly when the upper limit is reached. If it is not enabled, error logs will be recorded and SQL related content will not be recorded in memory.

For details, see GUC parameter: Query.

Issue

STATEMENT

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