Updated on 2024-10-14 GMT+08:00

GS_WLM_SESSION_STATISTICS

GS_WLM_SESSION_STATISTICS displays load management information about jobs being executed by the current user on the current CN. (The current feature is a lab feature. Contact Huawei technical support before using it.) Only the user with sysadmin permission can query this view.

Table 1 GS_WLM_SESSION_STATISTICS columns

Name

Type

Description

datid

oid

OID of the database that the backend is connected to

dbname

name

Name of the database that the backend is connected to

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 that is connected to the backend

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 when log_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)

query_band

text

Job type, which is specified by the GUC parameter query_band. The default value is a null string.

pid

bigint

Backend thread ID

sessionid

bigint

Session ID

global_sessionid

text

Global session ID

block_time

bigint

Block time before the statement is run, in ms

start_time

timestamp with time zone

Time when the statement starts to run

duration

bigint

Duration that a statement has been executed, in ms

estimate_total_time

bigint

Estimated execution time of the statement, in ms

estimate_left_time

bigint

Estimated remaining execution time of the statement, in ms

enqueue

text

Resource status in workload management. (The current feature is a lab feature. Contact Huawei technical support before using it.)

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, in MB. This parameter takes effect only if enable_dynamic_workload is set to on.

min_peak_memory

integer

Minimum memory peak of the statement across all DNs, in MB

max_peak_memory

integer

Maximum memory peak of the statement across all DNs, in MB

average_peak_memory

integer

Average memory usage during statement execution, in MB

memory_skew_percent

integer

Memory usage skew of the statement among each DNs

spill_info

text

Statement spill information on all DNs:
  • None: No data is spilled to disks on all DNs.
  • All: Data is spilled to disks on all DNs.
  • [a:b]: The statement has been spilled to disks on a of b DN.

min_spill_size

integer

Minimum spilled data among all DNs when a spill occurs, in MB (default value: 0)

max_spill_size

integer

Maximum spilled data among all DNs when a spill occurs, in MB (default value: 0)

average_spill_size

integer

Average spilled data among all DNs when a spill occurs, in MB (default value: 0)

spill_skew_percent

integer

DN spill skew when a spill occurs

min_dn_time

bigint

Minimum execution time of the statement across all DNs, in ms

max_dn_time

bigint

Maximum execution time of the statement across all DNs, in ms

average_dn_time

bigint

Average execution time of the statement across all DNs, in ms

dntime_skew_percent

integer

Execution time skew of the statement among each DN

min_cpu_time

bigint

Minimum CPU time of the statement across all DNs, in ms

max_cpu_time

bigint

Maximum CPU time of the statement across all DNs, in ms

total_cpu_time

bigint

Total CPU time of the statement across all DNs, in ms

cpu_skew_percent

integer

CPU time skew of the statement among each DNs

min_peak_iops

integer

Minimum IOPS peak of the statement across all DNs. It is counted by ones in a column-store table and by ten thousands in a row-store table.

max_peak_iops

integer

Maximum IOPS peak of the statement across all DNs. It is counted by ones in a column-store table and by ten thousands in a row-store table.

average_peak_iops

integer

Average IOPS peak of the statement across all DNs. It is counted by ones in a column-store table and by ten thousands in a row-store table.

iops_skew_percent

integer

I/O skew across DN

warning

text

Warning. The following warnings and warnings related to Optimizing SQL Self-Diagnosis 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 being executed

query_plan

text

Execution plan of the statement

node_group

text

Logical cluster of the user running the statement. (The current feature is a lab feature. Contact Huawei technical support before using it.)

top_cpu_dn

text

Top N CPU usage

top_mem_dn

text

Top N memory usage