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GS_WLM_SESSION_HISTORY

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

GS_WLM_SESSION_HISTORY displays load management information about a completed job 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 the sysadmin or monitor admin permission can query this view.

The data in GaussDB is deleted every 3 minutes. If the GUC parameter enable_resource_record is set to on, the records in the view are dumped to the GS_WLM_SESSION_QUERY_INFO_ALL system catalog every 3 minutes and deleted from the view. If enable_resource_record is set to off, the records are retained in the view for 3 minutes and then deleted.

Table 1 GS_WLM_SESSION_HISTORY columns

Name

Type

Description

datid

oid

OID of the database that the backend is connected to

dbname

text

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

text

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, either the client is connected via a Unix socket on the server machine 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 only be non-null 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.

block_time

bigint

Duration (in ms) that a statement is blocked before being executed, including the statement parsing and optimization duration

start_time

timestamp with time zone

Time when the statement starts to run

finish_time

timestamp with time zone

Time when the statement execution ends

duration

bigint

Execution time of the statement, in ms

estimate_total_time

bigint

Estimated execution time of the statement, in ms

status

text

Final statement execution status, which can be finished (normal) or aborted (abnormal).

abort_info

text

Exception information displayed if the final statement execution status is aborted

resource_pool

text

Resource pool used by the user

control_group

text

Cgroup used by the statement

estimate_memory

integer

Estimated memory size of the statement.

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 DN

spill_info

text

Statement spill information on all DNs.
  • None: No data is spilled to disks.
  • All: Data is 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, 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 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 DNs

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 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.)

cpu_top1_node_name

text

Name of the node with the highest CPU usage

cpu_top2_node_name

text

Name of the node with the second highest CPU usage

cpu_top3_node_name

text

Name of the node with the third highest CPU usage

cpu_top4_node_name

text

Name of the node with the fourth highest CPU usage

cpu_top5_node_name

text

Name of the node with the fifth highest CPU usage

mem_top1_node_name

text

Name of the node with the highest memory usage

mem_top2_node_name

text

Name of the node with the second highest CPU usage

mem_top3_node_name

text

Name of the node with the third highest CPU usage

mem_top4_node_name

text

Name of the node with the fourth highest CPU usage

mem_top5_node_name

text

Name of the node with the fifth highest CPU usage

cpu_top1_value

bigint

CPU usage

cpu_top2_value

bigint

CPU usage

cpu_top3_value

bigint

CPU usage

cpu_top4_value

bigint

CPU usage

cpu_top5_value

bigint

CPU usage

mem_top1_value

bigint

Memory usage

mem_top2_value

bigint

Memory usage

mem_top3_value

bigint

Memory usage

mem_top4_value

bigint

Memory usage

mem_top5_value

bigint

Memory usage

top_mem_dn

text

Top N memory usage

top_cpu_dn

text

Top N CPU usage

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