PGXC_WLM_SESSION_STATISTICS

PGXC_WLM_SESSION_STATISTICS displays load management information about jobs that are being executed on CNs.

**Table 1** **PGXC_WLM_SESSION_STATISTICS** columns
Name	Type	Description
datid	oid	OID of the database connected to the backend.
dbname	name	Name of the database connected to the backend.
schemaname	text	Schema name.
nodename	text	Name of the CN where the statement is executed.
username	name	Username used for connecting to the backend.
application_name	text	Name of the application connected to the backend.
client_addr	inet	IP address of the client connected to the backend. If this column is null, it indicates either that the client is connected via a Unix socket on the server machine or that 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 only be non-null for IP connections, and only when log_hostname is enabled.
client_port	integer	TCP port number used by the client to communicate with the backend. If a Unix socket is used, it is –1.
query_band	text	Job type, which can be set through the GUC parameter query_band and is null string by default.
pid	bigint	ID of the backend thread.
block_time	bigint	Block time before the statement is executed. The unit is ms.
start_time	timestamp with time zone	Start time of statement execution.
duration	bigint	Time that the statement has been executed. The unit is ms.
estimate_total_time	bigint	Estimated time of statement execution. The unit is ms.
estimate_left_time	bigint	Estimated remaining time of statement execution. The unit is ms.
enqueue	text	Workload management resource status.
resource_pool	name	Resource pool used by the user.
control_group	text	Cgroup used by the statement.
estimate_memory	integer	Estimated memory used by the statement. The unit is MB.
min_peak_memory	integer	Minimum memory peak of a statement across all DNs. The unit is MB.
max_peak_memory	integer	Maximum memory peak of a statement across all DNs. The unit is MB.
average_peak_memory	integer	Average memory usage during statement execution. The unit is MB.
memory_skew_percent	integer	Memory usage skew of a statement among DNs.
spill_info	text	Statement spill information on all DNs. None: The statement has not been spilled to disks on any DNs. All: The statement has been spilled to disks on all DNs. [a:b]: The statement has been spilled to disks on a of b DNs.
min_spill_size	integer	Minimum spilled data among all DNs when a spill occurs. The unit is MB. Default value: 0.
max_spill_size	integer	Maximum spilled data among all DNs when a spill occurs. The unit is MB. Default value: 0.
average_spill_size	integer	Average spilled data among all DNs when a spill occurs. The unit is MB. Default value: 0.
spill_skew_percent	integer	DN spill skew when a spill occurs.
min_dn_time	bigint	Minimum execution time of a statement across all DNs. The unit is ms.
max_dn_time	bigint	Maximum execution time of a statement across all DNs. The unit is ms.
average_dn_time	bigint	Average execution time of a statement across all DNs. The unit is ms.
dntime_skew_percent	integer	Execution time skew of a statement among DNs.
min_cpu_time	bigint	Minimum CPU time of a statement across all DNs. The unit is ms.
max_cpu_time	bigint	Maximum CPU time of a statement across all DNs. The unit is ms.
total_cpu_time	bigint	Total CPU time of a statement across all DNs. The unit is ms.
cpu_skew_percent	integer	CPU time skew of a statement among DNs.
min_peak_iops	integer	Minimum I/O peak of a statement on all DNs (times/s in column-store tables and 10,000 times/s in row-store tables). This function is not enabled in clusters of version 8.1.3. Therefore, you are not advised to refer to this column to analyze memory problems.
max_peak_iops	integer	Maximum I/O peak of a statement on all DNs (times/s in column-store tables and 10,000 times/s in row-store tables). This function is not enabled in clusters of version 8.1.3. Therefore, you are not advised to refer to this column to analyze memory problems.
average_peak_iops	integer	Average I/O peak of a statement on all DNs (times/s in column-store tables and 10,000 times/s in row-store tables). This function is not enabled in clusters of version 8.1.3. Therefore, you are not advised to refer to this column to analyze memory problems.
iops_skew_percent	integer	I/O skew across DNs. This function is not enabled in clusters of version 8.1.3. You are not advised to analyze memory problems by referring to this column.
warning	text	Warning. The following warnings and warnings related to SQL self-diagnosis tuning are displayed: Spill file size large than 256MB Broadcast size large than 100MB Early spill Spill times is greater than 3 Spill on memory adaptive Hash table conflict
queryid	bigint	Internal query ID used for statement execution.
query	text	Statement that is being executed.
query_plan	text	Execution plan of a statement.
node_group	text	Logical cluster of the user running the statement.